Multiple vulnerabilities in FreeRADIUS

1) Information disclosure

EUVDB-ID: #VU27344

Risk: Medium

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

CVE-ID: CVE-2019-13456

CWE-ID: CWE-200 - Information exposure

Exploit availability: No

Description

The vulnerability allows a remote attacker to gain access to potentially sensitive information.

The vulnerability exists due to the way FreeRadius processes EAP-pwd handshakes. on average 1 in every 2048 EAP-pwd handshakes fails because the password element cannot be found within 10 iterations of the hunting and pecking loop. This leaks information that an attacker can use to recover the password of any user.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

FreeRADIUS: 3.0.0 - 3.0.19

External links

http://bugzilla.redhat.com/show_bug.cgi?id=1737663
http://freeradius.org/security/
http://github.com/FreeRADIUS/freeradius-server/commit/3ea2a5a026e73d81cd9a3e9bbd4300c433004bfa
http://wpa3.mathyvanhoef.com

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.

2) Resource management error

EUVDB-ID: #VU27346

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 - Resource Management Errors

Exploit availability: No

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

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

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.

3) UNIX Hard Link

EUVDB-ID: #VU50016

Risk: Low

CVSSv3.1: 6.1 [CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: N/A

CWE-ID: CWE-62 - UNIX Hard Link

Exploit availability: No

Description

The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists in the way FreeRadius is being started on the system. The systemd service file for freeradius runs "chown -R" on a directory before it starts:

  ExecStartPre=-/bin/chown -R radius.radius /run/radiusd

That can be exploited by the "radius" user to gain root privileges. After the service has been started once, the radius user can place a hard link to a root-owned file in /run/radiusd. If the service is later restarted, then the "chown -R" command will give away ownership of that root-owned file to the "radius" user.

As a result, a local user can execute arbitrary code on the system as root.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

FreeRADIUS: 3.0.0 - 3.0.19

External links

http://security.gentoo.org/glsa/202101-27
http://bugs.gentoo.org/630910
http://gitweb.gentoo.org/repo/gentoo.git/commit/?id=48cd44905411daf0c9914d0df63b387e29e75b10
http://github.com/FreeRADIUS/freeradius-server/commit/26e412b0f775d7219364fec3c204ba6e5877ff1a
http://github.com/FreeRADIUS/freeradius-server/commit/b6f8a6fdd456ebfa889b8867317632bd0ac6b887
http://github.com/FreeRADIUS/freeradius-server/commit/aec8b3e9bbdb67b04fbd3eca8e757e1f114ec613

Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

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.

The attacker would have to login to the system and perform certain actions in order to exploit this vulnerability.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.