USN-1262-1: Light Display Manager vulnerabilities

Releases

• Ubuntu 11.10

Packages

• lightdm - Display Manager

Details

It was discovered that Light Display Manager incorrectly handled privileges
when reading .dmrc files. A local attacker could exploit this issue to read
arbitrary configuration files, bypassing intended permissions.
(CVE-2011-3153)

It was discovered that Light Display Manager incorrectly handled links when
adjusting permissions on .Xauthority files. A local attacker could exploit
this issue to access arbitrary files, and possibly obtain increased
privileges. In the default Ubuntu installation, this would be prevented
by the Yama link restrictions. (CVE-2011-4105)

Update instructions

The problem can be corrected by updating your system to the following package versions:

Ubuntu 11.10

• liblightdm-gobject-1-0 - 1.0.6-0ubuntu1.1
• liblightdm-qt-1-0 - 1.0.6-0ubuntu1.1
• lightdm - 1.0.6-0ubuntu1.1

After a standard system update you need to reboot your computer to make
all the necessary changes.

References

• CVE-2011-3153
• CVE-2011-4105