Race condition in OpenShift Serverless Client

1) Race condition

EUVDB-ID: #VU55668

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-2021-36221

CWE-ID: CWE-362 - Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

Exploit availability: No

Description

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

The vulnerability exists due to a race condition in net/http/httputil ReverseProxy when handling ErrAbortHandler events. A remote attacker can trigger a race condition and crash the ReverseProxy.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Red Hat OpenShift Serverless: 1.0.0 - 1.18.0

openshift-serverless-clients (Red Hat package): 0.2.3-1.el8 - 0.22.0-3.el8

CPE2.3

• cpe:2.3:a:red_hat:red_hat_openshift_serverless:1.0.0:*:*:*:*:*:*:*
• cpe:2.3:a:red_hat:red_hat_openshift_serverless:1.1.0:*:*:*:*:*:*:*
• cpe:2.3:a:red_hat:red_hat_openshift_serverless:1.2.0:*:*:*:*:*:*:*
• cpe:2.3:a:red_hat:openshift-serverless-clients_redhat_package:0.2.3-1.el8:*:*:*:*:red_hat_enterprise_linux:*:*
• cpe:2.3:a:red_hat:openshift-serverless-clients_redhat_package:0.9.0-1.el8:*:*:*:*:red_hat_enterprise_linux:*:*
• cpe:2.3:a:red_hat:openshift-serverless-clients_redhat_package:0.10.0-1.el8:*:*:*:*:red_hat_enterprise_linux:*:*

External links

https://access.redhat.com/errata/RHSA-2021:4765

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.