TITLE:
OpenBSD XFree86 xdm Unintended Query Listening Security Issue

SECUNIA ADVISORY ID:
SA11723

VERIFY ADVISORY:
http://secunia.com/advisories/11723/

CRITICAL:
Less critical

IMPACT:
Security Bypass

WHERE:
>From local network

OPERATING SYSTEM:
OpenBSD 3.x

DESCRIPTION:
OpenBSD has issued an update for xdm. This fixes a security issue,
which potentially may allow malicious users to gain unintended access
to a system.

A CVS version of XFree86 xdm, which is included in some versions of
OpenBSD, has an error that causes it to listen for queries on a
random TCP socket, even though requestPort is set to "0" in the
configuration file.

SOLUTION:
A patch is available for OpenBSD 3.5:
ftp://ftp.openbsd.org/pub/OpenBSD/patches/3.5/common/008_xdm.patch

A fix ("/cvs/xc/programs/xdm/socket.c") has reportedly been committed
to the XFree86 CVS repository.

PROVIDED AND/OR DISCOVERED BY:
Steve Rumble

ORIGINAL ADVISORY:
http://bugs.xfree86.org/show_bug.cgi?id=1376

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