#VU59994 State Issues in strongSwan - CVE-2021-45079

Vulnerability identifier: #VU59994

Vulnerability risk: High

CVSSv4.0: 6.8 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber]

CVE-ID: CVE-2021-45079

CWE-ID: CWE-371

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
strongSwan
Server applications / Encryption software

Vendor: strongswan.org

Description

The vulnerability allows a remote attacker to bypass authentication.

The vulnerability exists due to improper handling of EAP-Success messages. A remote attacker can send a specially crafted (early) EAP-Success message to the affected system and bypass authentication or perform a denial of service attack.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

strongSwan: 4.1.2 - 5.9.4

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External links
https://www.strongswan.org/blog/2022/01/24/strongswan-vulnerability-(cve-2021-45079).html

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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.