chan_sip in Asterisk Open Source 1.8.x, 11.x before 11.21.1, 12.x, and 13.x before 13.7.1 and Certified Asterisk 1.8.28, 11.6 before 11.6-cert12, and 13.1 before 13.1-cert3, when the timert1 sip.conf configuration is set to a value greater than 1245, allows remote attackers to cause a denial of service (file descriptor consumption) via vectors related to large retransmit timeout values.
Weakness
The product subtracts one value from another, such that the result is less than the minimum allowable integer value, which produces a value that is not equal to the correct result.
Affected Software
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Fedora | Fedoraproject | 22 (including) | 22 (including) |
| Fedora | Fedoraproject | 23 (including) | 23 (including) |
| Asterisk | Ubuntu | artful | * |
| Asterisk | Ubuntu | esm-apps/xenial | * |
| Asterisk | Ubuntu | precise | * |
| Asterisk | Ubuntu | trusty | * |
| Asterisk | Ubuntu | upstream | * |
| Asterisk | Ubuntu | wily | * |
| Asterisk | Ubuntu | xenial | * |
| Asterisk | Ubuntu | yakkety | * |
| Asterisk | Ubuntu | zesty | * |
References
- http://downloads.asterisk.org/pub/security/AST-2016-002.html
- http://lists.fedoraproject.org/pipermail/package-announce/2016-February/177409.html
- http://lists.fedoraproject.org/pipermail/package-announce/2016-February/177422.html
- http://www.debian.org/security/2016/dsa-3700
- http://www.securityfocus.com/bid/82651
- http://www.securitytracker.com/id/1034930
- http://downloads.asterisk.org/pub/security/AST-2016-002.html
- http://lists.fedoraproject.org/pipermail/package-announce/2016-February/177409.html
- http://lists.fedoraproject.org/pipermail/package-announce/2016-February/177422.html
- http://www.debian.org/security/2016/dsa-3700
- http://www.securityfocus.com/bid/82651
- http://www.securitytracker.com/id/1034930