CVE-2021-43804

NameCVE-2021-43804
DescriptionPJSIP 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.
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, bugtraq, EDB, Metasploit, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, Mageia, GitHub code/issues, web search, more)
ReferencesDLA-2962-1

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
asterisk (PTS)stretch1:13.14.1~dfsg-2+deb9u4fixed
stretch (security)1:13.14.1~dfsg-2+deb9u6fixed
buster1:16.2.1~dfsg-1+deb10u2vulnerable
bullseye1:16.16.1~dfsg-1vulnerable
bullseye (security)1:16.16.1~dfsg-1+deb11u1vulnerable
bookworm, sid1:18.12.0~dfsg+~cs6.12.40431413-1vulnerable
pjproject (PTS)stretch2.5.5~dfsg-6+deb9u1vulnerable
stretch (security)2.5.5~dfsg-6+deb9u5fixed
ring (PTS)stretch20161221.2.7bd7d91~dfsg1-1vulnerable
stretch (security)20161221.2.7bd7d91~dfsg1-1+deb9u1vulnerable
buster20190215.1.f152c98~ds1-1+deb10u1vulnerable
sid, bullseye20210112.2.b757bac~ds1-1vulnerable

The information below is based on the following data on fixed versions.

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
asterisksourcestretch(not affected)
asterisksource(unstable)(unfixed)
pjprojectsourcestretch2.5.5~dfsg-6+deb9u3DLA-2962-1
pjprojectsource(unstable)(unfixed)
ringsource(unstable)(unfixed)

Notes

[stretch] - asterisk <not-affected> (Vulnerable code not present)
https://github.com/pjsip/pjproject/security/advisories/GHSA-3qx3-cg72-wrh9
https://github.com/pjsip/pjproject/commit/8b621f192cae14456ee0b0ade52ce6c6f258af1e

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