A vulnerability has been reported in Asterisk, which can be exploited by malicious people to cause a DoS (Denial of Service).
The vulnerability is caused due to an error when handling emails with a malformed MIME body. This can be exploited to crash the service by sending a specially crafted email to a user and tricking him into listening to the voicemail.
Successful exploitation requires that the IMAP backend for the voicemail feature is used. Reportedly, other backends are not affected.
The vulnerability is reported in version 1.4.5 - 1.4.11. Other versions may also be affected.
Solution: Reportedly, this will be fixed in version 1.4.12.
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Subject: Asterisk Voicemail IMAP Backend Invalid MIME Denial of Service
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