During an audit, a critical vulnerability has been discovered in the MDaemon POP3 server. There is a buffer overflow vulnerability in ‘USER’ and ‘APOP’ command processing part of the Altn MDaemon POP3 server. The vulnerability can be triggered with providing a long string to USER or APOP commands with ‘@’ characters included in the string. In this case, MDaemon will incorectly process the string and a heap overflow will happen as a result. To trigger the vulnerability, a few USER commands have to be sent to the POP3 Server. Sometimes (depending on the heap state and string length), it is even possible to redirect code execution directly to the supplied input buffer on the heap. MDaemon versions 8 and 9 are confirmed vulnerable.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/49442/INFIGO-2006-08-04.txt
Source: https://packetstormsecurity.com/files/49442/INFIGO-2006-08-04.txt.html