Difference between revisions of "ModSecurity CRS RuleID-960911"

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(Created page with '== Rule ID: 906911 == === Rule === SecRule REQUEST_LINE "!^(?:(?:[a-z]{3,10}\s+(?:\w{3,7}?://[\w\-\./]*(?::\d+)?)?/[^?#]*(?:\?[^#\s]*)?(?:#[\S]*)?|connect (?:\d{1,3}\.){3}\d{1,…')
 
(Rule ID: 906911)
 
(13 intermediate revisions by one user not shown)
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== Rule ID: 906911 ==
 
== Rule ID: 906911 ==
  
=== Rule ===
+
<table style="border-style:double;border-width:3px;" >
 +
<tr><td style="border-style:solid;border-width:1px;background-color:#CCCCCC;text-transform:uppercase " >Rule ID</td>
 +
<td style="background-color:#F2F2F2;table-layout:fixed;width:700px;" >
 +
906911
 +
</td></tr>
 +
<tr><td style="border-style:solid;border-width:1px;background-color:#CCCCCC;text-transform:uppercase " >Rule Message</td>
 +
<td style="background-color:#F2F2F2;table-layout:fixed;width:700px;" >
 +
Invalid HTTP Request Line
 +
</td></tr>
 +
<tr><td style="border-style:solid;border-width:1px;background-color:#CCCCCC;text-transform:uppercase " >Rule Summary</td>
 +
<td style="background-color:#F2F2F2;table-layout:fixed;width:700px;" >
 +
Validate request line against the format specified in the HTTP RFC
 +
</td></tr>
 +
<tr><td style="border-style:solid;border-width:1px;background-color:#CCCCCC;text-transform:uppercase " >Impact</td>
 +
<td style="background-color:#F2F2F2;table-layout:fixed;width:700px;" >
 +
4 - Warning
 +
</td></tr>
 +
<tr><td style="border-style:solid;border-width:1px;background-color:#CCCCCC;text-transform:uppercase " >Rule</td>
 +
<td style="background-color:#F2F2F2;table-layout:fixed;width:700px;" >
 +
<code>
 
  SecRule REQUEST_LINE "!^(?:(?:[a-z]{3,10}\s+(?:\w{3,7}?://[\w\-\./]*(?::\d+)?)?/[^?#]*(?:\?[^#\s]*)?(?:#[\S]*)?|connect (?:\d{1,3}\.){3}\d{1,3}\.?(?::\d+)?|options \*)\s+[\w\./]+|get /[^?#]*(?:\?[^#\s]*)?(?:#[\S]*)?)$" \
 
  SecRule REQUEST_LINE "!^(?:(?:[a-z]{3,10}\s+(?:\w{3,7}?://[\w\-\./]*(?::\d+)?)?/[^?#]*(?:\?[^#\s]*)?(?:#[\S]*)?|connect (?:\d{1,3}\.){3}\d{1,3}\.?(?::\d+)?|options \*)\s+[\w\./]+|get /[^?#]*(?:\?[^#\s]*)?(?:#[\S]*)?)$" \
"t:none,t:lowercase,phase:2,rev:'2.0.8',pass,nolog,auditlog,msg:'Invalid HTTP Request Line',id:'960911',severity:'4',tag:'http://www.w3.org/Protocols/rfc2616/rfc2616-sec3.html#sec3.2.1',setvar:'tx.msg=%{rule.msg}',setvar:tx.anomaly_score=+%{tx.notice_anomaly_score},setvar:tx.protocol_violation_score=+%{tx.notice_anomaly_score},setvar:'tx.%{rule.id}-PROTOCOL_VIOLATION/INVALID_REQ-%{matched_var_name}=%{matched_var}'"
+
    "phase:1,t:none,t:lowercase,block,msg:'Invalid HTTP Request Line',id:'960911',severity:'4',rev:'2.2.0',logdata:'%{request_line}',tag:'https://www.owasp.org/index.php/ModSecurity_CRS_RuleID-%{tx.id}',tag:'http://www.w3.org/Protocols/rfc2616/rfc2616-sec3.html#sec3.2.1',tag:'RULE_ACCURACY_LEVEL/5',setvar:'tx.msg=%{rule.msg}',setvar:'tx.id=%{rule.id}',setvar:tx.anomaly_score=+%{tx.notice_anomaly_score},setvar:tx.protocol_violation_score=+%{tx.notice_anomaly_score},setvar:'tx.%{rule.id}-PROTOCOL_VIOLATION/INVALID_REQ-%{matched_var_name}=%{matched_var}'"</code>
 
