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<?xml version="1.0" encoding="utf-8"?>
<glsa id="200710-11">
<title>X Font Server: Multiple Vulnerabilities</title>
Three vulnerabilities have been discovered in the X Font Server possibly
allowing local attackers to gain elevated privileges.
<product type="ebuild">xfs</product>
<announced>October 12, 2007</announced>
<revised>October 12, 2007: 01</revised>
<package name="x11-apps/xfs" auto="yes" arch="*">
<unaffected range="ge">1.0.5</unaffected>
<vulnerable range="lt">1.0.5</vulnerable>
The X.Org X11 X Font Server provides a standard mechanism for an X
server to communicate with a font renderer.
iDefense reported that the xfs init script does not correctly handle a
race condition when setting permissions of a temporary file
(CVE-2007-3103). Sean Larsson discovered an integer overflow
vulnerability in the build_range() function possibly leading to a
heap-based buffer overflow when handling "QueryXBitmaps" and
"QueryXExtents" protocol requests (CVE-2007-4568). Sean Larsson also
discovered an error in the swap_char2b() function possibly leading to a
heap corruption when handling the same protocol requests
<impact type="high">
The first issue would allow a local attacker to change permissions of
arbitrary files to be world-writable by performing a symlink attack.
The second and third issues would allow a local attacker to execute
arbitrary code with privileges of the user running the X Font Server,
usually xfs.
There is no known workaround at this time.
All X Font Server users should upgrade to the latest version:
# emerge --sync
# emerge --ask --oneshot --verbose &quot;&gt;=x11-apps/xfs-1.0.5&quot;</code>
<uri link="">CVE-2007-3103</uri>
<uri link="">CVE-2007-4568</uri>
<uri link="">CVE-2007-4990</uri>
<metadata tag="requester" timestamp="Thu, 11 Oct 2007 20:30:03 +0000">
<metadata tag="submitter" timestamp="Thu, 11 Oct 2007 21:39:17 +0000">
<metadata tag="bugReady" timestamp="Thu, 11 Oct 2007 21:39:34 +0000">