Vulnerability identifier: #VU27346

Vulnerability risk: Medium

CVSSv3.1: 6.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2019-17185

CWE-ID: CWE-399

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 perform a denial of service (DoS) attack.

The vulnerability exists due to the EAP-pwd module uses a global OpenSSL BN_CTX instance to handle all handshakes. This mean multiple threads use the same BN_CTX instance concurrently, resulting in crashes when concurrent EAP-pwd handshakes are initiated. A remote attacker can perform multiple login attempts and crash the daemon.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

FreeRADIUS: 3.0.0 - 3.0.19

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External links
http://lists.opensuse.org/opensuse-security-announce/2020-04/msg00039.html
http://freeradius.org/security/
http://github.com/FreeRADIUS/freeradius-server/releases/tag/release_3_0_20

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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.