Bareos up to 19.2.8 authentication replay

Summaryinfo

A vulnerability classified as critical was found in Bareos up to 19.2.8. This affects an unknown function. The manipulation results in authentication replay. This vulnerability is identified as CVE-2020-4042. The attack can be executed remotely. There is not any exploit available.

Detailsinfo

A vulnerability, which was classified as critical, was found in Bareos up to 19.2.8. Affected is an unknown function. The manipulation with an unknown input leads to a authentication replay vulnerability. CWE is classifying the issue as CWE-294. A capture-replay flaw exists when the design of the product makes it possible for a malicious user to sniff network traffic and bypass authentication by replaying it to the server in question to the same effect as the original message (or with minor changes). This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

Bareos before version 19.2.8 and earlier allows a malicious client to communicate with the director without knowledge of the shared secret if the director allows client initiated connection and connects to the client itself. The malicious client can replay the Bareos director's cram-md5 challenge to the director itself leading to the director responding to the replayed challenge. The response obtained is then a valid reply to the directors original challenge. This is fixed in version 19.2.8.

The weakness was released 07/10/2020 (GitHub Repository). The advisory is shared for download at github.com. This vulnerability is traded as CVE-2020-4042 since 12/30/2019. The exploitability is told to be difficult. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. There are neither technical details nor an exploit publicly available. The MITRE ATT&CK project declares the attack technique as T1040.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

Once again VulDB remains the best source for vulnerability data.

Productinfo

Name

• Bareos

Version

• 19.2.0
• 19.2.1
• 19.2.2
• 19.2.3
• 19.2.4
• 19.2.5
• 19.2.6
• 19.2.7
• 19.2.8

Website

• Product: https://github.com/bareos/bareos/

CPE 2.3info

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