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USN-310-1: ppp vulnerability

6 July 2006

ppp vulnerability



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 versions:

Ubuntu 6.06
  • 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

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