Privilege escalation in TrouSerS

1) Improper Privilege Management

EUVDB-ID: #VU66471

Risk: Low

CVSSv3.1: 6.8 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2020-24330

CWE-ID: CWE-269 - Improper Privilege Management

Exploit availability: No

Description

The vulnerability allows a local user to escalate privileges.

The vulnerability exists due to the tcsd daemon is started with root privileges instead of tss user and fails to drop them after successful start. A local user can abuse such behavior and escalate privileges on the system.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

TrouSerS: 0.2.8 - 0.3.14

External links

http://bugzilla.suse.com/show_bug.cgi?id=1164472
http://sourceforge.net/p/trousers/mailman/message/37015817/
http://seclists.org/oss-sec/2020/q2/att-135/tcsd_fixes.patch
http://www.openwall.com/lists/oss-security/2020/08/14/1
http://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/SSDL7COIFCZQMUBNAASNMKMX7W5JUHRD/

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.

Is there known malware, which exploits this vulnerability?

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