A vulnerability has been reported in Asterisk, which can be exploited by malicious users to cause a DoS (Denial of Service) and potentially compromise a vulnerable system.
The vulnerability is caused due to a boundary error within the "ast_uri_encode()" function in main/utils.c. This can be exploited to e.g. cause a stack-based buffer overflow by sending specially crafted caller ID information.
Successful exploitation may require that the SIP channel driver is configured with the "pedantic" option enabled.
The vulnerability is reported in Asterisk Open Source Edition prior to versions 18.104.22.168, 22.214.171.124, 126.96.36.199, 188.8.131.52.1, 184.108.40.206.1, 220.127.116.11, and 18.104.22.168 and Asterisk Business Edition prior to version C.3.6.2.
Solution: Update to a fixed version or apply patches.
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