2007-01-16 03:44:45 +01:00
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<html>
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<head>
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<meta http-equiv="Content-type" content="text/html; charset=utf8">
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<title>Flawfinder Results</title>
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<meta name="author" content="David A. Wheeler">
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<meta name="keywords" lang="en" content="flawfinder results, security scan">
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</head>
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<body>
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<h1>Flawfinder Results</h1>
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Here are the security scan results from
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2014-08-09 19:32:37 +02:00
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<a href="http://www.dwheeler.com/flawfinder">Flawfinder version 1.32</a>,
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2014-07-19 19:00:58 +02:00
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(C) 2001-2014 <a href="http://www.dwheeler.com">David A. Wheeler</a>.
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2014-09-01 21:14:55 +02:00
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Number of rules (primarily dangerous function names) in C/C++ ruleset: 209
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2007-01-16 03:44:45 +01:00
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<p>
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Examining test.c <br>
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Examining test2.c <br>
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2014-07-19 22:42:14 +02:00
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<h2>Final Results</h2>
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2007-01-16 03:44:45 +01:00
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<ul>
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<li>test.c:32: <b> [5] </b> (buffer) <i> gets:
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2014-07-19 22:42:14 +02:00
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Does not check for buffer overflows (<a
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2014-07-23 05:01:18 +02:00
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href="http://cwe.mitre.org/data/definitions/120.html">CWE-120</a>, <a
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href="http://cwe.mitre.org/data/definitions/20.html">CWE-20</a>). Use
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2014-07-19 22:42:14 +02:00
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fgets() instead. </i>
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2007-01-16 03:44:45 +01:00
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<pre>
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gets(f);
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</pre>
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<li>test.c:56: <b> [5] </b> (buffer) <i> strncat:
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2014-07-19 22:42:14 +02:00
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Easily used incorrectly (e.g., incorrectly computing the correct maximum
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2014-09-01 21:14:55 +02:00
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size to add) [MS-banned] (<a
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2014-07-19 22:42:14 +02:00
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href="http://cwe.mitre.org/data/definitions/120.html">CWE-120</a>).
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2014-09-01 21:14:55 +02:00
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Consider strcat_s, strlcat, snprintf, or automatically resizing strings.
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Risk is high; the length parameter appears to be a constant, instead of
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computing the number of characters left. </i>
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2007-01-16 03:44:45 +01:00
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<pre>
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strncat(d,s,sizeof(d)); /* Misuse - this should be flagged as riskier. */
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</pre>
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<li>test.c:57: <b> [5] </b> (buffer) <i> _tcsncat:
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2014-07-19 22:42:14 +02:00
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Easily used incorrectly (e.g., incorrectly computing the correct maximum
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2014-09-01 21:14:55 +02:00
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size to add) [MS-banned] (<a
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2014-07-19 22:42:14 +02:00
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href="http://cwe.mitre.org/data/definitions/120.html">CWE-120</a>).
