Bug#983157: asterisk: CVE-2021-26717

[Salvatore Bonaccorso]

Source: asterisk
Version: 1:16.15.1~dfsg-1
Severity: important
Tags: security upstream
X-Debbugs-Cc: carnil at debian.org, Debian Security Team <team at security.debian.org>

Hi,

The following vulnerability was published for asterisk.

CVE-2021-26717[0]:
| An issue was discovered in Sangoma Asterisk 16.x before 16.16.1, 17.x
| before 17.9.2, and 18.x before 18.2.1 and Certified Asterisk before
| 16.8-cert6. When re-negotiating for T.38, if the initial remote
| response was delayed just enough, Asterisk would send both audio and
| T.38 in the SDP. If this happened, and the remote responded with a
| declined T.38 stream, then Asterisk would crash.


If you fix the vulnerability please also make sure to include the
CVE (Common Vulnerabilities & Exposures) id in your changelog entry.

For further information see:

[0] https://security-tracker.debian.org/tracker/CVE-2021-26717
    https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-26717
[1] https://downloads.asterisk.org/pub/security/AST-2021-002.html

Regards,
Salvatore