#VU47660 Out-of-bounds write in F2fs.Fsck - CVE-2020-6108

Vulnerability identifier: #VU47660

Vulnerability risk: Low

CVSSv4.0: 5.7 [CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2020-6108

CWE-ID: CWE-787

Exploitation vector: Local

Exploit availability: No

Vulnerable software:
F2fs.Fsck
Other software / Other software solutions

Vendor: F2fs-Tools

Description

The vulnerability allows a local user to compromise vulnerable system.

The vulnerability exists due to a boundary error in the "fsck_chk_orphan_node" functionality. A local administrator can use a specially crafted f2fs filesystem, trigger out-of-bounds write and execute arbitrary code on the target system.

Mitigation
Cybersecurity Help is currently unaware of any official solution to address this vulnerability.

Vulnerable software versions

F2fs.Fsck: 1.13

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External links
https://www.talosintelligence.com/vulnerability_reports/TALOS-2020-1050

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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.