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CVE-2021-26906

Status Candidate

Overview

An issue was discovered in res_pjsip_session.c in Digium Asterisk through 13.38.1; 14.x, 15.x, and 16.x through 16.16.0; 17.x through 17.9.1; and 18.x through 18.2.0, and Certified Asterisk through 16.8-cert5. An SDP negotiation vulnerability in PJSIP allows a remote server to potentially crash Asterisk by sending specific SIP responses that cause an SDP negotiation failure.

Related Files

Asterisk Project Security Advisory - AST-2021-005
Posted Feb 19, 2021
Authored by Joshua Colp, Mauri de Souza Meneguzzo | Site asterisk.org

Given a scenario where an outgoing call is placed from Asterisk to a remote SIP server it is possible for a crash to occur. The code responsible for negotiating SDP in SIP responses incorrectly assumes that SDP negotiation will always be successful. If a SIP response containing an SDP that can not be negotiated is received a subsequent SDP negotiation on the same call can cause a crash.

tags | advisory, remote
advisories | CVE-2021-26906
SHA-256 | a598689c226c0f0b2be7c0f2f5f641be7af78caf65f348109e0446002e06d18f
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