CVE-2010-2023 Information

Description

transports/appendfile.c in Exim before 4.72 when a world-writable sticky-bit mail directory is used does not verify the st_nlink field of mailbox files which allows local users to cause a denial of service or possibly gain privileges by creating a hard link to another user’s file.

Reference

http://archives.neohapsis.com/archives/fulldisclosure/2010-06/0079.html http://bugs.exim.org/show_bug.cgi?id=988 http://lists.exim.org/lurker/message/20100524.175925.9a69f755.en.html http://lists.fedoraproject.org/pipermail/package-announce/2010-June/042587.html http://lists.fedoraproject.org/pipermail/package-announce/2010-June/042613.html http://lists.opensuse.org/opensuse-security-announce/2010-08/msg00001.html http://secunia.com/advisories/40019 http://secunia.com/advisories/40123 http://secunia.com/advisories/43243 http://vcs.exim.org/viewvc/exim/exim-doc/doc-txt/ChangeLog?view=markup&pathrev=exim-4_72_RC2 http://vcs.exim.org/viewvc/exim/exim-src/src/transports/appendfile.c?r1=1.24&r2=1.25 http://www.securityfocus.com/archive/1/511653/100/0/threaded http://www.securityfocus.com/bid/40451 http://www.ubuntu.com/usn/USN-1060-1 http://www.vupen.com/english/advisories/2010/1402 http://www.vupen.com/english/advisories/2011/0364 https://bugzilla.redhat.com/show_bug.cgi?id=600093 https://exchange.xforce.ibmcloud.com/vulnerabilities/59043