#VU66705 Out-of-bounds write in U-Boot - CVE-2022-33103

Vulnerability identifier: #VU66705

Vulnerability risk: Low

CVSSv4.0: 5.9 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2022-33103

CWE-ID: CWE-787

Exploitation vector: Local

Exploit availability: No

Vulnerable software:
U-Boot
Client/Desktop applications / Other client software

Vendor: DENX

Description

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

The vulnerability exists due to a boundary error within the sqfs_readdir() function when reading local directories. A local user can trigger an out-of-bounds write error and execute arbitrary code with elevated privileges.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

U-Boot: 2020.10 rc1 - 2022.07 rc4

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External links
https://lore.kernel.org/all/20220609140206.297405-1-miquel.raynal@bootlin.com/
https://lore.kernel.org/all/CALO=DHFB+yBoXxVr5KcsK0iFdg+e7ywko4-e+72kjbcS8JBfPw@mail.gmail.com/

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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.