CVE-2005-0079 in xtrlock
Summary
by MITRE
Buffer overflow in xtrlock 2.0 allows local users to cause a denial of service (application crash) and hijack the desktop session.
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Analysis
by VulDB Data Team • 05/29/2019
The vulnerability identified as CVE-2005-0079 represents a critical buffer overflow flaw within the xtrlock 2.0 screen locking utility, which operates as a desktop security mechanism designed to protect user sessions from unauthorized access. This particular implementation flaw exists within the application's handling of input data, specifically when processing user-provided parameters or configuration values that are not properly validated or constrained. The xtrlock utility functions as a simple yet essential component in graphical desktop environments, providing a method to lock the screen and require authentication before granting access to the system. The buffer overflow vulnerability arises from inadequate bounds checking mechanisms that fail to verify the size of incoming data before copying it into fixed-size memory buffers, creating an exploitable condition that can be leveraged by malicious actors.
The technical nature of this buffer overflow vulnerability stems from the improper memory management practices within the xtrlock application's source code, where character arrays or memory blocks are allocated with predetermined sizes but receive input data without sufficient validation. When local users provide specially crafted input sequences that exceed the allocated buffer boundaries, the overflow condition occurs, causing adjacent memory locations to be overwritten with unexpected data. This memory corruption typically manifests through application crashes due to segmentation faults or access violations, but more critically, it can be exploited to manipulate the execution flow of the process. The vulnerability operates at the kernel level within the desktop session management framework, making it particularly dangerous as it can be exploited by users who already have access to the system but lack administrative privileges, effectively allowing privilege escalation through session hijacking.
The operational impact of this vulnerability extends beyond simple denial of service conditions, as it creates opportunities for sophisticated session manipulation attacks that can compromise the integrity of the desktop environment. Local users can exploit this condition to not only crash the xtrlock application but potentially redirect the execution flow to execute arbitrary code within the context of the desktop session. This capability enables attackers to gain unauthorized access to user sessions, steal sensitive information, or manipulate the graphical interface to perform malicious activities. The vulnerability affects systems where xtrlock 2.0 is installed and actively used as the primary screen locking mechanism, making it particularly concerning for environments where desktop security is paramount. The attack vector requires local access to the system, but the potential consequences are severe enough to warrant immediate attention and remediation efforts.
Mitigation strategies for this vulnerability should focus on immediate patching of the xtrlock application to address the buffer overflow condition through proper input validation and memory boundary checking. System administrators should ensure that all instances of xtrlock 2.0 are updated to versions that contain proper bounds checking mechanisms and input sanitization routines. Additional defensive measures include implementing proper access controls to limit local user privileges, monitoring for abnormal application behavior, and establishing robust application whitelisting policies that prevent unauthorized modifications to security-critical utilities. The vulnerability aligns with CWE-121, which describes stack-based buffer overflow conditions, and represents a classic example of improper input validation that can lead to both denial of service and privilege escalation scenarios. From an ATT&CK framework perspective, this vulnerability maps to techniques involving privilege escalation and defense evasion, as attackers can leverage the compromised screen locking utility to maintain persistent access to user sessions while avoiding detection through legitimate system utilities. Organizations should also consider implementing network-based monitoring solutions that can detect anomalous behavior patterns indicative of buffer overflow exploitation attempts and establish incident response procedures specifically tailored to address desktop session hijacking scenarios.