Information disclosure in Sudo

1) Out-of-bounds write

EUVDB-ID: #VU68973

Risk: Low

CVSSv3.1: 3.9 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:L/E:U/RL:O/RC:C]

CVE-ID: CVE-2022-43995

CWE-ID: CWE-787 - Out-of-bounds write

Exploit availability: No

Description

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

The vulnerability exists due to a boundary condition within plugins/sudoers/auth/passwd.c when Sudo is configured to use the crypt() password backend (e.g. when passwd authentication is enabled). A local user with access to Sudo  can enter a password of 8 characters or fewer to trigger a heap-based buffer over-read and gain access to sensitive information.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Sudo: 1.8.0 - 1.9.12

External links

http://github.com/sudo-project/sudo/commit/bd209b9f16fcd1270c13db27ae3329c677d48050
http://bugzilla.redhat.com/show_bug.cgi?id=2139911
http://www.sudo.ws/releases/stable/#1.9.12p1

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.