Vigil@nce: UW IMAP, buffer overflow of dmail/tmail
November 2008 by Vigil@nce
In some cases, an attacker can create an overflow in dmail/tmail commands of UW IMAP in order to execute code.
Consequences: privileged access/rights
Provenance: user shell
Means of attack: no proof of concept, no attack
Ability of attacker: expert (4/4)
Confidence: confirmed by the editor (5/5)
Diffusion of the vulnerable configuration: medium (2/3)
Creation date: 03/11/2008
Unix - plateform
The UW IMAP suite offers the dmail and tmail programs to transmit emails to user’s mailbox, or to a chosen directory. For example: dmail user+directory tmail user+directory
However, if the directory name is too long, a buffer overflow occurs. To exploit this vulnerability, the dmail/tmail program has to be installed suid or sgid.
An attacker can thus obtain privileges of the user (suid) or of the group (sgid).
Identifiers: bsa-081103, VIGILANCE-VUL-8216