The X.org fix for CVE-2007-6429 introduced a regression in the MIT-SHM extension, which prevented the start of a few applications. This update provides updated packages for the xfree86 version included in Debian old stable (sarge) in addition to the fixed packages for Debian stable (etch), which were provided in DSA 1466-2.
For reference the original advisory text below:
Several local vulnerabilities have been discovered in the X.Org X server. The Common Vulnerabilities and Exposures project identifies the following problems:
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discovered that missing input sanitising within
the XFree86-Misc extension may lead to local privilege escalation.
It was discovered that error messages of security policy file handling may lead to a minor information leak disclosing the existance of files otherwise unaccessible to the user.
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discovered that missing input sanitising within
the XInput-Misc extension may lead to local privilege escalation.
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discovered that missing input sanitising within
the TOG-CUP extension may lead to disclosure of memory contents.
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discovered that integer overflows in the EVI
and MIT-SHM extensions may lead to local privilege escalation.
It was discovered that insufficient validation of PCF fonts could lead to local privilege escalation.
For the oldstable distribution (sarge), this problem has been fixed in version 4.3.0.dfsg.1-14sarge7 of xfree86.
For the stable distribution (etch), this problem has been fixed in version 1.1.1-21etch3 of xorg-server and 1.2.2-2.etch1 of libxfont.
For the unstable distribution (sid), this problem has been fixed in version 2:1.4.1~git20080118-1 of xorg-server and version 1:1.3.1-2 of libxfont.
We recommend that you upgrade your X.org/Xfree86 packages.