ZyXEL NAS 326 up to 5.21 Python Web Server code injection

Summaryinfo

A vulnerability was found in ZyXEL NAS 326 up to 5.21. It has been classified as critical. This issue affects some unknown processing of the component Python Web Server. This manipulation causes code injection. The identification of this vulnerability is CVE-2019-10633. It is possible to initiate the attack remotely. There is no exploit available.

Detailsinfo

A vulnerability has been found in ZyXEL NAS 326 up to 5.21 and classified as critical. Affected by this vulnerability is an unknown code block of the component Python Web Server. The manipulation with an unknown input leads to a code injection vulnerability. The CWE definition for the vulnerability is CWE-94. The product constructs all or part of a code segment using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the syntax or behavior of the intended code segment. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

An eval injection vulnerability in the Python web server routing on the Zyxel NAS 326 version 5.21 and below allows a remote authenticated attacker to execute arbitrary code via the tjp6jp6y4, simZysh, and ck6fup6 APIs.

The bug was discovered 04/04/2019. The weakness was shared 04/09/2019. This vulnerability is known as CVE-2019-10633 since 03/29/2019. The attack can be launched remotely. The requirement for exploitation is a single authentication. The technical details are unknown and an exploit is not publicly available. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 08/27/2023). The attack technique deployed by this issue is T1059 according to MITRE ATT&CK.

The vulnerability was handled as a non-public zero-day exploit for at least 5 days. During that time the estimated underground price was around $0-$5k.

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

The entries VDB-133160, VDB-133158, VDB-133157 and VDB-133156 are related to this item. Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

Vendor

• ZyXEL

Name

• NAS 326

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

License

• commercial

Website

• Vendor: https://www.zyxel.com/

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