Authentication bypass in FreeRADIUS

Published: 2019-04-25

Risk	Medium
Patch available	YES
Number of vulnerabilities	2
CVE-ID	CVE-2019-11234 CVE-2019-11235
CWE-ID	CWE-287
Exploitation vector	Network
Public exploit	Public exploit code for vulnerability #1 is available. Public exploit code for vulnerability #2 is available.
Vulnerable software Subscribe	FreeRADIUS Server applications / Directory software, identity management
Vendor	FreeRADIUS Server Project

Security Bulletin

This security bulletin contains information about 2 vulnerabilities.

1) Improper Authentication

EUVDB-ID: #VU18335

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 - Improper Authentication

Exploit availability: No

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

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/

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

How the attacker can exploit this vulnerability?

The attacker would have to send a specially crafted request to the affected application in order to exploit this vulnerability.

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.

2) Improper Authentication

EUVDB-ID: #VU18336