Two vulnerabilities have been reported in Asterisk, which can be exploited by malicious users to bypass certain security restrictions and by malicious people to cause a DoS (Denial of Service).
1) The application does not properly limit the number of simultaneous TCP connections to e.g. the Asterisk Manager Interface, Skinny, SIP over TCP, or the built in HTTP server, which can be exploited to exhaust all available file descriptors and stop Asterisk from processing new calls.
2) An error within the Asterisk Manager Interface when handling "Originate" actions can be exploited to bypass a certain security check and execute arbitrary shell commands by sending an "Originate" action with both the "Async" and "Application" headers.
Successful exploitation requires that the attacker is an authenticated manager user.
The vulnerabilities are reported in Asterisk Open Source prior to versions 220.127.116.11, 18.104.22.168, 22.214.171.124.3, and 126.96.36.199 and Asterisk Business Edition prior to version C.3.6.4
Solution: Update to a fixed version or apply patches. Set limits for unauthenticated connections.
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Subject: Asterisk Security Bypass and Denial of Service Vulnerabilities
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