| Name | CVE-2023-49786 |
| Description | Asterisk 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. |
| Source | CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more) |
| References | DLA-3696-1, DSA-5596-1 |
| Debian Bugs | 1059033 |
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|---|---|---|
| asterisk (PTS) | bullseye | 1:16.28.0~dfsg-0+deb11u4 | fixed |
| bullseye (security) | 1:16.28.0~dfsg-0+deb11u5 | fixed | |
| sid | 1:22.1.0~dfsg+~cs6.14.60671435-1 | fixed |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|---|---|---|---|---|---|
| asterisk | source | buster | 1:16.28.0~dfsg-0+deb10u4 | DLA-3696-1 | ||
| asterisk | source | bullseye | 1:16.28.0~dfsg-0+deb11u4 | DSA-5596-1 | ||
| asterisk | source | (unstable) | 1:20.5.1~dfsg+~cs6.13.40431414-1 | 1059033 |
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