CVE-2023-49786
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…
Does this matter?
Lower severity and a low EPSS score (5.34%). Track it; it rarely justifies an emergency change on its own.
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.
- CVSS 3.1
- 5.9 MEDIUMCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
- EPSS
- 5.34% probability · 92th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-703, CWE-362
- Affected
- digium/asterisk · sangoma/certified asterisk
- Source
- security-advisories@github.com
References
- http://packetstormsecurity.com/files/176251/Asterisk-20.1.0-Denial-Of-Service.htmlExploit, Third Party Advisory, VDB Entry
- http://seclists.org/fulldisclosure/2023/Dec/24Exploit, Mailing List, Third Party Advisory
- http://www.openwall.com/lists/oss-security/2023/12/15/7Exploit, Mailing List
- https://github.com/EnableSecurity/advisories/tree/master/ES2023-01-asterisk-dtls-hello-raceExploit
- https://github.com/asterisk/asterisk/commit/d7d7764cb07c8a1872804321302ef93bf62cba05Patch
- https://github.com/asterisk/asterisk/security/advisories/GHSA-hxj9-xwr8-w8pqExploit, Vendor Advisory
- https://lists.debian.org/debian-lts-announce/2023/12/msg00019.html
- http://packetstormsecurity.com/files/176251/Asterisk-20.1.0-Denial-Of-Service.htmlExploit, Third Party Advisory, VDB Entry
- http://seclists.org/fulldisclosure/2023/Dec/24Exploit, Mailing List, Third Party Advisory
- http://www.openwall.com/lists/oss-security/2023/12/15/7Exploit, Mailing List
- https://github.com/EnableSecurity/advisories/tree/master/ES2023-01-asterisk-dtls-hello-raceExploit
- https://github.com/asterisk/asterisk/commit/d7d7764cb07c8a1872804321302ef93bf62cba05Patch
- https://github.com/asterisk/asterisk/security/advisories/GHSA-hxj9-xwr8-w8pqExploit, Vendor Advisory
- https://lists.debian.org/debian-lts-announce/2023/12/msg00019.html
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.