#VU54393 Improper Authorization in OVN Kubernetes - CVE-2021-3499

Vulnerability identifier: #VU54393

Vulnerability risk: Medium

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

CVE-ID: CVE-2021-3499

CWE-ID: CWE-285

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
OVN Kubernetes
Server applications / Other server solutions

Vendor: Open Virtual Network

Description

The vulnerability allows a remote attacker to gain access to restricted resources.

The vulnerability exists in OVN Kubernetes where the Egress Firewall does not reliably apply firewall rules when there is multiple DNS rules. A remote attacker can gain unauthorized access to the protected system.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

OVN Kubernetes: 0.1.0 - 0.3.0

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External links
https://bugzilla.redhat.com/show_bug.cgi?id=1949188

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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.