KaiOS 3.0 Web Server tctweb_server os command injection

Summaryinfo

A vulnerability, which was classified as critical, has been found in KaiOS 3.0. Affected is an unknown function of the file /system/bin/tctweb_server of the component Web Server. This manipulation causes os command injection. This vulnerability is tracked as CVE-2023-33294. The attack is possible to be carried out remotely. No exploit exists. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability has been found in KaiOS 3.0 and classified as critical. Affected by this vulnerability is an unknown functionality of the file /system/bin/tctweb_server of the component Web Server. The manipulation with an unknown input leads to a os command injection vulnerability. The CWE definition for the vulnerability is 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. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

An issue was discovered in KaiOS 3.0 before 3.1. The /system/bin/tctweb_server binary exposes a local web server that responds to GET and POST requests on port 2929. The server accepts arbitrary Bash commands and executes them as root. Because it is not permission or context restricted and returns proper CORS headers, it's accessible to all websites via the browser. At a bare minimum, this allows an attacker to retrieve a list of the user's installed apps, notifications, and downloads. It also allows an attacker to delete local files and modify system properties including the boolean persist.moz.killswitch property (which would render the device inoperable). This vulnerability is partially mitigated by SELinux which prevents reads, writes, or modifications to files or permissions within protected partitions.

The weakness was disclosed 05/22/2023. The advisory is shared at kaios.dev. This vulnerability is known as CVE-2023-33294 since 05/22/2023. Technical details are known, but no exploit is available. MITRE ATT&CK project uses the attack technique T1202 for this issue.

Upgrading to version 3.1 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2023-37457). Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Name

• KaiOS

Version

• 3.0

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CPE 2.2info

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Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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