+
</td></tr>
=== Rule Summary ===
+
<tr><td style="border-style:solid;border-width:1px;background-color:#CCCCCC;text-transform:uppercase " >Detailed Rule Information</td>
*Validate request line against the format specified in the HTTP RFC
+
<td style="background-color:#F2F2F2;table-layout:fixed;width:700px;" >
* Uses rule negation against the regex for positive security.  The regex specifies the proper construction of URI request lines such as:
+
*Uses rule negation against the regex for positive security.  The regex specifies the proper construction of URI request lines such as:
 
  "http:" "//" host [ ":" port ] [ abs_path [ "?" query ]]  
 
  "http:" "//" host [ ":" port ] [ abs_path [ "?" query ]]  
 +
*It also outlines proper construction for CONNECT, OPTIONS and GET requests.
 +
<pre>
 +
///  A description of the regular expression:
 +
/// 
 +
///  Beginning of line or string
 +
///  Match expression but don't capture it. [(?:[a-z]{3,10}\s+(?:\w{3,7}?://[\w\-\./]*(?::\d+)?)?/[^?#]*(?:\?[^#\s]*)?(?:#[\S]*)?|connect (?:\d{1,3}\.){3}\d{1,3}\.?(?::\d+)?|options \*)\s+[\w\./]+|get /[^?#]*(?:\?[^#\s]*)?(?:#[\S]*)?]
 +
///      Select from 2 alternatives
 +
///          (?:[a-z]{3,10}\s+(?:\w{3,7}?://[\w\-\./]*(?::\d+)?)?/[^?#]*(?:\?[^#\s]*)?(?:#[\S]*)?|connect (?:\d{1,3}\.){3}\d{1,3}\.?(?::\d+)?|options \*)\s+[\w\./]+
 +
///              Match expression but don't capture it. [[a-z]{3,10}\s+(?:\w{3,7}?://[\w\-\./]*(?::\d+)?)?/[^?#]*(?:\?[^#\s]*)?(?:#[\S]*)?|connect (?:\d{1,3}\.){3}\d{1,3}\.?(?::\d+)?|options \*]
 +
///                  Select from 3 alternatives
 +
///                      [a-z]{3,10}\s+(?:\w{3,7}?://[\w\-\./]*(?::\d+)?)?/[^?#]*(?:\?[^#\s]*)?(?:#[\S]*)?
 +
///                          Any character in this class: [a-z], between 3 and 10 repetitions
 +
///                          Whitespace, one or more repetitions
 +
///                          Match expression but don't capture it. [\w{3,7}?://[\w\-\./]*(?::\d+)?], zero or one repetitions
 +
///                              \w{3,7}?://[\w\-\./]*(?::\d+)?
 +
///                                  Alphanumeric, between 3 and 7 repetitions, as few as possible
 +
///                                  ://
 +
///                                  Any character in this class: [\w\-\./], any number of repetitions
 +
///                                  Match expression but don't capture it. [:\d+], zero or one repetitions
 +
///                                      :\d+
 +
///                                          :
 +
///                                          Any digit, one or more repetitions
 +
///                          /
 +
///                          Any character that is NOT in this class: [?#], any number of repetitions
 +
///                          Match expression but don't capture it. [\?[^#\s]*], zero or one repetitions
 +
///                              \?[^#\s]*
 +
///                                  Literal ?
 +
///                                  Any character that is NOT in this class: [#\s], any number of repetitions
 +
///                          Match expression but don't capture it. [#[\S]*], zero or one repetitions
 +
///                              #[\S]*
 +
///                                  #
 +
///                                  Any character in this class: [\S], any number of repetitions
 +
///                      connect (?:\d{1,3}\.){3}\d{1,3}\.?(?::\d+)?
 +
///                          connect
 +
///                          Space
 +
///                          Match expression but don't capture it. [\d{1,3}\.], exactly 3 repetitions
 +
///                              \d{1,3}\.
 +
///                                  Any digit, between 1 and 3 repetitions
 +
///                                  Literal .
 +
///                          Any digit, between 1 and 3 repetitions
 +
///                          Literal ., zero or one repetitions
 +
///                          Match expression but don't capture it. [:\d+], zero or one repetitions
 +
///                              :\d+
 +
///                                  :
 +
///                                  Any digit, one or more repetitions
 +
///                      options \*
 +
///                          options
 +
///                          Space
 +
///                          Literal *
 +
///              Whitespace, one or more repetitions
 +
///              Any character in this class: [\w\./], one or more repetitions
 +
///          get /[^?#]*(?:\?[^#\s]*)?(?:#[\S]*)?
 +
///              get
 +
///              Space
 +
///              /
 +
///              Any character that is NOT in this class: [?#], any number of repetitions
 +
///              Match expression but don't capture it. [\?[^#\s]*], zero or one repetitions
 +
///                  \?[^#\s]*
 +
///                      Literal ?
 +
///                      Any character that is NOT in this class: [#\s], any number of repetitions
 +
///              Match expression but don't capture it. [#[\S]*], zero or one repetitions
 +
///                  #[\S]*
 +
///                      #
 +
///                      Any character in this class: [\S], any number of repetitions
 +
///  End of line or string
 +
</pre>
 +
</td></tr>
 +
<tr><td style="border-style:solid;border-width:1px;background-color:#CCCCCC;text-transform:uppercase " >Example Payload</td>
 +
<td style="background-color:#F2F2F2;table-layout:fixed;width:700px;" >
 +
Here is an example payloads taken from HTTPrint (http://net-square.com/httprint/) that will trigger this rule.
  
