Vulnerability identifier: #VU18336

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-2019-11235

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 FreeRadius mishandles secure checks when preforming user authentication process. The related checks refer to mechanisms, which ensures that "each participant verifies that the received scalar is within a range, and that the received group element is a valid point on the curve being used". A remote attacker can bypass authentication process.

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=1695748
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.