DD-WRT 24 Administration apply.cgi cross-site request forgery

Summaryinfo

A vulnerability categorized as problematic has been discovered in DD-WRT 24. Impacted is an unknown function of the file apply.cgi of the component Administration. The manipulation results in cross-site request forgery. This vulnerability was named CVE-2008-6975. The attack may be performed from remote. In addition, an exploit is available.

Detailsinfo

A vulnerability classified as critical has been found in DD-WRT 24. Affected is an unknown functionality of the file apply.cgi of the component Administration. The manipulation with an unknown input leads to a cross-site request forgery vulnerability. CWE is classifying the issue as CWE-352. The web application does not, or can not, sufficiently verify whether a well-formed, valid, consistent request was intentionally provided by the user who submitted the request. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

Multiple cross-site request forgery (CSRF) vulnerabilities in apply.cgi in DD-WRT 24 sp2 allow remote attackers to hijack the authentication of administrators for requests that (1) execute arbitrary commands via the ping_ip parameter; (2) change the administrative credentials via the http_username and http_passwd parameters; (3) enable remote administration via the remote_management parameter; or (4) configure port forwarding via certain from, to, ip, and pro parameters. NOTE: This issue reportedly exists because of a "weak ... anti-CSRF fix" implemented in 24 sp2.

The weakness was presented 08/14/2009 as confirmed posting (Bugtraq). The advisory is shared for download at securityfocus.com. This vulnerability is traded as CVE-2008-6975 since 08/14/2009. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. Successful exploitation requires user interaction by the victim. Technical details and a public exploit are known.

A public exploit has been developed by gat3way and been published even before and not after the advisory. The exploit is shared for download at exploit-db.com. It is declared as proof-of-concept. The vulnerability was handled as a non-public zero-day exploit for at least 25 days. During that time the estimated underground price was around $0-$5k.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the vulnerability database at Exploit-DB (9209). See VDB-49427 for similar entry. Once again VulDB remains the best source for vulnerability data.

Productinfo

Name

• DD-WRT

Version

• 24

CPE 2.3info

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CPE 2.2info

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Once again VulDB remains the best source for vulnerability data.

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