medium
6.5
CWE
476
Advisory Published
CVE Published
Updated

CVE-2021-46837: Null Pointer Dereference

First published: Thu Aug 25 2022(Updated: )

res_pjsip_t38 in Sangoma Asterisk 16.x before 16.16.2, 17.x before 17.9.3, and 18.x before 18.2.2, and Certified Asterisk before 16.8-cert7, allows an attacker to trigger a crash by sending an m=image line and zero port in a response to a T.38 re-invite initiated by Asterisk. This is a re-occurrence of the CVE-2019-15297 symptoms but not for exactly the same reason. The crash occurs because there is an append operation relative to the active topology, but this should instead be a replace operation.

Credit: cve@mitre.org

Affected SoftwareAffected VersionHow to fix
Asterisk Certified Asterisk=16.8.0
Asterisk Certified Asterisk=16.8.0-cert1
Asterisk Certified Asterisk=16.8.0-cert2
Asterisk Certified Asterisk=16.8.0-cert3
Asterisk Certified Asterisk=16.8.0-cert4
Asterisk Certified Asterisk=16.8.0-cert5
Asterisk Certified Asterisk=16.8.0-cert6
Digium Asterisk>=16.0.0<16.16.2
Digium Asterisk>=17.0.0<17.9.3
Digium Asterisk>=18.0.0<18.2.2
Debian Debian Linux=9.0
Debian Debian Linux=10.0
Debian Debian Linux=11.0
debian/asterisk<=1:16.2.1~dfsg-1+deb10u2
1:16.28.0~dfsg-0+deb10u4
1:16.28.0~dfsg-0+deb11u3
1:20.5.2~dfsg+~cs6.13.40431414-1

Never miss a vulnerability like this again

Sign up to SecAlerts for real-time vulnerability data matched to your software, aggregated from hundreds of sources.

Read MoreStart Free Trial

Reference Links

Frequently Asked Questions

  • What is the severity of CVE-2021-46837?

    The severity of CVE-2021-46837 is medium with a severity value of 6.5.

  • How does CVE-2021-46837 affect Sangoma Asterisk?

    CVE-2021-46837 affects Sangoma Asterisk versions 16.x before 16.16.2, 17.x before 17.9.3, and 18.x before 18.2.2, and Certified Asterisk before 16.8-cert7.

  • How can an attacker trigger a crash with CVE-2021-46837?

    An attacker can trigger a crash with CVE-2021-46837 by sending an m=image line and zero port in a response to a T.38 re-invite initiated by Asterisk.

  • What is the remedy for CVE-2021-46837?

    The remedy for CVE-2021-46837 is to update to Sangoma Asterisk version 16.16.2, 17.9.3, 18.2.2, or Certified Asterisk version 16.8-cert7.

  • Where can I find more information about CVE-2021-46837?

    More information about CVE-2021-46837 can be found at the following references: https://downloads.asterisk.org/pub/security/AST-2021-006.html, https://security-tracker.debian.org/tracker/CVE-2021-46837, https://security-tracker.debian.org/tracker/CVE-2019-15297

Company

Resources

Contact

SecAlerts Pty Ltd.
132 Wickham Terrace
Fortitude Valley,
QLD 4006, Australia
info@secalerts.co
By using SecAlerts services, you agree to our services end-user license agreement. This website is safeguarded by reCAPTCHA and governed by the Google Privacy Policy and Terms of Service. All names, logos, and brands of products are owned by their respective owners, and any usage of these names, logos, and brands for identification purposes only does not imply endorsement. If you possess any content that requires removal, please get in touch with us.
© 2024 SecAlerts Pty Ltd.
ABN: 70 645 966 203, ACN: 645 966 203