Headline
CVE-2021-43804: Potential out-of-bounds read when parsing RTCP BYE message
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.
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.
Impact
It affects all users that use PJMEDIA and RTCP. A malicious actor can send a RTCP BYE message with an invalid reason length.
Patches
The patch is available as commit 8b621f1 in the master branch.
For more information
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