CVEvulnerability
CVE-2023-49786
5.9 MEDIUM
Official page ↗
- Status
- Modified
- Published
- 2023-12-14
- Last modified
- 2026-06-17
- Assigner
- [email protected]
- CVSS 3.1 ([email protected])
- 7.5 HIGH — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- CVSS 3.1 ([email protected])
- 5.9 MEDIUM — CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
- Weaknesses
- CWE-362, CWE-703
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.
Affected configurations
• digium asterisk (< 18.20.1)
• digium asterisk (>= 19.0.0 < 20.5.1)
• digium asterisk 21.0.0
• sangoma certified asterisk 13.13.0
• sangoma certified asterisk 16.8.0
• sangoma certified asterisk 18.9
Related
References
- http://packetstormsecurity.com/files/176251/Asterisk-20.1.0-Denial-Of-Service.html Exploit, Third Party Advisory, VDB Entry
- http://seclists.org/fulldisclosure/2023/Dec/24 Exploit, Mailing List, Third Party Advisory
- http://www.openwall.com/lists/oss-security/2023/12/15/7 Exploit, Mailing List
- https://github.com/EnableSecurity/advisories/tree/master/ES2023-01-asterisk-dtls-hello-race Exploit
- https://github.com/asterisk/asterisk/commit/d7d7764cb07c8a1872804321302ef93bf62cba05 Patch
- https://github.com/asterisk/asterisk/security/advisories/GHSA-hxj9-xwr8-w8pq Exploit, Vendor Advisory
- https://lists.debian.org/debian-lts-announce/2023/12/msg00019.html lists.debian.org
- http://packetstormsecurity.com/files/176251/Asterisk-20.1.0-Denial-Of-Service.html Exploit, Third Party Advisory, VDB Entry
- http://seclists.org/fulldisclosure/2023/Dec/24 Exploit, Mailing List, Third Party Advisory
- http://www.openwall.com/lists/oss-security/2023/12/15/7 Exploit, Mailing List
- https://github.com/EnableSecurity/advisories/tree/master/ES2023-01-asterisk-dtls-hello-race Exploit
- https://github.com/asterisk/asterisk/commit/d7d7764cb07c8a1872804321302ef93bf62cba05 Patch
- https://github.com/asterisk/asterisk/security/advisories/GHSA-hxj9-xwr8-w8pq Exploit, Vendor Advisory
- https://lists.debian.org/debian-lts-announce/2023/12/msg00019.html lists.debian.org