CVE-2021-37706 Information

Description

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.

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Reference

https://github.com/pjsip/pjproject/security/advisories/GHSA-2qpg-f6wf-w984 https://github.com/pjsip/pjproject/commit/15663e3f37091069b8c98a7fce680dc04bc8e865 http://seclists.org/fulldisclosure/2022/Mar/0 http://packetstormsecurity.com/files/166225/Asterisk-Project-Security-Advisory-AST-2022-004.html https://lists.debian.org/debian-lts-announce/2022/03/msg00035.html

Attack Complexity

LOW

Privileges Required

NONE

User Interaction Required

NONE

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

HIGH

Availability Impact

HIGH

Base Score

HIGH

Base Severity

9.8