Vulnerability identifier: #VU18335

Vulnerability risk: Medium

CVSSv3.1: 6.6 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L/E:P/RL:O/RC:C]

CVE-ID: CVE-2019-11234

CWE-ID: CWE-287

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
FreeRADIUS
Server applications / Directory software, identity management

Vendor: FreeRADIUS Server Project

Description

The vulnerability allows a remote attacker to bypass authentication process.

The vulnerability exists due to an error related to processing authentication tokens. A remote attacker can execute a reflection attack and bypass authentication process.

This vulnerability was dubbed "Dragonblood".

Mitigation
Install updates from vendor's website.

Vulnerable software versions

FreeRADIUS: 3.0.0 - 3.0.18

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External links
http://bugzilla.redhat.com/show_bug.cgi?id=1695783
http://freeradius.org/release_notes/?br=3.0.x&re=3.0.19
http://freeradius.org/security/
http://papers.mathyvanhoef.com/dragonblood.pdf
http://usn.ubuntu.com/3954-1/
http://www.kb.cert.org/vuls/id/871675/

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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. However, proof of concept for this vulnerability is available.