A vulnerability classified as problematic has been found in Samsung DVR (the affected version unknown). Affected is an unknown part of the file /cgi-bin/webviewer_login_page of the component Web Viewer. The manipulation of the argument data3 with the input value </script><script>alert(1)</script> leads to a cross site scripting vulnerability (Reflected). CWE is classifying the issue as CWE-79. The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. This is going to have an impact on integrity. CVE summarizes:

Smart Viewer in Samsung Web Viewer for Samsung DVR is vulnerable to cross-site scripting, caused by improper validation of user-supplied input. A remote attacker could exploit this vulnerability via a crafted URL to execute script in a victim's Web browser within the security context of the hosting Web site, once the URL is clicked. An attacker could use this vulnerability to steal the victim's cookie-based authentication credentials.

The bug was discovered 06/13/2018. The weakness was released 06/14/2018 by Yavuz Atlas as not defined posting (Bugtraq). The advisory is shared for download at securityfocus.com. This vulnerability is traded as CVE-2018-11689 since 06/03/2018. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. Technical details and a public exploit are known. The MITRE ATT&CK project declares the attack technique as T1059.007.

A public exploit has been developed by Yavuz Atlas in URL and been published before and not just after the advisory. The exploit is shared for download at seclists.org. It is declared as proof-of-concept. The vulnerability was handled as a non-public zero-day exploit for at least 1 days. During that time the estimated underground price was around $0-$5k. The code used by the exploit is:

GET /cgi-bin/webviewer_login_page?lang=tu&loginvalue=0&port=0&data3=</script><script>alert(1)</script>

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

Further details are available at seclists.org.

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• Samsung

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• DVR

License

• commercial

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• 🔍

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• 🔍

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