CVE-2021-37706

NameCVE-2021-37706
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 STUN message contains an ERROR-CODE attribute, the header length is not checked before performing a subtraction operation, potentially resulting in an integer underflow scenario. This issue affects all users that use STUN. A malicious actor located within the victim’s network may forge and send a specially crafted UDP (STUN) message that could remotely execute arbitrary code on the victim’s machine. 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+~cs6.12.40431413-1fixed
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)1:18.10.1~dfsg+~cs6.10.40431411-1
pjprojectsourcestretch2.5.5~dfsg-6+deb9u3DLA-2962-1
pjprojectsource(unstable)(unfixed)
ringsource(unstable)(unfixed)

Notes

[stretch] - asterisk <not-affected> (Vulnerable code not present)
https://issues.asterisk.org/jira/browse/ASTERISK-29945
https://downloads.asterisk.org/pub/security/AST-2022-004.html
https://github.com/pjsip/pjproject/security/advisories/GHSA-2qpg-f6wf-w984
https://github.com/pjsip/pjproject/commit/15663e3f37091069b8c98a7fce680dc04bc8e865

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