*It also outlines proper construction for CONNECT, OPTIONS and GET requests.
+
127.0.0.1 - - [14/Sep/2010:11:51:43 -0400] "\x16\x03" 501 214 TI@aD8CoAWYAAAOFHNMAAACA
 +
</td></tr>
 +
<tr><td style="border-style:solid;border-width:1px;background-color:#CCCCCC;text-transform:uppercase " >Example Audit Log Entry</td>
 +
<td style="background-color:#F2F2F2;table-layout:fixed;width:700px;" >
 +
Include an example ModSecurity Audit Log Entry for when this rule matchs.
 +
<pre>
 +
--1167a167-A--
 +
[14/Sep/2010:11:51:43 --0400] TI@aD8CoAWYAAAOFHNMAAACA 127.0.0.1 51285 127.0.0.1 80
 +
--1167a167-B--
 +
^V^C
  
=== Impact ===
+
--1167a167-F--
4- Warning.
+
  
=== Detailed Information ===
+
--1167a167-H--
 +
Message: Match of "rx ^(?:(?:[a-z]{3,10}\\s+(?:\\w{3,7}?://[\\w\\-\\./]*(?::\\d+)?)?/[^?#]*(?:\\?[^#\\s]*)?(?:#[\\S]*)?|connect (?:\\d{1,3}\\.){3}\\d{1,3}\\.?(?::\\d+)?|options \\*)\\s+[\\w\\./]+|get /[^?#]*(?:\\?[^#\\s]*)?(?:#[\\S]*)?)$"
 +
against "REQUEST_LINE" required. [file "/usr/local/apache/conf/modsec_current/base_rules/modsecurity_crs_20_protocol_violations.conf"] [line "34"] [id "960911"] [rev "2.0.8"] [msg "Invalid HTTP Request Line"] [severity "WARNING"]
 +
[tag "http://www.w3.org/Protocols/rfc2616/rfc2616-sec3.html#sec3.2.1"]
 +
Apache-Error: [file "core.c"] [line 3773] [level 3] Invalid method in request \\x16\\x03
 +
Stopwatch: 1284479503453580 43606 (4888 42377 -)
 +
Producer: ModSecurity for Apache/2.5.12 (http://www.modsecurity.org/); core ruleset/2.0.8.
 +
Server: Apache/2.2.12 (Unix) mod_ssl/2.2.12 OpenSSL/0.9.8l DAV/2
  
 
+
--1167a167-Z--
Provide detailed information about the rule construction such as:
+
</pre>
*Why the variable list specified was used
+
</td></tr>
*A description of the regular expression used - what is is looking for in plain english
+
<tr><td style="border-style:solid;border-width:1px;background-color:#CCCCCC;text-transform:uppercase " >Attack Scenarios</td>
*What actions are used and why
+
<td style="background-color:#F2F2F2;table-layout:fixed;width:700px;" >
 
+
Some malformed URIs are created on purpose as part of HTTP fingerprinting scans -
=== Affected Software ===
+
http://projects.webappsec.org/Fingerprinting
If this attack only affects a specific piece of public software (if this is a virtual patch for a public disclosure) specify which info.
+
Other times, these are caused by poorly written web clients.
 
