Privilege escalation in EDK2

1) Integer overflow

EUVDB-ID: #VU95180

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-2022-36765

CWE-ID: CWE-190 - Integer overflow

Exploit availability: No

Description

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

The vulnerability exists due to integer overflow within the CreateHob() function. A local user can trigger an integer overflow and execute arbitrary code on the target system.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

edk2: edk2-stable201808 - UDK2018

CPE2.3

• cpe:2.3:h:tianocore:edk2:edk2-stable202311:*:*:*:*:*:*:*
• cpe:2.3:h:tianocore:edk2:edk2-stable202308:*:*:*:*:*:*:*
• cpe:2.3:h:tianocore:edk2:edk2-stable202305:*:*:*:*:*:*:*

External links

http://github.com/tianocore/edk2/security/advisories/GHSA-ch4w-v7m3-g8wx
http://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/SJ42V7O7F4OU6R7QSQQECLB6LDHKZIMQ/

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.