Red Hat Bugzilla – Bug 530862
squidGuard: buffer overflow in sgLog.c (CVE-2009-3700) and two URL filter bypass issues (CVE-2009-3826)
Last modified: 2009-11-04 09:00:02 EST
squidGuard upstream has released patches fixing (quoting from upstream advisories): a, This patch fixes one buffer overflow problem in sgLog.c when overlong URLs are requested. SquidGuard will then go into emergency mode were no blocking occurs. This is not required in this situation. URL: http://www.squidguard.org/Downloads/Patches/1.4/Readme.Patch-20091015 ---- b, This patch fixes two bypass problems with URLs which length is close to the limit defined by MAX_BUF (default: 4096) in squidGuard and MAX_URL (default: 4096 in squid 2.x and 8192 in squid 3.x) in squid. For this kind of URLs the proxy request exceeds MAX_BUF causing squidGuard to complain about not being able to parse the squid request. URL: http://www.squidguard.org/Downloads/Patches/1.4/Readme.Patch-20091019 ---- References: ----------- http://secunia.com/advisories/37107/ http://www.securityfocus.com/bid/36800/info http://www.nntpnews.net/f3468/ports-139844-maintainer-update-www-squidguard-fix-security-vulnerabilities-11997445/ Upstream patches - squidGuard 1.4: ---------------------------------- http://www.squidguard.org/Downloads/P.../squidGuard-1.4-patch-20091015.tar.gz http://www.squidguard.org/Downloads/P.../squidGuard-1.4-patch-20091019.tar.gz Upstream advisories: -------------------- http://www.squidguard.org/Downloads/Patches/1.4/Readme.Patch-20091015 http://www.squidguard.org/Downloads/Patches/1.4/Readme.Patch-20091019
These issues affects the versions of the squidGuard package, as shipped with Fedora release of 10 and 11. Please fix.
squidGuard-1.4-8.fc10 has been submitted as an update for Fedora 10. http://admin.fedoraproject.org/updates/squidGuard-1.4-8.fc10
squidGuard-1.4-8.fc11 has been submitted as an update for Fedora 11. http://admin.fedoraproject.org/updates/squidGuard-1.4-8.fc11
CVE-2009-3700: Buffer overflow in sgLog.c in squidGuard 1.3 and 1.4 allows remote attackers to cause a denial of service (application hang or loss of blocking functionality) via a long URL with many / (slash) characters, related to "emergency mode." CVE-2009-3826: Multiple buffer overflows in squidGuard 1.4 allow remote attackers to bypass intended URL blocking via a long URL, related to (1) the relationship between a certain buffer size in squidGuard and a certain buffer size in Squid and (2) a redirect URL that contains information about the originally requested URL.
squidGuard-1.4-8.fc11 has been pushed to the Fedora 11 stable repository. If problems still persist, please make note of it in this bug report.
squidGuard-1.4-8.fc10 has been pushed to the Fedora 10 stable repository. If problems still persist, please make note of it in this bug report.