Overview
The cybersecurity landscape is constantly evolving, with new vulnerabilities being discovered regularly. One such vulnerability, identified as CVE-2025-8067, poses a significant risk to systems using the Udisks daemon. This flaw enables unprivileged users to create loop devices via the D-BUS system, potentially leading to system compromise or data leakage. Given the ubiquity of the D-BUS system in Unix-like operating systems, this vulnerability has far-reaching implications and requires immediate attention.
Vulnerability Summary
CVE ID: CVE-2025-8067
Severity: High (CVSS:8.5)
Attack Vector: Local
Privileges Required: Low
User Interaction: Required
Impact: Potential system compromise or data leakage
Affected Products
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Product | Affected Versions
Udisks 2 | Versions prior to 2.9.0
How the Exploit Works
The CVE-2025-8067 vulnerability is rooted in the Udisks daemon’s flawed handling of requests sent through the D-BUS interface. Specifically, the daemon fails to validate the lower bound of a file descriptor index, which it receives as part of a request to create a loop device. This negligence allows an attacker to input a negative index value, which can cause the daemon to crash. More critically, the flaw can be exploited to perform a local privilege escalation, thereby providing the attacker unauthorized access to files owned by privileged users.
Conceptual Example Code
Here’s a conceptual example of how an attacker might exploit this flaw using a shell command:
#!/bin/bash
dbus-send --system --print-reply --dest=org.freedesktop.UDisks2 /org/freedesktop/UDisks2/Manager \
org.freedesktop.UDisks2.Manager.LoopSetup \
array:byte:[negative index value] \
dict:string:string:{"read-only","false"}This script sends a D-BUS message to the UDisks daemon, requesting the creation of a new loop device with a negative index value. If the daemon processes this request, it will either crash or escalate the privileges of the user who sent the request.
