#VU71208 Link following in AX7501-B0 - CVE-2022-45440

Vulnerability identifier: #VU71208

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-2022-45440

CWE-ID: CWE-59

Exploitation vector: Local

Exploit availability: No

Vulnerable software:
AX7501-B0
Hardware solutions / Firmware

Vendor: ZyXEL Communications Corp.

Description

The vulnerability allows a local user to compromise the target system.

The vulnerability exists due to the FTP server processes symbolic links on external storage media. A local administrator can create a symbolic link on external storage media and access the root file system.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

AX7501-B0: before 5.17(ABPC.3)C0

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External links
https://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-cleartext-storage-of-wifi-credentials-and-improper-symbolic-links-of-ftp-for-ax7501-b0-cpe

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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.