#VU27346 Resource management error in FreeRADIUS - CVE-2019-17185

Vulnerability identifier: #VU27346

Vulnerability risk: Medium

CVSSv4.0: 6.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

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.beta0 - 3.0.19

---

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

---

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.