Multiple stack-based buffer overflows in (1) University of Washington IMAP Toolkit 2002 through 2007c, (2) University of Washington Alpine 2.00 and earlier, and (3) Panda IMAP allow (a) local users to gain privileges by specifying a long folder extension argument on the command line to the tmail or dmail program; and (b) remote attackers to execute arbitrary code by sending e-mail to a destination mailbox name composed of a username and '+' character followed by a long string, processed by the tmail or possibly dmail program.

Ludwig Nussel reported a flaw in libc-client / uw-imap:

The rfc822outputchar() function in the uw-imap c-client library does not check whether the buffer is already full and may therefore write one byte too much. This leads to a segfault in rfc822outputdata() later due to memcpy with size -1.

Issue was fixed in imap-2007e: Updated: 16 December 2008

imap-2007e is a maintenance release, consisting primarily of bugfixes to problems discovered in the release that affected a small number of users plus a security fix for users of the RFC822BUFFER routines.