Privilege escalation in Sudo



| Updated: 2023-05-14
Risk Low
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2021-3156
CWE-ID CWE-122
Exploitation vector Local
Public exploit Vulnerability #1 is being exploited in the wild.
Vulnerable software
 Sudo
Client/Desktop applications / Software for system administration

Vendor Sudo

Security Bulletin

This security bulletin contains information about 1 vulnerabilities.

Updated: 27.01.2021

Changed bulletin status to patched, added information about the patched version.

1) Heap-based buffer overflow

EUVDB-ID: #VU50040

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-2021-3156

CWE-ID: CWE-122 - Heap-based Buffer Overflow

Exploit availability: Yes

Description

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

The vulnerability exists due to a boundary error in sudo. A local user can pass specially crafted data to the application, trigger heap-based buffer overflow and execute arbitrary code on the target system with root privileges.


Mitigation

Install update from vendor's website.

Vulnerable software versions

Sudo: 1.8.0 - 1.9.5p1

CPE2.3 External links

http://www.qualys.com/2021/01/26/cve-2021-3156/baron-samedit-heap-based-overflow-sudo.txt
http://bugzilla.redhat.com/show_bug.cgi?id=1917684
http://access.redhat.com/security/cve/CVE-2021-3156
http://www.sudo.ws/alerts/unescape_overflow.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.



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