CVE-2024-25580: Qt Buffer Overflow Vulnerability

CVE-2024-25580 Overview

A buffer overflow vulnerability has been discovered in the Qt framework's KTX image handler component (gui/util/qktxhandler.cpp). This vulnerability affects Qt versions before 5.15.17, 6.x before 6.2.12, 6.3.x through 6.5.x before 6.5.5, and 6.6.x before 6.6.2. When processing a specially crafted KTX image file, the vulnerable code can trigger a buffer overflow condition that leads to application crashes, resulting in a denial of service condition.

Critical Impact

A malicious KTX image file can trigger a buffer overflow in Qt applications, causing application crashes and denial of service. Any application using Qt's image processing capabilities may be vulnerable when handling untrusted KTX files.

Affected Products

• Qt versions before 5.15.17
• Qt 6.x versions before 6.2.12
• Qt 6.3.x through 6.5.x versions before 6.5.5
• Qt 6.6.x versions before 6.6.2

Discovery Timeline

• 2024-03-27 - CVE CVE-2024-25580 published to NVD
• 2025-11-04 - Last updated in NVD database

Technical Details for CVE-2024-25580

Vulnerability Analysis

This vulnerability is classified as CWE-120 (Buffer Copy without Checking Size of Input), a classic buffer overflow condition. The flaw exists in the Qt framework's KTX (Khronos Texture) image file handler implementation located in gui/util/qktxhandler.cpp. The vulnerability occurs when the KTX handler processes image data from a crafted file without properly validating the size of the input data against the allocated buffer boundaries.

When a malformed KTX file is processed, the handler may attempt to copy more data than the destination buffer can accommodate, resulting in memory corruption. This memory corruption condition leads to application instability and crashes. The attack requires local access to deliver the malicious file to a vulnerable application.

Root Cause

The root cause of this vulnerability lies in insufficient bounds checking during the parsing and processing of KTX image files. The qktxhandler.cpp implementation fails to properly validate input data sizes before performing buffer copy operations. When encountering a maliciously crafted KTX file with manipulated size values, the code proceeds to copy data beyond the allocated buffer boundaries, triggering the buffer overflow condition.

Attack Vector

The attack vector for CVE-2024-25580 requires local access to the target system. An attacker must craft a malicious KTX image file with specially constructed headers or data sections designed to trigger the buffer overflow. The attack succeeds when a vulnerable Qt application attempts to open or process the malicious image file. This could occur through various scenarios including:

• User opening a malicious KTX file in an image viewer application built with Qt
• Applications that automatically process KTX files from untrusted sources
• Development environments that preview KTX texture files

The vulnerability does not require user interaction beyond the normal file opening operation, and no authentication or special privileges are required to trigger the condition. However, successful exploitation results in denial of service through application crashes rather than code execution based on current analysis.

Detection Methods for CVE-2024-25580

Indicators of Compromise

• Unexpected application crashes in Qt-based applications when processing image files
• Crash reports or core dumps referencing qktxhandler.cpp or KTX-related functions
• Presence of suspicious or unusually structured KTX files in application directories
• Repeated application failures when accessing specific image files

Detection Strategies

• Monitor Qt-based applications for abnormal crash patterns during image processing operations
• Implement file integrity monitoring on directories where KTX files are processed
• Deploy endpoint detection rules to identify malformed KTX files based on header anomalies
• Configure application crash reporting to flag KTX handler-related failures

Monitoring Recommendations

• Enable crash dump collection for Qt applications to facilitate post-incident analysis
• Monitor system logs for repeated application failures involving image processing
• Implement file type validation before allowing KTX files to be processed by applications
• Review security advisories from Qt and distribution vendors for updated guidance

How to Mitigate CVE-2024-25580

Immediate Actions Required

• Update Qt framework to patched versions: 5.15.17+, 6.2.12+, 6.5.5+, or 6.6.2+
• Audit applications using Qt to identify those processing KTX image files
• Restrict processing of KTX files from untrusted sources until patches are applied
• Consider disabling KTX image format support if not required by applications

Patch Information

Qt has released security patches addressing this vulnerability. Organizations should update to the following versions or later:

• Qt 5.x: Update to version 5.15.17 or later
• Qt 6.2.x: Update to version 6.2.12 or later
• Qt 6.3.x through 6.5.x: Update to version 6.5.5 or later
• Qt 6.6.x: Update to version 6.6.2 or later

Detailed information about the security fix is available in the Qt Security Advisory. Linux distributions have also released updated packages; see the Fedora Package Announcements for distribution-specific updates.

Workarounds

• Implement input validation to reject KTX files from untrusted sources
• Use application-level sandboxing to contain potential crashes from malicious files
• Configure file type restrictions to prevent automatic processing of KTX images
• Deploy network-level filtering to block KTX files from external sources if feasible

# Verify Qt version on Linux systems
qmake --version

# Check for vulnerable Qt library versions
ldd /path/to/qt-application | grep -i qt

# Update Qt packages on Fedora
sudo dnf update qt5-qtbase qt6-qtbase