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USN-617-2: Samba regression

30 June 2008

Samba regression




USN-617-1 fixed vulnerabilities in Samba. The upstream patch
introduced a regression where under certain circumstances accessing
large files might cause the client to report an invalid packet
length error. This update fixes the problem.

We apologize for the inconvenience.

Original advisory details:

Samba developers discovered that nmbd could be made to overrun
a buffer during the processing of GETDC logon server requests.
When samba is configured as a Primary or Backup Domain Controller,
a remote attacker could send malicious logon requests and possibly
cause a denial of service. (CVE-2007-4572)

Alin Rad Pop of Secunia Research discovered that Samba did not
properly perform bounds checking when parsing SMB replies. A remote
attacker could send crafted SMB packets and execute arbitrary code.

Update instructions

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

Ubuntu 8.04
Ubuntu 7.10
Ubuntu 7.04
Ubuntu 6.06

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