#VU58173 Resource exhaustion in Cloud Controller - CVE-2021-22101

Vulnerability identifier: #VU58173

Vulnerability risk: Medium

CVSSv4.0: 6.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2021-22101

CWE-ID: CWE-400

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Cloud Controller
Web applications / Modules and components for CMS

Vendor: Cloud Foundry Foundation

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to application does not properly control consumption of internal resources. A remote attacker can trigger resource exhaustion by using REST HTTP requests with label_selectors on multiple V3 endpoints by generating an enormous SQL query.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Cloud Controller: 1.0.0 - 1.117.0

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External links
https://www.cloudfoundry.org/blog/cve-2021-22101-cloud-controller-is-vulnerable-to-unauthenticated-denial-of-service/

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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.