A vulnerability has been found in Horde Groupware 5.2.21 (Groupware Software) and classified as critical. This vulnerability affects some unknown processing of the component gollem. The manipulation of the argument fn as part of a Parameter leads to a access control vulnerability. The CWE definition for the vulnerability is CWE-264. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

The File Manager (gollem) module 3.0.11 in Horde Groupware 5.2.21 allows remote attackers to bypass Horde authentication for file downloads via a crafted fn parameter that corresponds to the exact filename.

The bug was discovered 10/03/2017. The weakness was published 10/11/2017 (Website). The advisory is shared for download at blogs.securiteam.com. This vulnerability was named CVE-2017-15235 since 10/10/2017. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. Technical details and also a public exploit are known. The MITRE ATT&CK project declares the attack technique as T1068.

It is possible to download the exploit 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 7 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 (44059).

Productinfo

Type

• Groupware Software

Name

• Horde Groupware

Version

• 5.2.21

License

• free

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CPE 2.2info

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