CVE-2023-49786— Asterisk 安全漏洞

Asterisk susceptible to Denial of Service via DTLS Hello packets during call initiation

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/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

对异常条件检查或处理不恰当

Asterisk 安全漏洞

Asterisk是一款PBX系统的软件，运行在Linux系统上，支持使用SIP、IAX、H323协议进行IP通话。 Asterisk 18.20.1 之前、20.5.1 之前 和 21.0.1 之前版本、Certified-asterisk 18.9-cert6 之前版本存在安全漏洞，该漏洞源于在处理用于媒体设置的 DTLS-SRTP 时，由于 DTLS 协议的 hello 握手阶段的竞争条件，Asterisk 容易受到 DoS 的影响。

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