February 19, 2007 Summary: Sourcefire has learned of a remotely exploitable vulnerability in the Snort DCE/RPC preprocessor. This preprocessor is vulnerable to a stack-based buffer overflow that could potentially allow attackers to execute code with the same privileges as the Snort binary. Sourcefire has prepared updates for Snort open-source software to address this issue. This vulnerability has been identified as CVE-2006-5276. Snort Versions Affected: * Snort 2.6.1, 2.6.1.1, and 2.6.1.2 * Snort 2.7.0 beta 1 This vulnerability also affects Sourcefire commercial products. For information and updates for Sourcefire products, please go to the Sourcefire support site. Mitigating Factors: Users who have disabled the DCE/RPC preprocessor are not vulnerable. However, the DCE/RPC preprocessor is enabled by default. Recommended Actions: * Open-source Snort 2.6.1.x users are advised to upgrade to Snort 2.6.1.3 (or later) immediately. * Open-source Snort 2.7 beta users are advised to mitigate this issue by disabling the DCE/RPC preprocessor. This issue will be resolved in Snort 2.7 beta 2. Workarounds: Snort users who cannot upgrade immediately are advised to disable the DCE/RPC preprocessor by removing the DCE/RPC preprocessor directives from snort.conf and restarting Snort. However, be advised that disabling the DCE/RPC preprocessor reduces detection capabilities for attacks in DCE/RPC traffic. After upgrading, customers should reenable the DCE/RPC preprocessor. Detecting Attacks Against This Vulnerability: Sourcefire will be releasing a rule pack that provides detection for attacks against this vulnerability. FAQs: What does the update do? - Snort 2.6.1.3 (or later) removes the vulnerability by correcting the buffer overflow condition in the DCE/RPC preprocessor. Has Sourcefire received any reports that this vulnerability has been exploited? - No. Sourcefire has not received any reports that this vulnerability has been exploited. Acknowledgments: Sourcefire would like to thank Neel Mehta from IBM X-Force for reporting this issue and working with us to resolve it. ------------------------------------------------------------------------- Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT & business topics through brief surveys-and earn cash http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV _______________________________________________ Snort-announce mailing list Snort-announce@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/snort-announce