Protect yourself against future threats.
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AUSCERT Security Bulletin
ASB-2010.0055
New version of ModSecurity released
16 February 2010
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AusCERT Security Bulletin Summary
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Product: ModSecurity 2.5.11 and prior
Operating System: UNIX variants (UNIX, Linux, OSX)
Windows
Impact/Access: Denial of Service -- Remote/Unauthenticated
Reduced Security -- Remote/Unauthenticated
Resolution: Patch/Upgrade
Member content until: Thursday, March 18 2010
OVERVIEW
ModSecurity 2.5.12 has been released correcting security
vulnerabilities.
IMPACT
ModSecurity 2.5.11 and prior are susceptible to denial of service via
regular expressions. The release notes state
* "Added PCRE match limits (SecPcreMatchLimit/
SecPcreMatchLimitRecursion) to aide in REDoS type attacks. A rule
that goes over the limits will set TX:MSC_PCRE_LIMITS_EXCEEDED." [1]
* "Reduced default PCRE match limits reducing impact of REDoS on
poorly written regex rules. Reported by Sogeti/ESEC R&D." [1]
Additionally, a memory leak which may lead to a denial of service has
been fixed in v1 cookie parser.
SecAction rules may be bypassed when using a CONNECT request method.
MITIGATION
Update to the latest version which is available at
http://www.modsecurity.org/download
REFERENCES
[1] Changes 2.5.12
http://sourceforge.net/projects/mod-security/files/modsecurity-apache/2.5.12/CHANGES_2.5.12.txt/view
AusCERT has made every effort to ensure that the information contained
in this document is accurate. However, the decision to use the information
described is the responsibility of each user or organisation. The decision to
follow or act on information or advice contained in this security bulletin is
the responsibility of each user or organisation, and should be considered in
accordance with your organisation's site policies and procedures. AusCERT
takes no responsibility for consequences which may arise from following or
acting on information or advice contained in this security bulletin.
If you believe that your computer system has been compromised or attacked in
any way, we encourage you to let us know by completing the secure National IT
Incident Reporting Form at:
http://www.auscert.org.au/render.html?it=3192
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Australian Computer Emergency Response Team
The University of Queensland
Brisbane
Qld 4072
Internet Email: auscert@auscert.org.au
Facsimile: (07) 3365 7031
Telephone: (07) 3365 4417 (International: +61 7 3365 4417)
AusCERT personnel answer during Queensland business hours
which are GMT+10:00 (AEST).
On call after hours for member emergencies only.
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