Two vulnerabilities have been reported in Asterisk, which can be exploited by malicious people to cause a DoS (Denial of Service).
1) An error in IAX2 channel driver within the "schedule_delivery()" function (channels/chan_iax2.c) when placing an established call on hold can be exploited to cause a crash via specially crafted packets.
Successful exploitation of this vulnerability requires that the setting mohinterpret=passthrough is set and that the call is placed on hold without a suggested music-on-hold class name.
2) An error in SCCP (Skinny) channel driver (channels/chan_skinny.c) when handling termination of a client's connection can be exploited to cause a crash by closing a connection to the server in certain call states.
The vulnerabilities are reported in versions 1.8.11-cert prior to 1.8.11-cert2, 1.8.x prior to 188.8.131.52, and 10.x prior to 10.4.1.
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Subject: Asterisk Two Denial of Service Vulnerabilities
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