Denial of service in IBM Cloud Automation Manager

1) Improper Certificate Validation

EUVDB-ID: #VU55665

Risk: Medium

CVSSv4.0: 7.7 [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:P/U:Green]

CVE-ID: CVE-2021-34558

CWE-ID: CWE-295 - Improper Certificate Validation

Exploit availability: Yes

Description

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

The vulnerability exists due to improper certificate verification in crypto/tls package in Go when processing X.509 certificates. The application does not properly assert that the type of public key in an X.509 certificate matches the expected type when doing a RSA based key exchange, allowing a malicious TLS server to cause a TLS client to panic.

Mitigation

Install update from vendor's website.

Vulnerable software versions

IBM Cloud Automation Manager: 4.2.0.1

CPE2.3

• cpe:2.3:a:ibm_corporation:ibm_cloud_automation_manager:4.2.0.1:*:*:*:*:*:*:*

External links

https://www.ibm.com/blogs/psirt/security-bulletin-a-security-vulnerability-in-golang-go-affects-ibm-cloud-automation-manager/
https://www.ibm.com/support/pages/node/6489851

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. However, proof of concept for this vulnerability is available.