CyberSecBulletin
CVE-2022-21723NVD status: Modified

pjproject: Out-of-bounds Read

Published Updated By the CyberSecBulletin desk

CVE-2022-21723 is a critical-severity out-of-bounds read vulnerability in pjproject from Pjsip, with a CVSS 3.1 base score of 9.1 out of 10. It can be exploited remotely over the network by an unauthenticated attacker, without any action from a user. Affected pjproject versions: <= 2.11.1. The record does not name a fixed version, so check the vendor advisory. There is no confirmed exploitation so far. EPSS estimates a 4.36% chance of exploitation within 30 days, which is in the top 8.61% of all scored CVEs.

Patch this week

Critical severity: a successful attack would have severe impact.

What to do

  1. Update Asterisk to 16.24.1 or 18.10.1 or 19.2.1, whichever matches your release line, or a later version.
  2. Read the advisory on packetstormsecurity.com for workarounds and exact fixed builds.
  3. Until you can update, restrict network access to the affected service so it is not reachable from untrusted networks.

Affected products and versions

VendorProductAffected versionsFixed in
Pjsippjproject<= 2.11.1Not stated
TeluuPjsip2.11.1 and earlierNot stated
AsteriskCertified Asterisk16.8.0Not stated
SangomaAsterisk16.0.0 up to, but not including, 16.24.1; 18.0.0 up to, but not including, 18.10.1; 19.0.0 up to, but not including, 19.2.116.24.1, 18.10.1, 19.2.1
DebianDebian Linux9.0; 10.0Not stated

Version data comes from the organisation that assigned the CVE. Confirm against the vendor advisory before deciding you are unaffected.

How the severity score breaks down

Attack vector
NetworkCan be exploited remotely over a network, including the internet.
Attack complexity
LowNo special conditions are needed; the attack works reliably.
Privileges required
NoneNo account or login is needed.
User interaction
NoneNo action by a victim is required.
Scope
UnchangedImpact stays within the vulnerable component.
Confidentiality
HighAll data handled by the component can be read.
Integrity
NoneNothing can be modified.
Availability
HighThe component can be taken down completely.

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H. Scored by NVD.

Scoring systemScoreSeverityScored by
CVSS 3.19.1CriticalCNA (github.com)
CVSS 3.19.1CriticalNVD
CVSS 2.06.4MediumNVD

Official 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 versions 2.11.1 and prior, parsing an incoming SIP message that contains a malformed multipart can potentially cause out-of-bound read access. This issue affects all PJSIP users that accept SIP multipart. The patch is available as commit in the `master` branch. There are no known workarounds.

Source: the CVE record as published by its numbering authority, via NVD and CVE.org.

The underlying weakness: Out-of-bounds Read

The product reads data past the end, or before the beginning, of the intended buffer.

How developers prevent this class of flaw

  • Use a language that provides appropriate memory abstractions.

More Out-of-bounds Read vulnerabilities (CWE-125)

Timeline

  1. CVE record published.
  2. CISA published its SSVC assessment (exploitation: none, automatable: yes, technical impact: partial).
  3. Record last changed materially (score, affected products, status or references).

References

Patches and release notes

Third-party and government advisories

Other vulnerabilities in pjproject

All pjproject vulnerabilities

Recent Out-of-bounds Read vulnerabilities

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