Vulnerability identifier: #VU25575

Vulnerability risk: Low

CVSSv3.1: 5.3 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2020-5402

CWE-ID: CWE-352

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
CF Deployment
Server applications / Frameworks for developing and running applications
Cloud Foundry UAA
Server applications / Web servers

Vendor: Cloud Foundry Foundation

Description

The vulnerability allows a remote attacker to perform cross-site request forgery attacks.

The vulnerability exists due to the OAuth2 state parameter not being checked in the "callback" function when authenticating with external identity providers. A remote attacker can trick the victim to visit a specially crafted web page and perform arbitrary actions on behalf of the victim on the vulnerable website.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

CF Deployment: 12.0.0 - 12.32.0

Cloud Foundry UAA: 74.0.0 - 74.13.0

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External links
http://www.cloudfoundry.org/blog/cve-2020-5402/

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.