Denial of service in Red Hat OpenShift Service on AWS (ROSA)



Published: 2022-01-24
Risk Medium
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2021-34558
CWE-ID CWE-295
Exploitation vector Network
Public exploit Public exploit code for vulnerability #1 is available.
Vulnerable software
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rosa (Red Hat package)
Operating systems & Components / Operating system package or component

Vendor Red Hat Inc.

Security Bulletin

This security bulletin contains one medium risk vulnerability.

1) Improper Certificate Validation

EUVDB-ID: #VU55665

Risk: Medium

CVSSv3.1: 6.7 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:P/RL:O/RC:C]

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 updates from vendor's website.

Vulnerable software versions

rosa (Red Hat package): before 1.1.1-51c4a5e.el8

External links

http://access.redhat.com/errata/RHEA-2021:3287


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.



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