Zyxel ATP/USG FLEX/USG FLEX 50(W)/USG20(W)-VPN up to 5.38 FTP os command injection

Summaryinfo

A vulnerability categorized as critical has been discovered in Zyxel ATP, USG FLEX, USG FLEX 50(W) and USG20(W)-VPN up to 5.38. This issue affects some unknown processing of the component FTP. Such manipulation leads to os command injection. This vulnerability is listed as CVE-2024-42059. The attack may be performed from remote. There is no available exploit.

Detailsinfo

A vulnerability was found in Zyxel ATP, USG FLEX, USG FLEX 50(W) and USG20(W)-VPN up to 5.38 and classified as critical. Affected by this issue is an unknown functionality of the component FTP. The manipulation with an unknown input leads to a os command injection vulnerability. Using CWE to declare the problem leads to CWE-78. The product constructs all or part of an OS command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended OS command when it is sent to a downstream component. Impacted is confidentiality, integrity, and availability. CVE summarizes:

A post-authentication command injection vulnerability in Zyxel ATP series firmware versions from V5.00 through V5.38, USG FLEX series firmware versions from V5.00 through V5.38, USG FLEX 50(W) series firmware versions from V5.00 through V5.38, and USG20(W)-VPN series firmware versions from V5.00 through V5.38 could allow an authenticated attacker with administrator privileges to execute some OS commands on an affected device by uploading a crafted compressed language file via FTP.

The advisory is shared for download at zyxel.com. This vulnerability is handled as CVE-2024-42059 since 07/29/2024. The exploitation is known to be easy. The attack may be launched remotely. Additional levels of successful authentication are necessary for exploitation. There are neither technical details nor an exploit publicly available. The current price for an exploit might be approx. USD $5k-$25k (estimation calculated on 09/03/2024). The MITRE ATT&CK project declares the attack technique as T1202.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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Productinfo

Type

• Network Encryption Software

Vendor

• Zyxel

Name

• ATP
• USG20(W)-VPN
• USG FLEX
• USG FLEX 50(W)

Version

• 5.0
• 5.1
• 5.2
• 5.3
• 5.4
• 5.5
• 5.6
• 5.7
• 5.8
• 5.9
• 5.10
• 5.11
• 5.12
• 5.13
• 5.14
• 5.15
• 5.16
• 5.17
• 5.18
• 5.19
• 5.20
• 5.21
• 5.22
• 5.23
• 5.24
• 5.25
• 5.26
• 5.27
• 5.28
• 5.29
• 5.30
• 5.31
• 5.32
• 5.33
• 5.34
• 5.35
• 5.36
• 5.37
• 5.38

License

• commercial

Website

• Vendor: https://www.zyxel.com/

CPE 2.3info

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