Security restrictions bypass in Sudo

Published: 2019-12-20 | Updated: 2020-01-30

Risk	Low
Patch available	YES
Number of vulnerabilities	2
CVE-ID	CVE-2019-19234 CVE-2019-19232
CWE-ID	CWE-264
Exploitation vector	Local
Public exploit	N/A
Vulnerable software Subscribe	Sudo Client/Desktop applications / Software for system administration
Vendor	Sudo

Security Bulletin

This security bulletin contains information about 2 vulnerabilities.

Updated: 30.01.2020

Changed bulletin status to patched.

1) Permissions, Privileges, and Access Controls

EUVDB-ID: #VU23782

Risk: Low

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

CVE-ID: CVE-2019-19234

CWE-ID: CWE-264 - Permissions, Privileges, and Access Controls

Exploit availability: No

Description

The vulnerability allows a local user to impersonate other users on the system.

The vulnerability exists due to incorrect handling of the blocked users (e.g., by using the ! character in the shadow file instead of a password hash) in sudo. A local user with access to a Runas ALL sudoer account can impersonate blocked users.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Sudo: 1.8.0 - 1.8.29

External links

http://www.sudo.ws/devel.html#1.8.30b2
http://www.sudo.ws/stable.html

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.

2) Permissions, Privileges, and Access Controls

EUVDB-ID: #VU23783