A vulnerability classified as critical has been found in Microstrategy Web 7. Affected is an unknown code of the file /WebMstr7/servlet/mstrWeb. The manipulation of the argument subpage with the input value ../.. leads to a path traversal vulnerability. CWE is classifying the issue as CWE-22. The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory. This is going to have an impact on confidentiality. CVE summarizes:

Directory traversal vulnerability in Microstrategy Web, version 7, in "/WebMstr7/servlet/mstrWeb" (in the parameter subpage) allows remote authenticated users to bypass intended SecurityManager restrictions and list a parent directory via a /.. (slash dot dot) in a pathname used by a web application. NOTE: this is a deprecated product.

The bug was discovered 10/30/2018. The weakness was released 10/31/2018 (Website). The advisory is shared for download at packetstormsecurity.com. This vulnerability is traded as CVE-2018-18777 since 10/28/2018. The exploitability is told to be easy. It is possible to launch the attack remotely. A authentication is needed for exploitation. Technical details and a public exploit are known. The MITRE ATT&CK project declares the attack technique as T1006.

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 2 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 (45755). Entries connected to this vulnerability are available at VDB-126394 and VDB-126395. VulDB is the best source for vulnerability data and more expert information about this specific topic.

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• Microstrategy

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• Web

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• 7

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