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Home arrow SecurityAlert Database

Arrow  Topic :

Snort HTTP Inspect Pre-Processor Uricontent Bypass


Arrow  SecurityAlert : 1018
Arrow  CVE : CVE-2006-2769
Arrow  SecurityRisk : Medium  Security Risk Medium  (About)
Arrow  Remote Exploit : Yes
Arrow  Local Exploit : No
Arrow  Exploit Available : No
Arrow  Credit : Christian Swartzbaugh
Arrow  Published : 06.06.2006

Arrow  Affected Software : Snort 2.4.0 through 2.4.4



Arrow  Advisory Content :  

For those of you using snort on this list, this got posted to some of
the snort mailing lists this morning.

http://www.demarc.com/support/downloads/patch_20060531
http://www.osvdb.org/25837

"The evasion technique allows an attack to bypass detection of
"uricontent" rules by
adding a carriage return to the end of a URL, directly before the HTTP
protocol
declaration.
This affects thousands of rules in the standard Snort base rule sets.

Due to the seriousness of this vulnerability, we have developed a
working patch for
public review. See below.
This patch addresses the carriage return bug and should catch the known
evasion
attempts but further research needs to be done to determine if there
are any other

possible impacts of this bug. The detection for evasion is turned on
by default under
all profiles but can also be used as a server configuration option:
-----HTTP Inspect Server Configuration-----

non_std_cr <yes|no>

This option generates an alert when a non standard carriage return
character is
detected in the URI.
-----end-----

More information including a pre-patched tarball, a simple proof of
concept, and a

copy of this patch ..."

feofil




Arrow  Feedback :

If you have additional information or notice any errors regarding this security advisory, please use contact form or email us at info()securityreason()com.
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