Multiple vulnerabilities have been reported in Asterisk, which can be exploited by malicious people to cause a DoS (Denial of Service).
1) An input validation error in the "sipsock_read()" function (channels/chan_sip.c) when processing requests containing a NULL byte can be exploited to corrupt memory and cause a crash via a specially crafted SIP packet.
2) A NULL pointer dereference error in the "get_in_brackets_full()" function (channels/sip/reqresp_parser.c) can be exploited to cause a crash via a specially crafted SIP "Contact" header.
3) An input validation error in the IAX2 channel driver (channels/chan_iax2.c) within the "iax2_setoption()" function can be exploited to access an invalid pointer supplied via a specially crafted option control frame.
Please see the vendor's advisory for a list of affected versions.
Solution: Apply updates or patches. Please see the vendor's advisory for details.
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Subject: Asterisk Multiple Denial of Service Vulnerabilities
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