LibXfont, TightVNC: Multiple vulnerabilities — GLSA 200705-10

Multiple vulnerabilities have been reported in libXfont and TightVNC, allowing for the execution of arbitrary code with root privileges.

Affected Packages

net-misc/tightvnc on all architectures
Affected versions < 1.2.9-r4
Unaffected versions >= 1.2.9-r4
x11-libs/libXfont on all architectures
Affected versions < 1.2.7-r1
Unaffected versions >= 1.2.7-r1

Background

LibXfont is the X.Org font library. TightVNC is a VNC client/server for X displays.

Description

The libXfont code is prone to several integer overflows, in functions ProcXCMiscGetXIDList(), bdfReadCharacters() and FontFileInitTable(). TightVNC contains a local copy of this code and is also affected.

Impact

A local attacker could use a specially crafted BDF Font to gain root privileges on the vulnerable host.

Workaround

There is no known workaround at this time.

Resolution

All libXfont users should upgrade to the latest version:

 # emerge --sync
 # emerge --ask --oneshot --verbose ">=x11-libs/libXfont-1.2.7-r1"

All TightVNC users should upgrade to the latest version:

 # emerge --sync
 # emerge --ask --oneshot --verbose ">=net-misc/tightvnc-1.2.9-r4"

References

Release Date
May 08, 2007

Latest Revision
May 08, 2007: 01

Severity
high

Exploitable
local

Bugzilla entries