CVE-2015-7673

What it actually does

Heap memory is accessed after an allocation failure in io-tga.c during Truevision TGA file parsing, resulting in a heap-based buffer overflow that can lead to application crash or arbitrary code execution.

Why it matters to the business

Applications and systems that render or process image files may crash or be compromised when handling specially crafted TGA images, leading to service disruption and potential loss of control over affected workstations or servers.

How an attack unfolds

An attacker creates a malformed TGA file designed to trigger an allocation failure in the parser; when a victim application opens or previews the file, the flawed code path dereferences invalid heap memory, enabling overflow and potential code execution.

How to fix it

Upgrade gdk-pixbuf to version 2.32.0 or later on all affected systems; replace vulnerable packages in distributions such as openSUSE and GNOME environments.

How to confirm the fix worked

Verify installed gdk-pixbuf version is at least 2.32.0; attempt to open a known triggering TGA test file in an isolated environment and confirm absence of crash or overflow behavior.

Typical attack path

1. Craft malicious TGA image file that forces allocation failure in io-tga.c
2. Deliver file to target via email, web download, or shared storage
3. Victim application loads or renders the image using gdk-pixbuf
4. Parser enters error path that reuses freed heap memory
5. Buffer overflow occurs, enabling crash or code execution

How to detect it

Review application crash logs and core dumps for references to io-tga.c or gdk-pixbuf during TGA file handling; correlate with file access events involving .tga extensions from untrusted sources.

What your security team should do

• Prioritize patching gdk-pixbuf to 2.32.0 or newer across all image-processing hosts
• Block or sanitize untrusted TGA files at email gateways and file upload points until patches are applied
• Monitor for application crashes when handling image files as a temporary detection signal