Vulnerability Monitor

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CVE-2023-49786

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.

Published

2023-12-14T20:15:52.927

Last Modified

2024-11-21T08:33:50.533

Status

Modified

Source

[email protected]

Severity

CVSSv3.1: 7.5 (HIGH)

Weaknesses

Type: Secondary
CWE-703
Type: Primary
CWE-362

Affected Vendors & Products

Type	Vendor	Product	Version/Range	Vulnerable?
Application	digium	asterisk	< 18.20.1	Yes
Application	digium	asterisk	< 20.5.1	Yes
Application	digium	asterisk	21.0.0	Yes
Application	sangoma	certified_asterisk	13.13.0	Yes
Application	sangoma	certified_asterisk	13.13.0	Yes
Application	sangoma	certified_asterisk	13.13.0	Yes
Application	sangoma	certified_asterisk	13.13.0	Yes
Application	sangoma	certified_asterisk	13.13.0	Yes
Application	sangoma	certified_asterisk	13.13.0	Yes
Application	sangoma	certified_asterisk	13.13.0	Yes
Application	sangoma	certified_asterisk	13.13.0	Yes
Application	sangoma	certified_asterisk	13.13.0	Yes
Application	sangoma	certified_asterisk	13.13.0	Yes
Application	sangoma	certified_asterisk	16.8.0	Yes
Application	sangoma	certified_asterisk	16.8.0	Yes
Application	sangoma	certified_asterisk	16.8.0	Yes
Application	sangoma	certified_asterisk	16.8.0	Yes
Application	sangoma	certified_asterisk	16.8.0	Yes
Application	sangoma	certified_asterisk	16.8.0	Yes
Application	sangoma	certified_asterisk	16.8.0	Yes
Application	sangoma	certified_asterisk	16.8.0	Yes
Application	sangoma	certified_asterisk	16.8.0	Yes
Application	sangoma	certified_asterisk	16.8.0	Yes
Application	sangoma	certified_asterisk	16.8.0	Yes
Application	sangoma	certified_asterisk	16.8.0	Yes
Application	sangoma	certified_asterisk	16.8.0	Yes
Application	sangoma	certified_asterisk	18.9	Yes
Application	sangoma	certified_asterisk	18.9	Yes
Application	sangoma	certified_asterisk	18.9	Yes
Application	sangoma	certified_asterisk	18.9	Yes
Application	sangoma	certified_asterisk	18.9	Yes

References

http://packetstormsecurity.com/files/176251/Asterisk-20.1.0-Denial-Of-Service.html Exploit, Third Party Advisory, VDB Entry ([email protected])
http://seclists.org/fulldisclosure/2023/Dec/24 Exploit, Mailing List, Third Party Advisory ([email protected])
http://www.openwall.com/lists/oss-security/2023/12/15/7 Exploit, Mailing List ([email protected])
https://github.com/EnableSecurity/advisories/tree/master/ES2023-01-asterisk-dtls-hello-race Exploit ([email protected])
https://github.com/asterisk/asterisk/commit/d7d7764cb07c8a1872804321302ef93bf62cba05 Patch ([email protected])
https://github.com/asterisk/asterisk/security/advisories/GHSA-hxj9-xwr8-w8pq Exploit, Vendor Advisory ([email protected])
https://lists.debian.org/debian-lts-announce/2023/12/msg00019.html ([email protected])
http://packetstormsecurity.com/files/176251/Asterisk-20.1.0-Denial-Of-Service.html Exploit, Third Party Advisory, VDB Entry (af854a3a-2127-422b-91ae-364da2661108)
http://seclists.org/fulldisclosure/2023/Dec/24 Exploit, Mailing List, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
http://www.openwall.com/lists/oss-security/2023/12/15/7 Exploit, Mailing List (af854a3a-2127-422b-91ae-364da2661108)
https://github.com/EnableSecurity/advisories/tree/master/ES2023-01-asterisk-dtls-hello-race Exploit (af854a3a-2127-422b-91ae-364da2661108)
https://github.com/asterisk/asterisk/commit/d7d7764cb07c8a1872804321302ef93bf62cba05 Patch (af854a3a-2127-422b-91ae-364da2661108)
https://github.com/asterisk/asterisk/security/advisories/GHSA-hxj9-xwr8-w8pq Exploit, Vendor Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://lists.debian.org/debian-lts-announce/2023/12/msg00019.html (af854a3a-2127-422b-91ae-364da2661108)