Two vulnerabilities have been reported in Asterisk, which can be exploited by malicious people to cause a DoS (Denial of Service).
1) The Asterisk Manager Interface does not properly handle failed writes to manager clients, which can be exploited to cause a CPU and memory exhaustion by opening, sending invalid data, and closing multiple connections in a short period of time.
Successful exploitation requires that the manager interface is enabled (disabled by default).
2) A NULL pointer dereference error within the "handle_tcptls_connection()" function in main/tcptls.c can be exploited to cause a crash by opening multiple connections to services using the "ast_tcptls_*" API (e.g. chan_sip, manager, and res_phoneprov) in a short period of time.
The vulnerabilities are reported in Asterisk Open Source versions 1.6.1.x prior to 188.8.131.52, 1.6.2.x prior to 184.108.40.206.1, and 1.8.x prior to 220.127.116.11.
Solution: Update to versions 18.104.22.168, 22.214.171.124.1, or 126.96.36.199 or apply patches.
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Subject: Asterisk Two Denial of Service Vulnerabilities
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