+
</td></tr>
=== Attack Scenarios ===
+
<tr><td style="border-style:solid;border-width:1px;background-color:#CCCCCC;text-transform:uppercase " >Ease of Attack</td>
Provide any data around "how" the attack is carried out.
+
<td style="background-color:#F2F2F2;table-layout:fixed;width:700px;" >
 
+
Easy
=== Ease of Attack ===
+
</td></tr>
How easy is it for an attacker to carry out the attack?
+
<tr><td style="border-style:solid;border-width:1px;background-color:#CCCCCC;text-transform:uppercase " >Ease of Detection</td>
 
+
<td style="background-color:#F2F2F2;table-layout:fixed;width:700px;" >
=== Ease of Detection ===
+
Easy with either regular expressions or by monitoring Apache error logging in phase:5
How easy is it for a defender to use ModSecurity to accurately detect this attack?
+
</td></tr>
 
+
<tr><td style="border-style:solid;border-width:1px;background-color:#CCCCCC;text-transform:uppercase " >False Positives</td>
=== False Positives ===
+
<td style="background-color:#F2F2F2;table-layout:fixed;width:700px;" >
 +
'''None known'''<br>
 
If there are any known false positives - specify them here
 
If there are any known false positives - specify them here
 
+
Also sign-up for the Reporting False Positives mail-list here:
=== False Negatives ===
+
https://lists.sourceforge.net/lists/listinfo/mod-security-report-false-positives
Are there any know issues with evasions or how an attacker might bypass detection?
+
<br>
 
+
Send FP Report emails here:<br>
=== Corrective Action  ===
+
mod-security-report-false-positives[[Image:Justat.gif|10x]]lists.sourceforge.net
Any tuning recommendations for the existing rule?
+
</td></tr>
 
+
<tr><td style="border-style:solid;border-width:1px;background-color:#CCCCCC;text-transform:uppercase " >False Negatives</td>
=== Contributors ===
+
<td style="background-color:#F2F2F2;table-layout:fixed;width:700px;" >
Specify your name and email if you want credit for the rule or documentation of it.
+
'''None known'''
 
+
</td></tr>
=== Additional References ===
+
<tr><td style="border-style:solid;border-width:1px;background-color:#CCCCCC;text-transform:uppercase " >Rule Maturity</td>
Provide any external reference links (e.g. - if this is a virtual patch for a known vuln link to the Bugtraq or CVE page).
+
<td style="background-color:#F2F2F2;table-layout:fixed;width:700px;" >
 +
'''8'''<br>
 +
10 point scale (0-9) where:<br>0 = Beta/Experimental <br>9 = Heavily Tested
 +
</td></tr>
 +
<tr><td style="border-style:solid;border-width:1px;background-color:#CCCCCC;text-transform:uppercase " >Rule Accuracy</td>
 +
<td style="background-color:#F2F2F2;table-layout:fixed;width:700px;" >
 +
'''8'''<br>
 +
10 point scale (0-9) where:<br>0 = High % of FP<br>5 = No false positives reported
 +
</td></tr>
 +
<tr><td style="border-style:solid;border-width:1px;background-color:#CCCCCC;text-transform:uppercase " >Rule Documentation Contributor(s)</td>
 +
<td style="background-color:#F2F2F2;table-layout:fixed;width:700px;" >
 +
Ryan Barnett - ryan.barnett[[Image:Justat.gif|10px]]owasp.org
 +
</td></tr>
 +
<tr><td style="border-style:solid;border-width:1px;background-color:#CCCCCC;text-transform:uppercase " >Additional References</td>
 +
<td style="background-color:#F2F2F2;table-layout:fixed;width:700px;" >
 +
http://www.w3.org/Protocols/rfc2616/rfc2616-sec3.html#sec3.2.1
 +
</td></tr>
 +
</table>
 +
[[Category:OWASP ModSecurity Core Rule Set Project]]

