Postfix 2.4 before 2.4.9, 2.5 before 2.5.5, and 2.6 before 2.6-20080902, when used with the Linux 2.6 kernel, leaks epoll file descriptors during execution of "non-Postfix" commands, which allows local users to cause a denial of service (application slowdown or exit) via a crafted command, as demonstrated by a command in a .forward file.

References

• https://nvd.nist.gov/vuln/detail/CVE-2008-3889
• https://exchange.xforce.ibmcloud.com/vulnerabilities/44865
• https://www.exploit-db.com/exploits/6472
• https://www.redhat.com/archives/fedora-package-announce/2008-October/msg00271.html
• https://www.redhat.com/archives/fedora-package-announce/2008-October/msg00287.html
• http://lists.opensuse.org/opensuse-security-announce/2008-09/msg00004.html
• http://secunia.com/advisories/31716
• http://secunia.com/advisories/31800
• http://secunia.com/advisories/31982
• http://secunia.com/advisories/31986
• http://secunia.com/advisories/32231
• http://security.gentoo.org/glsa/glsa-200809-09.xml
• http://securityreason.com/securityalert/4239
• http://securitytracker.com/id?1020800
• http://wiki.rpath.com/wiki/Advisories:rPSA-2008-0311
• http://www.mandriva.com/security/advisories?name=MDVSA-2008:190
• http://www.postfix.org/announcements/20080902.html
• http://www.securityfocus.com/archive/1/495894/100/0/threaded
• http://www.securityfocus.com/archive/1/496420/100/0/threaded
• http://www.securityfocus.com/archive/1/498037/100/0/threaded
• http://www.securityfocus.com/bid/30977
• http://www.ubuntu.com/usn/usn-642-1
• http://www.wekk.net/research/CVE-2008-3889/