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Consider strcat_s, strlcat, or automatically resizing strings. Risk is
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high; the length parameter appears to be a constant, instead of computing
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the number of characters left. </i>
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2007-01-16 03:44:45 +01:00
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<pre>
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_tcsncat(d,s,sizeof(d)); /* Misuse - flag as riskier */
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</pre>
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<li>test.c:60: <b> [5] </b> (buffer) <i> MultiByteToWideChar:
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2014-07-19 22:42:14 +02:00
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Requires maximum length in CHARACTERS, not bytes (<a
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href="http://cwe.mitre.org/data/definitions/120.html">CWE-120</a>). Risk is
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high, it appears that the size is given as bytes, but the function requires
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size as characters. </i>
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2007-01-16 03:44:45 +01:00
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<pre>
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MultiByteToWideChar(CP_ACP,0,szName,-1,wszUserName,sizeof(wszUserName));
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</pre>
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<li>test.c:62: <b> [5] </b> (buffer) <i> MultiByteToWideChar:
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2014-07-19 22:42:14 +02:00
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Requires maximum length in CHARACTERS, not bytes (<a
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href="http://cwe.mitre.org/data/definitions/120.html">CWE-120</a>). Risk is
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high, it appears that the size is given as bytes, but the function requires
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size as characters. </i>
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2007-01-16 03:44:45 +01:00
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<pre>
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MultiByteToWideChar(CP_ACP,0,szName,-1,wszUserName,sizeof wszUserName);
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</pre>
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<li>test.c:73: <b> [5] </b> (misc) <i> SetSecurityDescriptorDacl:
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Never create NULL ACLs; an attacker can set it to Everyone (Deny All
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2014-07-19 22:42:14 +02:00
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Access), which would even forbid administrator access (<a
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href="http://cwe.mitre.org/data/definitions/732.html">CWE-732</a>). </i>
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2007-01-16 03:44:45 +01:00
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<pre>
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SetSecurityDescriptorDacl(&sd,TRUE,NULL,FALSE);
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</pre>
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<li>test.c:73: <b> [5] </b> (misc) <i> SetSecurityDescriptorDacl:
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Never create NULL ACLs; an attacker can set it to Everyone (Deny All
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2014-07-19 22:42:14 +02:00
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Access), which would even forbid administrator access (<a
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href="http://cwe.mitre.org/data/definitions/732.html">CWE-732</a>). </i>
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2007-01-16 03:44:45 +01:00
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<pre>
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SetSecurityDescriptorDacl(&sd,TRUE,NULL,FALSE);
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</pre>
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<li>test.c:17: <b> [4] </b> (buffer) <i> strcpy:
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2014-08-09 19:32:37 +02:00
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Does not check for buffer overflows when copying to destination [MS-banned]
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(<a href="http://cwe.mitre.org/data/definitions/120.html">CWE-120</a>).
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2014-09-01 21:14:55 +02:00
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Consider using snprintf, strcpy_s, or strlcpy (warning: strncpy easily
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2014-07-19 22:42:14 +02:00
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misused). </i>
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2007-01-16 03:44:45 +01:00
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<pre>
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strcpy(b, a);
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</pre>
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<li>test.c:20: <b> [4] </b> (buffer) <i> sprintf:
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2014-07-19 22:42:14 +02:00
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Does not check for buffer overflows (<a
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href="http://cwe.mitre.org/data/definitions/120.html">CWE-120</a>). Use
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sprintf_s, snprintf, or vsnprintf. </i>
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2007-01-16 03:44:45 +01:00
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<pre>
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sprintf(s, "hello %s", bug);
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</pre>
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<li>test.c:21: <b> [4] </b> (buffer) <i> sprintf:
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2014-07-19 22:42:14 +02:00
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Does not check for buffer overflows (<a
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href="http://cwe.mitre.org/data/definitions/120.html">CWE-120</a>). Use
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sprintf_s, snprintf, or vsnprintf. </i>
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2007-01-16 03:44:45 +01:00
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<pre>
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sprintf(s, gettext("hello %s"), bug);
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</pre>
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<li>test.c:22: <b> [4] </b> (format) <i> sprintf:
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2014-07-19 22:42:14 +02:00
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Potential format string problem (<a
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href="http://cwe.mitre.org/data/definitions/134.html">CWE-134</a>). Make
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format string constant. </i>
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2007-01-16 03:44:45 +01:00
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<pre>
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sprintf(s, unknown, bug);
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</pre>
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<li>test.c:23: <b> [4] </b> (format) <i> printf:
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2014-07-19 22:42:14 +02:00
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If format strings can be influenced by an attacker, they can be exploited
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(<a href="http://cwe.mitre.org/data/definitions/134.html">CWE-134</a>). Use
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a constant for the format specification. </i>
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2007-01-16 03:44:45 +01:00
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<pre>
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printf(bf, x);
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</pre>
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<li>test.c:25: <b> [4] </b> (buffer) <i> scanf:
