Bug#974713: asterisk: CVE-2020-28242

[Salvatore Bonaccorso]

Source: asterisk
Version: 1:16.12.0~dfsg-1
Severity: important
Tags: security upstream
Forwarded: https://issues.asterisk.org/jira/browse/ASTERISK-29013
X-Debbugs-Cc: carnil at debian.org, Debian Security Team <team at security.debian.org>

Hi,

The following vulnerability was published for asterisk.

CVE-2020-28242[0]:
| An issue was discovered in Asterisk Open Source 13.x before 13.37.1,
| 16.x before 16.14.1, 17.x before 17.8.1, and 18.x before 18.0.1 and
| Certified Asterisk before 16.8-cert5. If Asterisk is challenged on an
| outbound INVITE and the nonce is changed in each response, Asterisk
| will continually send INVITEs in a loop. This causes Asterisk to
| consume more and more memory since the transaction will never
| terminate (even if the call is hung up), ultimately leading to a
| restart or shutdown of Asterisk. Outbound authentication must be
| configured on the endpoint for this to occur.


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-2020-28242
    https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-28242
[1] https://issues.asterisk.org/jira/browse/ASTERISK-29013
[2] https://downloads.asterisk.org/pub/security/AST-2020-002.html

Please adjust the affected versions in the BTS as needed.

Regards,
Salvatore