LibXfont, TightVNC: Multiple vulnerabilities

1. Gentoo Linux Security Advisory

Advisory Reference	GLSA 200705-10 / tightvnc, libxfont
Release Date	May 08, 2007
Latest Revision	May 08, 2007: 01
Impact	high
Exploitable	local

Package	Vulnerable versions	Unaffected versions	Architecture(s)
net-misc/tightvnc	< 1.2.9-r4	>= 1.2.9-r4	All supported architectures
x11-libs/libXfont	< 1.2.7-r1	>= 1.2.7-r1	All supported architectures

Related bugreports: #172575, #174200

Synopsis

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

2. Impact Information

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.

3. Resolution Information

Workaround

There is no known workaround at this time.

Resolution

All libXfont users should upgrade to the latest version:

Code Listing 3.1: Resolution

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

All TightVNC users should upgrade to the latest version:

Code Listing 3.2: Resolution

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

4. References

Updated May 08, 2007

Summary: This is a Gentoo Linux Security Advisory

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