Ubuntu 4.10 : cyrus21-imapd vulnerability (USN-37-1)
Critical Nessus Plugin ID 20653
SynopsisThe remote Ubuntu host is missing one or more security-related patches.
DescriptionRecently another buffer overflow has been discovered in the SASL authentication module of the Cyrus IMAP server. An off-by-one comparison error in the mysasl_canon_user() function could lead to a missing termination of an user name string.
This vulnerability could allow remote, attacker-supplied machine code to be executed in the context of the affected server process. Since the IMAP server usually runs as unprivileged user 'cyrus', there is no possibility of root privilege escalation.
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.