Ubuntu Security Notice USN-310-1
6th July, 2006
ppp vulnerability
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 6.06 LTS
- Ubuntu 5.10
Details
Marcus Meissner discovered that the winbind plugin of pppd does not
check the result of the setuid() call. On systems that configure PAM
limits for the maximum number of user processes and enable the winbind
plugin, a local attacker could exploit this to execute the winbind
NTLM authentication helper as root. Depending on the local winbind
configuration, this could potentially lead to privilege escalation.
Update instructions
The problem can be corrected by updating your system to the following package version:
- Ubuntu 6.06 LTS:
- ppp 2.4.4b1-1ubuntu3.1
- ppp-udeb 2.4.4b1-1ubuntu3.1
- ppp-dev 2.4.4b1-1ubuntu3.1
- Ubuntu 5.10:
- ppp 2.4.3-20050321+2ubuntu1.1
- ppp-udeb 2.4.3-20050321+2ubuntu1.1
- ppp-dev 2.4.3-20050321+2ubuntu1.1
To update your system, please follow these instructions: https://wiki.ubuntu.com/Security/Upgrades.
In general, a standard system upgrade is sufficient to effect the
necessary changes.