Insufficient entropy in Red Hat OpenShift Service Mesh 2.1

1) Insufficient Entropy

EUVDB-ID: #VU71686

Risk: Low

CVSSv4.0: 1.7 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2021-4238

CWE-ID: CWE-331 - Insufficient Entropy

Exploit availability: No

Description

The vulnerability allows a remote attacker to gain access to sensitive information.

The vulnerability exists due to insufficient entropy when generating alphanumeric strings within RandomAlphaNumeric and CryptoRandomAlphaNumeric functions, which always return strings containing at least one digit from 0 to 9. A remote attacker can launch brute-force attacks and gain access to sensitive information.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

OpenShift Service Mesh: 2.1.0 - 2.1.5.1

servicemesh-ratelimit (Red Hat package): before 2.1.6-1.el8

servicemesh-proxy (Red Hat package): before 2.1.6-1.el8

servicemesh-prometheus (Red Hat package): before 2.23.0-10.el8

servicemesh-operator (Red Hat package): before 2.1.6-1.el8

servicemesh (Red Hat package): before 2.1.6-1.el8

CPE2.3

• cpe:2.3:a:red_hat:openshift_service_mesh:2.1.5.1:*:*:*:*:*:*:*
• cpe:2.3:o:red_hat:servicemesh-ratelimit_redhat_package:*:*:*:*:*:red_hat_enterprise_linux:*:*
• cpe:2.3:o:red_hat:servicemesh-proxy_redhat_package:*:*:*:*:*:red_hat_enterprise_linux:*:*
• cpe:2.3:o:red_hat:servicemesh-prometheus_redhat_package:*:*:*:*:*:red_hat_enterprise_linux:*:*
• cpe:2.3:o:red_hat:servicemesh-operator_redhat_package:*:*:*:*:*:red_hat_enterprise_linux:*:*
• cpe:2.3:o:red_hat:servicemesh_redhat_package:*:*:*:*:*:red_hat_enterprise_linux:*:*

External links

https://access.redhat.com/errata/RHSA-2023:0540

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.