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CVE-2021-37706

Published: 22 December 2021

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.

Priority

Medium

Cvss 3 Severity Score

9.8

Score breakdown

Status

Package Release Status
pjproject
Launchpad, Ubuntu, Debian
bionic Needs triage

trusty Ignored
(end of standard support)
upstream Needs triage

xenial Needs triage

ring
Launchpad, Ubuntu, Debian
trusty Ignored
(end of standard support)
xenial Ignored
(end of standard support)
impish Ignored
(end of life)
upstream Needs triage

bionic
Released (20180228.1.503da2b~ds1-1ubuntu0.1~esm1)
Available with Ubuntu Pro
focal
Released (20190215.1.f152c98~ds1-1+deb10u2build0.20.04.1)
lunar
Released (20230206.0~ds1-5ubuntu0.1)
mantic
Released (20230206.0~ds2-1.3ubuntu0.1)

Severity score breakdown

Parameter Value
Base score 9.8
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Scope Unchanged
Confidentiality High
Integrity impact High
Availability impact High
Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H