Privilege escalation in IBM AIX lscore



Published: 2022-01-10
Risk Low
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2021-38991
CWE-ID CWE-78
Exploitation vector Local
Public exploit N/A
Vulnerable software
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IBM AIX
Operating systems & Components / Operating system

Vendor IBM Corporation

Security Bulletin

This security bulletin contains one low risk vulnerability.

1) OS Command Injection

EUVDB-ID: #VU59357

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-2021-38991

CWE-ID: CWE-78 - Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')

Exploit availability: No

Description

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

The vulnerability exists due to improper input validation in the lscore command. A local user can pass specially crafted data to the the lscore command and execute arbitrary code with elevated privileges.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

IBM AIX: 7.1 - 7.3

External links

http://aix.software.ibm.com/aix/efixes/security/lscore_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.



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