Latest revision as of 12:29, 9 May 2011

Rule ID: 906911

Rule ID

906911

Rule Message

Invalid HTTP Request Line

Rule Summary

Validate request line against the format specified in the HTTP RFC

Impact

4 - Warning

Rule

SecRule REQUEST_LINE "!^(?:(?:[a-z]{3,10}\s+(?:\w{3,7}?://[\w\-\./]*(?::\d+)?)?/[^?#]*(?:\?[^#\s]*)?(?:#[\S]*)?|connect (?:\d{1,3}\.){3}\d{1,3}\.?(?::\d+)?|options \*)\s+[\w\./]+|get /[^?#]*(?:\?[^#\s]*)?(?:#[\S]*)?)$" \
   "phase:1,t:none,t:lowercase,block,msg:'Invalid HTTP Request Line',id:'960911',severity:'4',rev:'2.2.0',logdata:'%{request_line}',tag:'https://www.owasp.org/index.php/ModSecurity_CRS_RuleID-%{tx.id}',tag:'http://www.w3.org/Protocols/rfc2616/rfc2616-sec3.html#sec3.2.1',tag:'RULE_ACCURACY_LEVEL/5',setvar:'tx.msg=%{rule.msg}',setvar:'tx.id=%{rule.id}',setvar:tx.anomaly_score=+%{tx.notice_anomaly_score},setvar:tx.protocol_violation_score=+%{tx.notice_anomaly_score},setvar:'tx.%{rule.id}-PROTOCOL_VIOLATION/INVALID_REQ-%{matched_var_name}=%{matched_var}'"
Detailed Rule Information
  • Uses rule negation against the regex for positive security. The regex specifies the proper construction of URI request lines such as:
"http:" "//" host [ ":" port ] [ abs_path [ "?" query ]] 
  • It also outlines proper construction for CONNECT, OPTIONS and GET requests.
///  A description of the regular expression:
///  
///  Beginning of line or string
///  Match expression but don't capture it. [(?:[a-z]{3,10}\s+(?:\w{3,7}?://[\w\-\./]*(?::\d+)?)?/[^?#]*(?:\?[^#\s]*)?(?:#[\S]*)?|connect (?:\d{1,3}\.){3}\d{1,3}\.?(?::\d+)?|options \*)\s+[\w\./]+|get /[^?#]*(?:\?[^#\s]*)?(?:#[\S]*)?]
///      Select from 2 alternatives
///          (?:[a-z]{3,10}\s+(?:\w{3,7}?://[\w\-\./]*(?::\d+)?)?/[^?#]*(?:\?[^#\s]*)?(?:#[\S]*)?|connect (?:\d{1,3}\.){3}\d{1,3}\.?(?::\d+)?|options \*)\s+[\w\./]+
///              Match expression but don't capture it. [[a-z]{3,10}\s+(?:\w{3,7}?://[\w\-\./]*(?::\d+)?)?/[^?#]*(?:\?[^#\s]*)?(?:#[\S]*)?|connect (?:\d{1,3}\.){3}\d{1,3}\.?(?::\d+)?|options \*]
///                  Select from 3 alternatives
///                      [a-z]{3,10}\s+(?:\w{3,7}?://[\w\-\./]*(?::\d+)?)?/[^?#]*(?:\?[^#\s]*)?(?:#[\S]*)?
///                          Any character in this class: [a-z], between 3 and 10 repetitions
///                          Whitespace, one or more repetitions
///                          Match expression but don't capture it. [\w{3,7}?://[\w\-\./]*(?::\d+)?], zero or one repetitions
///                              \w{3,7}?://[\w\-\./]*(?::\d+)?
///                                  Alphanumeric, between 3 and 7 repetitions, as few as possible
///                                  ://
///                                  Any character in this class: [\w\-\./], any number of repetitions
///                                  Match expression but don't capture it. [:\d+], zero or one repetitions
///                                      :\d+
///                                          :
///                                          Any digit, one or more repetitions
///                          /
///                          Any character that is NOT in this class: [?#], any number of repetitions
///                          Match expression but don't capture it. [\?[^#\s]*], zero or one repetitions
///                              \?[^#\s]*
///                                  Literal ?
///                                  Any character that is NOT in this class: [#\s], any number of repetitions
///                          Match expression but don't capture it. [#[\S]*], zero or one repetitions
///                              #[\S]*
///                                  #
///                                  Any character in this class: [\S], any number of repetitions
///                      connect (?:\d{1,3}\.){3}\d{1,3}\.?(?::\d+)?
///                          connect
///                          Space
///                          Match expression but don't capture it. [\d{1,3}\.], exactly 3 repetitions
///                              \d{1,3}\.
///                                  Any digit, between 1 and 3 repetitions
///                                  Literal .
///                          Any digit, between 1 and 3 repetitions
///                          Literal ., zero or one repetitions
///                          Match expression but don't capture it. [:\d+], zero or one repetitions
///                              :\d+
///                                  :
///                                  Any digit, one or more repetitions
///                      options \*
///                          options
///                          Space
///                          Literal *
///              Whitespace, one or more repetitions
///              Any character in this class: [\w\./], one or more repetitions
///          get /[^?#]*(?:\?[^#\s]*)?(?:#[\S]*)?
///              get
///              Space
///              /
///              Any character that is NOT in this class: [?#], any number of repetitions
///              Match expression but don't capture it. [\?[^#\s]*], zero or one repetitions
///                  \?[^#\s]*
///                      Literal ?
///                      Any character that is NOT in this class: [#\s], any number of repetitions
///              Match expression but don't capture it. [#[\S]*], zero or one repetitions
///                  #[\S]*
///                      #
///                      Any character in this class: [\S], any number of repetitions
///  End of line or string
Example Payload

