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CVE-2024-9050

Description

A flaw was found in the libreswan client plugin for NetworkManager (NetkworkManager-libreswan), where it fails to properly sanitize the VPN configuration from the local unprivileged user. In this configuration, composed by a key-value format, the plugin fails to escape special characters, leading the application to interpret values as keys. One of the most critical parameters that could be abused by a malicious user is the `leftupdown`key. This key takes an executable command as a value and is used to specify what executes as a callback in NetworkManager-libreswan to retrieve configuration settings back to NetworkManager. As NetworkManager uses Polkit to allow an unprivileged user to control the system's network configuration, a malicious actor could achieve local privilege escalation and potential code execution as root in the targeted machine by creating a malicious configuration.

POC

Reference

- http://www.openwall.com/lists/oss-security/2024/10/25/1

- https://bugzilla.redhat.com/show_bug.cgi?id=2313828

- https://www.openwall.com/lists/oss-security/2024/10/25/1

Github

- https://github.com/fkie-cad/nvd-json-data-feeds