Open-Xchange OX Guard up to 2.2.0-rev7 Key Download getprivkeybyid key management

Summaryinfo

A vulnerability was found in Open-Xchange OX Guard up to 2.2.0-rev7 and classified as critical. This vulnerability affects the function getprivkeybyid of the component Key Download. Executing a manipulation can lead to key management. The identification of this vulnerability is CVE-2015-8542. The attack may be launched remotely. There is no exploit available. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability has been found in Open-Xchange OX Guard up to 2.2.0-rev7 and classified as critical. This vulnerability affects the function getprivkeybyid of the component Key Download. The manipulation with an unknown input leads to a key management vulnerability. The CWE definition for the vulnerability is CWE-320. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

An issue was discovered in Open-Xchange Guard before 2.2.0-rev8. The "getprivkeybyid" API call is used to download a PGP Private Key for a specific user after providing authentication credentials. Clients provide the "id" and "cid" parameter to specify the current user by its user- and context-ID. The "auth" parameter contains a hashed password string which gets created by the client by asking the user to enter his or her OX Guard password. This parameter is used as single point of authentication when accessing PGP Private Keys. In case a user has set the same password as another user, it is possible to download another user's PGP Private Key by iterating the "id" and "cid" parameters. This kind of attack would also be able by brute-forcing login credentials, but since the "id" and "cid" parameters are sequential they are much easier to predict than a user's login name. At the same time, there are some obvious insecure standard passwords that are widely used. A attacker could send the hashed representation of typically weak passwords and randomly fetch Private Key of matching accounts. The attack can be executed by both internal users and "guests" which use the external mail reader.

The bug was discovered 03/03/2016. The weakness was shared 12/15/2016 (Website). The advisory is shared for download at packetstormsecurity.com. This vulnerability was named CVE-2015-8542 since 12/11/2015. The attack can be initiated remotely. A single authentication is needed for exploitation. There are known technical details, but no exploit is available. The MITRE ATT&CK project declares the attack technique as T1600.001.

The vulnerability was handled as a non-public zero-day exploit for at least 287 days. During that time the estimated underground price was around $0-$5k.

Upgrading to version 2.2.0-rev8 eliminates this vulnerability.

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Productinfo

Vendor

• Open-Xchange

Name

• OX Guard

Version

• 2.2.0-rev7

License

• open-source

Website

• Vendor: https://www.open-xchange.com/

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CPE 2.2info

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