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2014-07-19 22:42:14 +02:00
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The scanf() family's %s operation, without a limit specification, permits
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buffer overflows (<a
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2014-07-23 05:01:18 +02:00
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href="http://cwe.mitre.org/data/definitions/120.html">CWE-120</a>, <a
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href="http://cwe.mitre.org/data/definitions/20.html">CWE-20</a>). Specify a
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limit to %s, or use a different input function. </i>
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2007-01-16 03:44:45 +01:00
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<pre>
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scanf("%s", s);
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</pre>
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<li>test.c:27: <b> [4] </b> (buffer) <i> scanf:
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2014-07-19 22:42:14 +02:00
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The scanf() family's %s operation, without a limit specification, permits
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buffer overflows (<a
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2014-07-23 05:01:18 +02:00
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href="http://cwe.mitre.org/data/definitions/120.html">CWE-120</a>, <a
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href="http://cwe.mitre.org/data/definitions/20.html">CWE-20</a>). Specify a
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limit to %s, or use a different input function. </i>
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2007-01-16 03:44:45 +01:00
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<pre>
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scanf("%s", s);
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</pre>
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<li>test.c:38: <b> [4] </b> (format) <i> syslog:
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2014-07-19 22:42:14 +02:00
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If syslog's format strings can be influenced by an attacker, they can be
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exploited (<a
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href="http://cwe.mitre.org/data/definitions/134.html">CWE-134</a>). Use a
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constant format string for syslog. </i>
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2007-01-16 03:44:45 +01:00
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<pre>
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syslog(LOG_ERR, attacker_string);
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</pre>
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<li>test.c:49: <b> [4] </b> (buffer) <i> _mbscpy:
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2014-08-09 19:32:37 +02:00
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Does not check for buffer overflows when copying to destination [MS-banned]
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(<a href="http://cwe.mitre.org/data/definitions/120.html">CWE-120</a>).
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2014-07-19 22:42:14 +02:00
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Consider using a function version that stops copying at the end of the
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buffer. </i>
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2007-01-16 03:44:45 +01:00
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<pre>
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_mbscpy(d,s); /* like strcpy, this doesn't check for buffer overflow */
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</pre>
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<li>test.c:52: <b> [4] </b> (buffer) <i> lstrcat:
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2014-09-01 21:14:55 +02:00
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Does not check for buffer overflows when concatenating to destination
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[MS-banned] (<a
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2014-07-19 22:42:14 +02:00
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href="http://cwe.mitre.org/data/definitions/120.html">CWE-120</a>). </i>
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2007-01-16 03:44:45 +01:00
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<pre>
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lstrcat(d,s);
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</pre>
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<li>test.c:75: <b> [3] </b> (shell) <i> CreateProcess:
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2014-07-19 22:42:14 +02:00
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This causes a new process to execute and is difficult to use safely (<a
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href="http://cwe.mitre.org/data/definitions/78.html">CWE-78</a>). Specify
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the application path in the first argument, NOT as part of the second, or
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embedded spaces could allow an attacker to force a different program to
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run. </i>
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2007-01-16 03:44:45 +01:00
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<pre>
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CreateProcess(NULL, "C:\\Program Files\\GoodGuy\\GoodGuy.exe -x", "");
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</pre>
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<li>test.c:75: <b> [3] </b> (shell) <i> CreateProcess:
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2014-07-19 22:42:14 +02:00
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This causes a new process to execute and is difficult to use safely (<a
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href="http://cwe.mitre.org/data/definitions/78.html">CWE-78</a>). Specify
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the application path in the first argument, NOT as part of the second, or
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embedded spaces could allow an attacker to force a different program to
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run. </i>
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2007-01-16 03:44:45 +01:00
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<pre>
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CreateProcess(NULL, "C:\\Program Files\\GoodGuy\\GoodGuy.exe -x", "");
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</pre>
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<li>test.c:91: <b> [3] </b> (buffer) <i> getopt_long:
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2014-07-19 22:42:14 +02:00
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Some older implementations do not protect against internal buffer overflows
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2014-07-23 05:01:18 +02:00
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(<a href="http://cwe.mitre.org/data/definitions/120.html">CWE-120</a>, <a
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href="http://cwe.mitre.org/data/definitions/20.html">CWE-20</a>). Check
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implementation on installation, or limit the size of all string inputs. </i>
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2007-01-16 03:44:45 +01:00
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<pre>
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while ((optc = getopt_long (argc, argv, "a",longopts, NULL )) != EOF) {
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</pre>
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<li>test.c:16: <b> [2] </b> (buffer) <i> strcpy:
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2014-08-09 19:32:37 +02:00
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Does not check for buffer overflows when copying to destination [MS-banned]
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(<a href="http://cwe.mitre.org/data/definitions/120.html">CWE-120</a>).
