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.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
33cpe:2.3:a:sangoma:certified_asterisk:13.13.0:*:*:*:*:*:*:*+ 27 more
- cpe:2.3:a:sangoma:certified_asterisk:13.13.0:*:*:*:*:*:*:*
- cpe:2.3:a:sangoma:certified_asterisk:13.13.0:cert1-rc1:*:*:*:*:*:*
- cpe:2.3:a:sangoma:certified_asterisk:13.13.0:cert1-rc2:*:*:*:*:*:*
- cpe:2.3:a:sangoma:certified_asterisk:13.13.0:cert1-rc3:*:*:*:*:*:*
- cpe:2.3:a:sangoma:certified_asterisk:13.13.0:cert1-rc4:*:*:*:*:*:*
- cpe:2.3:a:sangoma:certified_asterisk:13.13.0:cert1:*:*:*:*:*:*
- cpe:2.3:a:sangoma:certified_asterisk:13.13.0:cert2:*:*:*:*:*:*
- cpe:2.3:a:sangoma:certified_asterisk:13.13.0:cert3:*:*:*:*:*:*
- cpe:2.3:a:sangoma:certified_asterisk:13.13.0:rc1:*:*:*:*:*:*
- cpe:2.3:a:sangoma:certified_asterisk:13.13.0:rc2:*:*:*:*:*:*
- cpe:2.3:a:sangoma:certified_asterisk:16.8.0:-:*:*:*:*:*:*
- cpe:2.3:a:sangoma:certified_asterisk:16.8.0:cert10:*:*:*:*:*:*
- cpe:2.3:a:sangoma:certified_asterisk:16.8.0:cert11:*:*:*:*:*:*
- cpe:2.3:a:sangoma:certified_asterisk:16.8.0:cert12:*:*:*:*:*:*
- cpe:2.3:a:sangoma:certified_asterisk:16.8.0:cert1:*:*:*:*:*:*
- cpe:2.3:a:sangoma:certified_asterisk:16.8.0:cert2:*:*:*:*:*:*
- cpe:2.3:a:sangoma:certified_asterisk:16.8.0:cert3:*:*:*:*:*:*
- cpe:2.3:a:sangoma:certified_asterisk:16.8.0:cert4:*:*:*:*:*:*
- cpe:2.3:a:sangoma:certified_asterisk:16.8.0:cert5:*:*:*:*:*:*
- cpe:2.3:a:sangoma:certified_asterisk:16.8.0:cert6:*:*:*:*:*:*
- cpe:2.3:a:sangoma:certified_asterisk:16.8.0:cert7:*:*:*:*:*:*
- cpe:2.3:a:sangoma:certified_asterisk:16.8.0:cert8:*:*:*:*:*:*
- cpe:2.3:a:sangoma:certified_asterisk:16.8.0:cert9:*:*:*:*:*:*
- cpe:2.3:a:sangoma:certified_asterisk:18.9:cert1:*:*:*:*:*:*
- cpe:2.3:a:sangoma:certified_asterisk:18.9:cert2:*:*:*:*:*:*
- cpe:2.3:a:sangoma:certified_asterisk:18.9:cert3:*:*:*:*:*:*
- cpe:2.3:a:sangoma:certified_asterisk:18.9:cert4:*:*:*:*:*:*
- cpe:2.3:a:sangoma:certified_asterisk:18.9:cert5:*:*:*:*:*:*
- Range: <18.9-cert6
Patches
Vulnerability mechanics
References
7- github.com/asterisk/asterisk/commit/d7d7764cb07c8a1872804321302ef93bf62cba05nvdPatch
- packetstormsecurity.com/files/176251/Asterisk-20.1.0-Denial-Of-Service.htmlnvdExploitThird Party AdvisoryVDB Entry
- seclists.org/fulldisclosure/2023/Dec/24nvdExploitMailing ListThird Party Advisory
- www.openwall.com/lists/oss-security/2023/12/15/7nvdExploitMailing List
- github.com/EnableSecurity/advisories/tree/master/ES2023-01-asterisk-dtls-hello-racenvdExploit
- github.com/asterisk/asterisk/security/advisories/GHSA-hxj9-xwr8-w8pqnvdExploitVendor Advisory
- lists.debian.org/debian-lts-announce/2023/12/msg00019.htmlnvd
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