CVE-2021-43804: Out-of-bounds read when parsing RTCP BYE message in PJSIP
First published: Wed Dec 22 2021(Updated: )
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 RTCP BYE message contains a reason's length, this declared length is not checked against the actual received packet size, potentially resulting in an out-of-bound read access. This issue affects all users that use PJMEDIA and RTCP. A malicious actor can send a RTCP BYE message with an invalid reason length. Users are advised to upgrade as soon as possible. There are no known workarounds.
Credit: security-advisories@github.com security-advisories@github.com security-advisories@github.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Teluu PJSIP | <=2.11.1 | |
| Debian Debian Linux | =9.0 | |
| Debian Debian Linux | =10.0 | |
| ubuntu/ring | <20180228.1.503 | 20180228.1.503 |
| ubuntu/ring | <20190215.1. | 20190215.1. |
| debian/asterisk | 1:16.28.0~dfsg-0+deb10u4 1:16.28.0~dfsg-0+deb11u3 1:16.28.0~dfsg-0+deb11u4 1:20.6.0~dfsg+~cs6.13.40431414-2 | |
| debian/ring | <=20190215.1.f152c98~ds1-1+deb10u1<=20210112.2.b757bac~ds1-1 | 20190215.1.f152c98~ds1-1+deb10u2 20230206.0~ds2-1.1 20231201.0~ds1-1 |
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Reference Links
- https://github.com/pjsip/pjproject/commit/8b621f192cae14456ee0b0ade52ce6c6f258af1e
- https://github.com/pjsip/pjproject/security/advisories/GHSA-3qx3-cg72-wrh9
- https://lists.debian.org/debian-lts-announce/2022/03/msg00035.html
- https://lists.debian.org/debian-lts-announce/2022/11/msg00021.html
- https://lists.debian.org/debian-lts-announce/2023/08/msg00038.html
- https://security.gentoo.org/glsa/202210-37
- https://www.debian.org/security/2022/dsa-5285
- https://launchpad.net/bugs/cve/CVE-2021-43804
- https://security-tracker.debian.org/tracker/CVE-2021-43804
- https://ubuntu.com/security/notices/USN-6422-1
- https://www.cve.org/CVERecord?id=CVE-2021-43804
- https://nvd.nist.gov/vuln/detail/CVE-2021-43804
- https://ubuntu.com/security/CVE-2021-43804
Frequently Asked Questions
What is CVE-2021-43804?
CVE-2021-43804 is a vulnerability in the PJSIP multimedia communication library that allows remote attackers to cause a denial of service (DoS) by sending a specially crafted RTCP BYE message.
How severe is CVE-2021-43804?
CVE-2021-43804 has a severity rating of 7.3, which is considered high.
Which software versions are affected by CVE-2021-43804?
The affected software versions include Teluu Pjsip up to version 2.11.1, Debian Debian Linux version 9.0 and 10.0, and Asterisk version up to 1:16.2.1~dfsg-1+deb10u2.
How can I fix CVE-2021-43804?
To fix CVE-2021-43804, update to the latest version of PJSIP, Debian Linux, or Asterisk, depending on your affected software.
Is there any additional information about CVE-2021-43804?
Yes, you can find additional information about CVE-2021-43804 in the provided references.
- collector/nvd-api
- collector/nvd-index
- agent/type
- agent/remedy
- collector/launchpad-cve
- source/Launchpad
- agent/first-publish-date
- collector/nvd-cve
- source/NVD
- agent/software-canonical-lookup
- agent/weakness
- agent/author
- agent/description
- collector/security-tracker-debian
- source/Debian
- agent/softwarecombine
- collector/usn-cve
- source/Ubuntu
- agent/references
- collector/mitre-cve
- source/MITRE
- agent/severity
- agent/last-modified-date
- agent/title
- agent/tags
- agent/event
- vendor/teluu
- canonical/teluu pjsip
- version/teluu pjsip/2.11.1
- vendor/debian
- canonical/debian debian linux
- version/debian debian linux/9.0
- version/debian debian linux/10.0
- package-manager/debian
- package-manager/ubuntu