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.
smtp.c in the c-client library in University of Washington IMAP Toolkit 2007b allows remote SMTP servers to cause a denial of service (NULL pointer dereference and application crash) by responding to the QUIT command with a close of the TCP connection instead of the expected 221 response code.
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.
POP2 or POP3 server (pop3d) in imap-uw IMAP package on FreeBSD and other operating systems creates lock files with predictable names, which allows local users to cause a denial of service (lack of mail access) for other users by creating lock files for other mail boxes.
Buffer overflow in University of Washington c-client library (used by pine and other programs) allows remote attackers to execute arbitrary commands via a long X-Keywords header.
Buffer overflow in University of Washington imapd version 4.7 allows users with a valid account to execute commands via LIST or other commands.
Buffer overflow in the pop-2d POP daemon in the IMAP package allows remote attackers to gain privileges via the FOLD command.
Arbitrary command execution via IMAP buffer overflow in authenticate command.
Buffer overflow in University of Washington's implementation of IMAP and POP servers.