#VU66612 Improper Privilege Management in TrouSerS - CVE-2020-24331

Vulnerability identifier: #VU66612

Vulnerability risk: Low

CVSSv4.0: 5.9 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2020-24331

CWE-ID: CWE-269

Exploitation vector: Local

Exploit availability: No

Vulnerable software:
TrouSerS
Client/Desktop applications / Software for system administration

Vendor: TrouSerS

Description

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

The vulnerability exists due to improper privilege management if the tcsd daemon is started with root privileges. A local user can get read and write access to the /etc/tcsd.conf file and escalate privileges on the system.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

TrouSerS: 0.2.8 - 0.3.13

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

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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.