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2014-09-01 21:14:55 +02:00
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Consider using snprintf, strcpy_s, or strlcpy (warning: strncpy easily
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2014-07-19 22:42:14 +02:00
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misused). Risk is low because the source is a constant string. </i>
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2007-01-16 03:44:45 +01:00
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<pre>
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strcpy(a, gettext("Hello there")); // Did this work?
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</pre>
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<li>test.c:19: <b> [2] </b> (buffer) <i> sprintf:
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2014-07-19 22:42:14 +02:00
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Does not check for buffer overflows (<a
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href="http://cwe.mitre.org/data/definitions/120.html">CWE-120</a>). Use
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sprintf_s, snprintf, or vsnprintf. Risk is low because the source has a
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constant maximum length. </i>
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2007-01-16 03:44:45 +01:00
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<pre>
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sprintf(s, "hello");
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</pre>
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<li>test.c:45: <b> [2] </b> (buffer) <i> char:
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2014-07-23 05:01:18 +02:00
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Statically-sized arrays can be improperly restricted, leading to potential
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2014-08-09 19:32:37 +02:00
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overflows or other issues (CWE-119!/<a
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2014-07-19 22:42:14 +02:00
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href="http://cwe.mitre.org/data/definitions/120.html">CWE-120</a>). Perform
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bounds checking, use functions that limit length, or ensure that the size
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2014-07-20 01:16:41 +02:00
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is larger than the maximum possible length. </i>
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2007-01-16 03:44:45 +01:00
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<pre>
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char d[20];
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</pre>
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<li>test.c:46: <b> [2] </b> (buffer) <i> char:
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2014-07-23 05:01:18 +02:00
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Statically-sized arrays can be improperly restricted, leading to potential
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2014-08-09 19:32:37 +02:00
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overflows or other issues (CWE-119!/<a
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2014-07-19 22:42:14 +02:00
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href="http://cwe.mitre.org/data/definitions/120.html">CWE-120</a>). Perform
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bounds checking, use functions that limit length, or ensure that the size
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2014-07-20 01:16:41 +02:00
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is larger than the maximum possible length. </i>
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2007-01-16 03:44:45 +01:00
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<pre>
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char s[20];
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</pre>
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<li>test.c:50: <b> [2] </b> (buffer) <i> memcpy:
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2014-07-19 22:42:14 +02:00
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Does not check for buffer overflows when copying to destination (<a
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href="http://cwe.mitre.org/data/definitions/120.html">CWE-120</a>). Make
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sure destination can always hold the source data. </i>
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2007-01-16 03:44:45 +01:00
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<pre>
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memcpy(d,s);
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</pre>
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<li>test.c:51: <b> [2] </b> (buffer) <i> CopyMemory:
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2014-07-19 22:42:14 +02:00
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Does not check for buffer overflows when copying to destination (<a
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href="http://cwe.mitre.org/data/definitions/120.html">CWE-120</a>). Make
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sure destination can always hold the source data. </i>
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2007-01-16 03:44:45 +01:00
|
|
|
<pre>
|
|
|
|
|
CopyMemory(d,s);
|
|
|
|
|
</pre>
|
|
|
|
|
<li>test.c:97: <b> [2] </b> (misc) <i> fopen:
|
|
|
|
|
Check when opening files - can an attacker redirect it (via symlinks),
|
2014-07-19 22:42:14 +02:00
|
|
|
force the opening of special file type (e.g., device files), move things
|
|
|
|
|
around to create a race condition, control its ancestors, or change its
|
|
|
|
|
contents? (<a
|
|
|
|
|
href="http://cwe.mitre.org/data/definitions/362.html">CWE-362</a>). </i>
|
2007-01-16 03:44:45 +01:00
|
|
|
<pre>
|
|
|
|
|
f = fopen("/etc/passwd", "r");
|
|
|
|
|
</pre>
|
|
|
|
|
<li>test.c:15: <b> [1] </b> (buffer) <i> strcpy:
|
2014-08-09 19:32:37 +02:00
|
|
|
Does not check for buffer overflows when copying to destination [MS-banned]
|
|
|
|
|
(<a href="http://cwe.mitre.org/data/definitions/120.html">CWE-120</a>).
