Denial of service in Cloud Foundry Routing (Gorouter) and CF Deployment

1) Input validation error

EUVDB-ID: #VU46658

Risk: Medium

CVSSv4.0: 4.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2020-5420

CWE-ID: CWE-20 - Improper input validation

Exploit availability: No

Description

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

The vulnerability exists due to insufficient validation of user-supplied input. A remote authenticated attacker with "cf push" access can push an app that returns specially crafted HTTP responses and perform a denial of service (DoS) attack.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Routing Release: 0.62.0 - 0.205.0

CF Deployment: 0.0.0 - 13.14.0

CPE2.3

• cpe:2.3:a:cloud_foundry_foundation:routing_release:0.62.0:*:*:*:*:*:*:*
• cpe:2.3:a:cloud_foundry_foundation:routing_release:0.66.0:*:*:*:*:*:*:*
• cpe:2.3:a:cloud_foundry_foundation:routing_release:0.69.0:*:*:*:*:*:*:*
• cpe:2.3:a:cloud_foundry_foundation:cf_deployment:0.0.0:*:*:*:*:*:*:*
• cpe:2.3:a:cloud_foundry_foundation:cf_deployment:0.0.1:*:*:*:*:*:*:*
• cpe:2.3:a:cloud_foundry_foundation:cf_deployment:0.0.2:*:*:*:*:*:*:*

External links

https://www.cloudfoundry.org/blog/cve-2020-5420

Q & A

Can this vulnerability be exploited remotely?

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

Is there known malware, which exploits this vulnerability?

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