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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 =========================================================================== AUSCERT Security Bulletin ASB-2010.0055 New version of ModSecurity released 16 February 2010 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- 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 =========================================================================== 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. =========================================================================== -----BEGIN PGP SIGNATURE----- Comment: https://www.auscert.org.au/1967 iD8DBQFLeftu/iFOrG6YcBERAlmvAJ9hg9kCulGmN3IsiguXLW3OpxP+CACfVguS kjOgTkShTqhCQkqtP/tSHmk= =tKv5 -----END PGP SIGNATURE-----