|
2014-09-01 21:14:55 +02:00
|
|
|
Consider using snprintf, strcpy_s, or strlcpy (warning: strncpy easily
|
2014-07-19 22:42:14 +02:00
|
|
|
misused). Risk is low because the source is a constant character. </i>
|
2007-01-16 03:44:45 +01:00
|
|
|
<pre>
|
|
|
|
|
strcpy(a, "\n"); // Did this work?
|
|
|
|
|
</pre>
|
|
|
|
|
<li>test.c:18: <b> [1] </b> (buffer) <i> sprintf:
|
2014-07-19 22:42:14 +02:00
|
|
|
Does not check for buffer overflows (<a
|
|
|
|
|
href="http://cwe.mitre.org/data/definitions/120.html">CWE-120</a>). Use
|
|
|
|
|
sprintf_s, snprintf, or vsnprintf. Risk is low because the source is a
|
|
|
|
|
constant character. </i>
|
2007-01-16 03:44:45 +01:00
|
|
|
<pre>
|
|
|
|
|
sprintf(s, "\n");
|
|
|
|
|
</pre>
|
|
|
|
|
<li>test.c:26: <b> [1] </b> (buffer) <i> scanf:
|
2014-07-19 22:42:14 +02:00
|
|
|
It's unclear if the %s limit in the format string is small enough (<a
|
|
|
|
|
href="http://cwe.mitre.org/data/definitions/120.html">CWE-120</a>). Check
|
|
|
|
|
that the limit is sufficiently small, or use a different input function. </i>
|
2007-01-16 03:44:45 +01:00
|
|
|
<pre>
|
|
|
|
|
scanf("%10s", s);
|
|
|
|
|
</pre>
|
|
|
|
|
<li>test.c:53: <b> [1] </b> (buffer) <i> strncpy:
|
2014-07-19 22:42:14 +02:00
|
|
|
Easily used incorrectly; doesn't always \0-terminate or check for invalid
|
2014-08-09 19:32:37 +02:00
|
|
|
pointers [MS-banned] (<a
|
2014-07-19 22:42:14 +02:00
|
|
|
href="http://cwe.mitre.org/data/definitions/120.html">CWE-120</a>). </i>
|
2007-01-16 03:44:45 +01:00
|
|
|
<pre>
|
|
|
|
|
strncpy(d,s);
|
|
|
|
|
</pre>
|
|
|
|
|
<li>test.c:54: <b> [1] </b> (buffer) <i> _tcsncpy:
|
2014-07-19 22:42:14 +02:00
|
|
|
Easily used incorrectly; doesn't always \0-terminate or check for invalid
|
2014-08-09 19:32:37 +02:00
|
|
|
pointers [MS-banned] (<a
|
2014-07-19 22:42:14 +02:00
|
|
|
href="http://cwe.mitre.org/data/definitions/120.html">CWE-120</a>). </i>
|
2007-01-16 03:44:45 +01:00
|
|
|
<pre>
|
|
|
|
|
_tcsncpy(d,s);
|
|
|
|
|
</pre>
|
|
|
|
|
<li>test.c:55: <b> [1] </b> (buffer) <i> strncat:
|
2014-07-19 22:42:14 +02:00
|
|
|
Easily used incorrectly (e.g., incorrectly computing the correct maximum
|
2014-09-01 21:14:55 +02:00
|
|
|
size to add) [MS-banned] (<a
|
2014-07-19 22:42:14 +02:00
|
|
|
href="http://cwe.mitre.org/data/definitions/120.html">CWE-120</a>).