Here is an example payloads taken from HTTPrint (http://net-square.com/httprint/) that will trigger this rule.

127.0.0.1 - - [14/Sep/2010:11:51:43 -0400] "\x16\x03" 501 214 TI@aD8CoAWYAAAOFHNMAAACA
Example Audit Log Entry

Include an example ModSecurity Audit Log Entry for when this rule matchs.

--1167a167-A--
[14/Sep/2010:11:51:43 --0400] TI@aD8CoAWYAAAOFHNMAAACA 127.0.0.1 51285 127.0.0.1 80
--1167a167-B--
^V^C

--1167a167-F--

--1167a167-H--
Message: Match of "rx ^(?:(?:[a-z]{3,10}\\s+(?:\\w{3,7}?://[\\w\\-\\./]*(?::\\d+)?)?/[^?#]*(?:\\?[^#\\s]*)?(?:#[\\S]*)?|connect (?:\\d{1,3}\\.){3}\\d{1,3}\\.?(?::\\d+)?|options \\*)\\s+[\\w\\./]+|get /[^?#]*(?:\\?[^#\\s]*)?(?:#[\\S]*)?)$" 
against "REQUEST_LINE" required. [file "/usr/local/apache/conf/modsec_current/base_rules/modsecurity_crs_20_protocol_violations.conf"] [line "34"] [id "960911"] [rev "2.0.8"] [msg "Invalid HTTP Request Line"] [severity "WARNING"] 
[tag "http://www.w3.org/Protocols/rfc2616/rfc2616-sec3.html#sec3.2.1"]
Apache-Error: [file "core.c"] [line 3773] [level 3] Invalid method in request \\x16\\x03
Stopwatch: 1284479503453580 43606 (4888 42377 -)
Producer: ModSecurity for Apache/2.5.12 (http://www.modsecurity.org/); core ruleset/2.0.8.
Server: Apache/2.2.12 (Unix) mod_ssl/2.2.12 OpenSSL/0.9.8l DAV/2

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Attack Scenarios

Some malformed URIs are created on purpose as part of HTTP fingerprinting scans -

http://projects.webappsec.org/Fingerprinting

Other times, these are caused by poorly written web clients.

Ease of Attack

Easy

Ease of Detection

Easy with either regular expressions or by monitoring Apache error logging in phase:5

False Positives

None known
If there are any known false positives - specify them here Also sign-up for the Reporting False Positives mail-list here: https://lists.sourceforge.net/lists/listinfo/mod-security-report-false-positives
Send FP Report emails here:
mod-security-report-false-positives10xlists.sourceforge.net

False Negatives

None known

Rule Maturity

8
10 point scale (0-9) where:
0 = Beta/Experimental
9 = Heavily Tested

Rule Accuracy

8
10 point scale (0-9) where:
0 = High % of FP
5 = No false positives reported

Rule Documentation Contributor(s)

Ryan Barnett - ryan.barnettJustat.gifowasp.org

Additional References

http://www.w3.org/Protocols/rfc2616/rfc2616-sec3.html#sec3.2.1