mailing list archives
Cisco/Linksys HTTP Service Remote DoS (Denial of Service)
From: Carl Benedict <theinfinitenigma () gmail com>
Date: Tue, 23 Apr 2013 21:44:24 -0700
Software : Cisco/Linksys Router OS
Hardware : WRT310N v2 (others currently untested)
Version : 2.0.00 (others currently untested)
Website : http://www.linksys.com
Issue : Remote Denial of Service
Severity : High
Researcher: Carl Benedict (theinfinitenigma)
The Cisco/Linksys WRT310N v2 is a consumer-grade router, wireless access point, and gigabit switch.
The HTTP service on this device is vulnerable to a remote denial of service condition via multiple parameters in the
'setup' form of index.asp.
These inputs expect fixed-length data in the format of an IP address octet (numbers 0 - 255). While client-side
protections are in place, no input validation on the server side is performed. One can leverage other vulnerabilities
reported in this platform (XSS and CSRF) to exacerbate this issue. The page 'apply.cgi' allows HTML forms to be
submitted via both HTTP POST and HTTP GET requests. The following crafted link can be used to pass a value greater
than 18 bytes in one of the above-mentioned paramaters causing the HTTP service to stop responding.
The service will stop responding and become inaccessible for several minutes. After a few minutes, it appears that an
automated task such as a CRON job restarts the service.
Authentication is required to perform this action. The application uses HTTP Basic Authentication, which is weak
(base64-encoded credentials in the format of username:password).
04/16/2013 : Discovery
04/23/2013 : Advisory released
Cisco/Linksys WRT310N v2 XSS: http://cve.mitre.org/cgi-bin/cvename.cgi?name=2013-3067
Cisco/Linksys WRT310N v2 CSRF: http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2013-3068
- Cisco/Linksys HTTP Service Remote DoS (Denial of Service) Carl Benedict (Apr 24)