Bug#891227: asterisk: CVE-2018-7284: AST-2018-004: Crash when receiving SUBSCRIBE request

[Salvatore Bonaccorso]

Source: asterisk
Version: 1:13.18.5~dfsg-1
Severity: grave
Tags: patch security upstream

Hi,

the following vulnerability was published for asterisk.

CVE-2018-7284[0]:
| A Buffer Overflow issue was discovered in Asterisk through 13.19.1,
| 14.x through 14.7.5, and 15.x through 15.2.1, and Certified Asterisk
| through 13.18-cert2. When processing a SUBSCRIBE request, the
| res_pjsip_pubsub module stores the accepted formats present in the
| Accept headers of the request. This code did not limit the number of
| headers it processed, despite having a fixed limit of 32. If more than
| 32 Accept headers were present, the code would write outside of its
| memory and cause a 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-2018-7284
    https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-7284
[1] http://downloads.asterisk.org/pub/security/AST-2018-004.html

Please adjust the affected versions in the BTS as needed.

Regards,
Salvatore