A vulnerability has been found in DotClear 2.9.1 (Blog Software) and classified as critical. Affected by this vulnerability is an unknown functionality of the file /dotclear/admin/media.php of the component ZIP Download Handler. The manipulation of the argument d with an unknown input leads to a privileges management vulnerability (Directory). The CWE definition for the vulnerability is CWE-269. The product does not properly assign, modify, track, or check privileges for an actor, creating an unintended sphere of control for that actor. As an impact it is known to affect confidentiality, integrity, and availability.

The weakness was released 08/24/2016 by Wiswat Aswamenakul as confirmed mailinglist post (Full-Disclosure). It is possible to read the advisory at seclists.org. The public release was coordinated with the project team. The exploitation appears to be easy. The attack can be launched remotely. The successful exploitation needs a single authentication. Technical details and also a public exploit are known. The attack technique deployed by this issue is T1068 according to MITRE ATT&CK. The advisory points out:

Authenticated users with media manager access permission are allowed to download media directories in zip file format. The directory path to be zipped is not properly verified. As a result, it is possible for authenticated users with media manager access permission to download all directories readable by web server and located in the same traversal path as dotclear in zipped format. For example, if dotclear is located at /var/www/html/dotclear/ following directories can be downloaded if web server has read permission.

A public exploit has been developed in URL and been published immediately after the advisory. It is possible to download the exploit at seclists.org. It is declared as proof-of-concept. The vulnerability was handled as a non-public zero-day exploit for at least 4 days. During that time the estimated underground price was around $0-$5k. By approaching the search of inurl:dotclear/admin/media.php it is possible to find vulnerable targets with Google Hacking. The code used by the exploit is:

http://example.com/dotclear/admin/media.php?popup=0&select=0&d=./../&zipdl=1

Upgrading to version 2.10 eliminates this vulnerability. A possible mitigation has been published even before and not after the disclosure of the vulnerability.

Entries connected to this vulnerability are available at 90933 and 90932.

Productinfo

Type

• Blog Software

Name

• DotClear

Version

• 2.9.1

License

• open-source

CPE 2.3info

• 🔍

CPE 2.2info

• 🔍

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