A vulnerability and a security issue have been reported in Fetchmail, which can be exploited by malicious, local users to cause a DoS (Denial of Service) and by malicious people to gain knowledge of sensitive information.
1) A NULL pointer dereference error in Fetchmail, when refusing a message that was bound for delivery by a message delivery agent (MDA) via the "mda" option, can be exploited to crash the service.
2) Several errors could lead to the authentication in plain text despite the configured settings, resulting in the possibility of passwords being eavesdropped.
The vulnerabilities are reported in version 6.3.5.
Solution: Update to version 6.3.6.
Provided and/or discovered by: The vendor credits:
1) Neil Hoggarth
2) Isaac Wilcox
Original Advisory: 1) http://fetchmail.berlios.de/fetchmail-SA-2006-03.txt
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Subject: Fetchmail TLS Configuration Security Issue and "MDA" Denial of Service
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