|
2014-09-01 21:14:55 +02:00
|
|
|
Consider strcat_s, strlcat, snprintf, or automatically resizing strings. </i>
|
2007-01-16 03:44:45 +01:00
|
|
|
<pre>
|
|
|
|
|
strncat(d,s,10);
|
|
|
|
|
</pre>
|
|
|
|
|
<li>test.c:58: <b> [1] </b> (buffer) <i> strlen:
|
2014-07-20 01:10:12 +02:00
|
|
|
Does not handle strings that are not \0-terminated; if given one it may
|
|
|
|
|
perform an over-read (it could cause a crash if unprotected) (<a
|
|
|
|
|
href="http://cwe.mitre.org/data/definitions/126.html">CWE-126</a>). </i>
|
2007-01-16 03:44:45 +01:00
|
|
|
<pre>
|
|
|
|
|
n = strlen(d);
|
|
|
|
|
</pre>
|
|
|
|
|
<li>test.c:64: <b> [1] </b> (buffer) <i> MultiByteToWideChar:
|
2014-07-19 22:42:14 +02:00
|
|
|
Requires maximum length in CHARACTERS, not bytes (<a
|
|
|
|
|
href="http://cwe.mitre.org/data/definitions/120.html">CWE-120</a>). Risk is
|
2014-07-13 06:06:04 +02:00
|
|
|
very low, the length appears to be in characters not bytes. </i>
|
2007-01-16 03:44:45 +01:00
|
|
|
<pre>
|
|
|
|
|
MultiByteToWideChar(CP_ACP,0,szName,-1,wszUserName,sizeof(wszUserName)/sizeof(wszUserName[0]));
|
|
|
|
|
</pre>
|
|
|
|
|
<li>test.c:66: <b> [1] </b> (buffer) <i> MultiByteToWideChar:
|
2014-07-19 22:42:14 +02:00
|
|
|
Requires maximum length in CHARACTERS, not bytes (<a
|
|
|
|
|
href="http://cwe.mitre.org/data/definitions/120.html">CWE-120</a>). Risk is
|
2014-07-13 06:06:04 +02:00
|
|
|
very low, the length appears to be in characters not bytes. </i>
|
2007-01-16 03:44:45 +01:00
|
|
|
<pre>
|
|
|
|
|
MultiByteToWideChar(CP_ACP,0,szName,-1,wszUserName,sizeof wszUserName /sizeof(wszUserName[0]));
|
|
|
|
|
</pre>
|
|
|
|
|
</ul>
|
2014-07-19 22:42:14 +02:00
|
|
|
<h2>Analysis Summary</h2>
|
2007-01-16 03:44:45 +01:00
|
|
|
<p>
|
|
|
|
|
Hits = 36
|
|
|
|
|
<br>
|
|
|
|
|
Lines analyzed = 118
|
|
|
|
|
<br>
|
|
|
|
|
Physical Source Lines of Code (SLOC) = 80
|
|
|
|
|
<br>
|
2007-01-16 04:44:31 +01:00
|
|
|
Hits@level = [0] 0 [1] 9 [2] 7 [3] 3 [4] 10 [5] 7 <br>
|
|
|
|
|
Hits@level+ = [0+] 36 [1+] 36 [2+] 27 [3+] 20 [4+] 17 [5+] 7 <br>
|
|
|
|
|
Hits/KSLOC@level+ = [0+] 450 [1+] 450 [2+] 337.5 [3+] 250 [4+] 212.5 [5+] 87.5 <br>
|
2007-01-16 03:44:45 +01:00
|
|
|
Suppressed hits = 2 (use --neverignore to show them)
|
|
|
|
|
<br>
|
|
|
|
|
Minimum risk level = 1
|
|
|
|
|
<br>
|
|
|
|
|
Not every hit is necessarily a security vulnerability.
|
|
|
|
|
<br>
|
|
|
|
|
There may be other security vulnerabilities; review your code!
|
2014-07-29 03:25:00 +02:00
|
|
|
<br>
|
|
|
|
|
See '<a href="http://www.dwheeler.com/secure-programs">Secure Programming for Linux and Unix HOWTO</a>'
|
|
|
|
|
(<a href="http://www.dwheeler.com/secure-programs">http://www.dwheeler.com/secure-programs</a>) for more information.
|
2007-01-16 03:44:45 +01:00
|
|
|
</body>
|
|
|
|
|
</html>
|
