Vulnerability 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 Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Digium | Asterisk | < 18.20.1 |
| Sangoma | Certified Asterisk | 13.13.0 |
Related Weaknesses (CWE)
References
- http://packetstormsecurity.com/files/176251/Asterisk-20.1.0-Denial-Of-Service.htExploitThird Party AdvisoryVDB Entry
- http://seclists.org/fulldisclosure/2023/Dec/24ExploitMailing ListThird Party Advisory
- http://www.openwall.com/lists/oss-security/2023/12/15/7ExploitMailing List
- https://github.com/EnableSecurity/advisories/tree/master/ES2023-01-asterisk-dtlsExploit
- https://github.com/asterisk/asterisk/commit/d7d7764cb07c8a1872804321302ef93bf62cPatch
- https://github.com/asterisk/asterisk/security/advisories/GHSA-hxj9-xwr8-w8pqExploitVendor Advisory
- https://lists.debian.org/debian-lts-announce/2023/12/msg00019.html
- http://packetstormsecurity.com/files/176251/Asterisk-20.1.0-Denial-Of-Service.htExploitThird Party AdvisoryVDB Entry
- http://seclists.org/fulldisclosure/2023/Dec/24ExploitMailing ListThird Party Advisory
- http://www.openwall.com/lists/oss-security/2023/12/15/7ExploitMailing List
- https://github.com/EnableSecurity/advisories/tree/master/ES2023-01-asterisk-dtlsExploit
- https://github.com/asterisk/asterisk/commit/d7d7764cb07c8a1872804321302ef93bf62cPatch
- https://github.com/asterisk/asterisk/security/advisories/GHSA-hxj9-xwr8-w8pqExploitVendor Advisory
- https://lists.debian.org/debian-lts-announce/2023/12/msg00019.html
FAQ
What is CVE-2023-49786?
CVE-2023-49786 is a vulnerability with a CVSS score of 7.5 (HIGH). 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 susc...
How severe is CVE-2023-49786?
CVE-2023-49786 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2023-49786?
Check the references section above for vendor advisories and patch information. Affected products include: Digium Asterisk, Sangoma Certified Asterisk.