#VU65038 UNIX symbolic link following in MediaTek products - CVE-2022-21770

Vulnerability identifier: #VU65038

Vulnerability risk: Low

CVSSv4.0: 1.1 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2022-21770

CWE-ID: CWE-61

Exploitation vector: Local

Exploit availability: No

Vulnerable software:
MT6781
Hardware solutions / Firmware
MT6877
Hardware solutions / Firmware
MT6893
Hardware solutions / Firmware
MT8797
Hardware solutions / Firmware
MT6879
Mobile applications / Mobile firmware & hardware
MT6895
Mobile applications / Mobile firmware & hardware
MT6983
Mobile applications / Mobile firmware & hardware
MT8791
Mobile applications / Mobile firmware & hardware
MT8798
Mobile applications / Mobile firmware & hardware

Vendor: MediaTek

Description

The vulnerability allows a local application to gain access to sensitive information.

The vulnerability exists due to a symlink following issue. A local application can use a specially crafted symbolic link to a critical file on the system and gain access to sensitive information.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

MT6781: All versions

MT6877: All versions

MT6879: All versions

MT6893: All versions

MT6895: All versions

MT6983: All versions

MT8791: All versions

MT8797: All versions

MT8798: All versions

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External links
https://corp.mediatek.com/product-security-bulletin/July-2022

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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.