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CVE-2021-37706

Status Candidate

Overview

PJSIP is a free and open source multimedia communication library written in C language implementing standard based protocols such as SIP, SDP, RTP, STUN, TURN, and ICE. In affected versions if the incoming STUN message contains an ERROR-CODE attribute, the header length is not checked before performing a subtraction operation, potentially resulting in an integer underflow scenario. This issue affects all users that use STUN. A malicious actor located within the victim’s network may forge and send a specially crafted UDP (STUN) message that could remotely execute arbitrary code on the victim’s machine. Users are advised to upgrade as soon as possible. There are no known workarounds.

Related Files

Asterisk Project Security Advisory - AST-2022-004
Posted Mar 7, 2022
Authored by Kevin Harwell, Sauw Ming | Site asterisk.org

The header length on incoming STUN messages that contain an ERROR-CODE attribute is not properly checked. This can result in an integer underflow. Note, this requires ICE or WebRTC support to be in use with a malicious remote party.

tags | advisory, remote
advisories | CVE-2021-37706
SHA-256 | b4d958ee6e32f6f622c4ae3b0cd99a1c00dcde4578e8d8eca299633634cfec4c
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