CVE-2021-43804: Out-of-bounds read when parsing RTCP BYE message in PJSIP
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.
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade
ubuntu/ringto a version that resolves this vulnerability.Fixed in 20180228.1.503 - Upgrade
Upgrade
ubuntu/ringto a version that resolves this vulnerability.Fixed in 20190215.1. - Upgrade
Upgrade
debian/asteriskto a version that resolves this vulnerability.Fixed in 1:22.10.1+dfsg+~cs6.17.60671434-1 - Upgrade
Upgrade
debian/ringto a version that resolves this vulnerability.Fixed in 20230206.0~ds2-1.1+deb12u1
Event History
Peer vulnerabilities
Found alongside the following vulnerabilities.
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.