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USN-695-1: shadow vulnerability

18 December 2008

shadow vulnerability




Paul Szabo discovered a race condition in login. While setting up
tty permissions, login did not correctly handle symlinks. If a local
attacker were able to gain control of the system utmp file, they could
cause login to change the ownership and permissions on arbitrary files,
leading to a root privilege escalation.

Update instructions

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

Ubuntu 8.10
Ubuntu 8.04
Ubuntu 7.10
Ubuntu 6.06

In general, a standard system upgrade is sufficient to effect the
necessary changes.