CVE-2021-37706 Potential integer underflow upon receiving STUN message in PJSIP

2021-12-2200:00:00

CWE-191

GitHub_M

www.cve.org

pjsip

multimedia communication

integer underflow

stun

protocol

udp

arbitrary code

CVSS3

7.3

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

LOW

Integrity Impact

LOW

Availability Impact

LOW

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

AI Score

9.8

Confidence

High

EPSS

0.022

Percentile

89.6%

JSON

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.

CNA Affected

[
  {
    "vendor": "pjsip",
    "product": "pjproject",
    "versions": [
      {
        "version": "<= 2.11.1",
        "status": "affected"
      }
    ]
  }
]