Buffer overflows in libXfont

[J65nko]

X.Org Security Advisory: March 17, 2015

More BDF file parsing issues in libXfont

Description

Ilja van Sprundel, a security researcher with IOActive, has discovered an issue in the parsing of BDF font files by libXfont. Additional testing by Alan Coopersmith and William Robinet with the American Fuzzy Lop (afl) tool uncovered two more issues in the parsing of BDF font files.

As libXfont is used by the X server to read font files, and an unprivileged user with access to the X server can tell the X server to read a given font file from a path of their choosing, these vulnerabilities have the potential to allow unprivileged users to run code with the privileges of the X server (often root access).

For OpenBSD see libXfont Errata

[thirdm]

This is the same person who found all those Xorg bugs a couple years ago and gave that great talk (with a nod to OpenBSD's X server privilege separation design) at CCC:

http://media.ccc.de/browse/congress/..._sprundel.html

Someone buy the man a beer or three.