A vulnerability, which was classified as problematic, has been found in Exponent CMS up to 2.3.6 (Content Management System). This issue affects some unknown processing of the component Upload. The manipulation with an unknown input leads to a cross site scripting vulnerability. Using CWE to declare the problem leads to CWE-79. The software 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. Impacted is integrity. The summary by CVE is:

Exponent CMS before 2.3.7 does not properly restrict the types of files that can be uploaded, which allows remote attackers to conduct cross-site scripting (XSS) attacks and possibly have other unspecified impact as demonstrated by uploading a file with an .html extension, then accessing it via the elFinder functionality.

The bug was discovered 04/21/2016. The weakness was published 01/18/2017 (Website). The advisory is shared at exponentcms.lighthouseapp.com. The identification of this vulnerability is CVE-2015-8684 since 12/26/2015. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. It demands that the victim is doing some kind of user interaction. Neither technical details nor an exploit are publicly available. MITRE ATT&CK project uses the attack technique T1059.007 for this issue.

The vulnerability was handled as a non-public zero-day exploit for at least 272 days. During that time the estimated underground price was around $0-$5k.

Upgrading to version 2.3.7 eliminates this vulnerability.

Similar entry is available at 95464.

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• Content Management System

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• Exponent

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• CMS

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• open-source

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