Privilege escalation in IBM VIOS ksh

1) Security restrictions bypass

EUVDB-ID: #VU55457

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-2021-29741

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

Exploit availability: No

Description

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

The vulnerability exists due to unspecified error within Korn Shell (ksh). A local user can execute arbitrary code on the system with root privileges.

Mitigation

Install update from vendor's website.

Vulnerable software versions

IBM VIOS: 3.1.0 - 3.1.2

External links

http://aix.software.ibm.com/aix/efixes/security/ksh_advisory.asc

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.