Authorization bypass in Cloud Foundry UAA

1) Authorization bypass

EUVDB-ID: #VU16595

Risk: Low

CVSSv3.1: 5.5 [CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L/E:U/RL:O/RC:C]

CVE-ID: CVE-2018-15754

CWE-ID: CWE-285 - Improper Authorization

Exploit availability: No

Description

The vulnerability allows a remote authenticated attacker to bypass security restrictions on the target system.

The vulnerability exists due to an authorization logic error. In environments with multiple identity providers that contain accounts across identity providers with the same username, a remote authenticated with access to one of these accounts can bypass authorization to obtain a token for an account of the same username in the other identity provider.

Mitigation

Update to version 66.0.

Vulnerable software versions

Cloud Foundry UAA: 60.0 - 64.0

External links

http://www.cloudfoundry.org/blog/cve-2018-15754/

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.

How the attacker can exploit this vulnerability?

The attacker would have to send a specially crafted request to the affected application in order to exploit this vulnerability.

Is there known malware, which exploits this vulnerability?

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