D-Link DCS-936L up to 1.05 CSRF Protection Referer Header cross-site request forgery

Summaryinfo

A vulnerability was found in D-Link DCS-936L up to 1.05. It has been classified as problematic. This issue affects some unknown processing of the component CSRF protection. Performing a manipulation as part of Referer Header results in cross-site request forgery. This vulnerability was named CVE-2017-7851. The attack may be initiated remotely. In addition, an exploit is available. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability, which was classified as problematic, was found in D-Link DCS-936L up to 1.05. This affects an unknown code block of the component CSRF Protection. The manipulation as part of a Referer Header 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 integrity. The summary by CVE is:

D-Link DCS-936L devices with firmware before 1.05.07 have an inadequate CSRF protection mechanism that requires the device's IP address to be a substring of the HTTP Referer header.

The bug was discovered 03/26/2017. The weakness was presented 11/15/2017 (Website). It is possible to read the advisory at ftp2.dlink.com. This vulnerability is uniquely identified as CVE-2017-7851 since 04/13/2017. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. It demands that the victim is doing some kind of user interaction. Technical details are unknown but a public exploit is available.

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 234 days. During that time the estimated underground price was around $5k-$25k. The commercial vulnerability scanner Qualys is able to test this issue with plugin 87291 (D-Link Network Camera DCS-936L Weak CSRF Protection Vulnerability).

Upgrading to version 1.05.07 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at Exploit-DB (43146). Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Vendor

• D-Link

Name

• DCS-936L

Version

• 1.05

License

• commercial

Website

• Vendor: https://www.dlink.com/

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Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

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