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Gentoo Linux Security Advisory 200808-12
Posted Aug 15, 2008
Authored by Gentoo | Site security.gentoo.org

Gentoo Linux Security Advisory GLSA 200808-12 - Sebastian Krahmer of SuSE has found that Postfix allows to deliver mail to root-owned symlinks in an insecure manner under certain conditions. Normally, Postfix does not deliver mail to symlinks, except to root-owned symlinks, for compatibility with the systems using symlinks in /dev like Solaris. Furthermore, some systems like Linux allow to hardlink a symlink, while the POSIX.1-2001 standard requires that the symlink is followed. Depending on the write permissions and the delivery agent being used, this can lead to an arbitrary local file overwriting vulnerability (CVE-2008-2936). Furthermore, the Postfix delivery agent does not properly verify the ownership of a mailbox before delivering mail (CVE-2008-2937). Versions less than 2.5.3-r1 are affected.

tags | advisory, arbitrary, local, root
systems | linux, solaris, suse, osx, gentoo
advisories | CVE-2008-2936, CVE-2008-2937
SHA-256 | d497bc162a46389e6722a35709f7ab1c3bd832aedc68b2878c475b7a46f79038

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