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LibXfont, TightVNC: Multiple vulnerabilities


1.  Gentoo Linux Security Advisory

Version Information

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


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

2.  Impact Information


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


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.


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

3.  Resolution Information


There is no known workaround at this time.


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


Page updated May 08, 2007

Summary: This is a Gentoo Linux Security Advisory

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