Ubuntu 4.10 : samba vulnerability (USN-29-1)
Critical Nessus Plugin ID 20644
SynopsisThe remote Ubuntu host is missing one or more security-related patches.
DescriptionDuring an audit of the Samba 3.x code base Stefan Esser discovered a Unicode file name buffer overflow within the handling of TRANSACT2_QFILEPATHINFO replies. A malicious samba user with write access to a share could exploit this by creating specially crafted path names (files with very long names containing Unicode characters) that would overflow an internal buffer and could lead to remote execution of arbitrary code with the privileges of the samba server.
Since the samba server usually (by default) runs as root, this flaw can lead to privilege escalation and unbounded system compromise.
Note that Tenable Network Security has extracted the preceding description block directly from the Ubuntu security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.
SolutionUpdate the affected packages.