Vulnerability identifier: #VU51809

Vulnerability risk: Low

CVSSv3.1: 6.8 [CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2020-27897

CWE-ID: CWE-787

Exploitation vector: Local

Exploit availability: No

Vulnerable software:
macOS
Operating systems & Components / Operating system

Vendor: Apple Inc.

Description

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

The vulnerability exists due to a boundary error within the handling of numerous IOCTLs in the AppleIntelKBLGraphics kext in Intel Graphics Driver. A local user can run a specially crafted program to  trigger out-of-bounds write and execute arbitrary code on the target system.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

macOS: 10.15 19A583 - 10.15.7 19H15, 10.14 18A391 - 10.14.6 18G6042

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External links
http://support.apple.com/en-us/HT212011
http://www.zerodayinitiative.com/advisories/ZDI-21-388/
http://www.zerodayinitiative.com/advisories/ZDI-21-397/
http://www.zerodayinitiative.com/advisories/ZDI-21-396/
http://www.zerodayinitiative.com/advisories/ZDI-21-395/
http://www.zerodayinitiative.com/advisories/ZDI-21-394/
http://www.zerodayinitiative.com/advisories/ZDI-21-393/
http://www.zerodayinitiative.com/advisories/ZDI-21-392/
http://www.zerodayinitiative.com/advisories/ZDI-21-391/
http://www.zerodayinitiative.com/advisories/ZDI-21-390/
http://www.zerodayinitiative.com/advisories/ZDI-21-387/
http://www.zerodayinitiative.com/advisories/ZDI-21-386/
http://www.zerodayinitiative.com/advisories/ZDI-21-385/
http://www.zerodayinitiative.com/advisories/ZDI-21-384/
http://www.zerodayinitiative.com/advisories/ZDI-21-383/
http://www.zerodayinitiative.com/advisories/ZDI-21-382/
http://www.zerodayinitiative.com/advisories/ZDI-21-381/
http://www.zerodayinitiative.com/advisories/ZDI-21-380/
http://www.zerodayinitiative.com/advisories/ZDI-21-379/
http://www.zerodayinitiative.com/advisories/ZDI-21-378/
http://www.zerodayinitiative.com/advisories/ZDI-21-486/

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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.