CVE-2023-49786

NameCVE-2023-49786
DescriptionAsterisk is an open source private branch exchange and telephony toolkit. In Asterisk prior to versions 18.20.1, 20.5.1, and 21.0.1; as well as certified-asterisk prior to 18.9-cert6; Asterisk is susceptible to a DoS due to a race condition in the hello handshake phase of the DTLS protocol when handling DTLS-SRTP for media setup. This attack can be done continuously, thus denying new DTLS-SRTP encrypted calls during the attack. Abuse of this vulnerability may lead to a massive Denial of Service on vulnerable Asterisk servers for calls that rely on DTLS-SRTP. Commit d7d7764cb07c8a1872804321302ef93bf62cba05 contains a fix, which is part of versions 18.20.1, 20.5.1, 21.0.1, amd 18.9-cert6.
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
ReferencesDLA-3696-1, DSA-5596-1
Debian Bugs1059033

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
asterisk (PTS)buster1:16.2.1~dfsg-1+deb10u2vulnerable
buster (security)1:16.28.0~dfsg-0+deb10u4fixed
bullseye1:16.28.0~dfsg-0+deb11u3vulnerable
bullseye (security)1:16.28.0~dfsg-0+deb11u4fixed
sid1:20.8.1~dfsg+~cs6.14.40431414-1fixed

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

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
asterisksourcebuster1:16.28.0~dfsg-0+deb10u4DLA-3696-1
asterisksourcebullseye1:16.28.0~dfsg-0+deb11u4DSA-5596-1
asterisksource(unstable)1:20.5.1~dfsg+~cs6.13.40431414-11059033

Notes

https://github.com/asterisk/asterisk/security/advisories/GHSA-hxj9-xwr8-w8pq
https://github.com/asterisk/asterisk/commit/d7d7764cb07c8a1872804321302ef93bf62cba05
https://www.openwall.com/lists/oss-security/2023/12/15/7

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