CVE-2017-17913 : Security Advisory and Response

GraphicsMagick 1.4 snapshot-20171217 Q8 has a stack-based buffer over-read vulnerability in WriteWEBPImage in coders/webp.c, impacting libwebp versions 0.5.0 and newer.

Understanding CVE-2017-17913

This CVE involves a specific version of GraphicsMagick and a compatibility issue with libwebp versions.

What is CVE-2017-17913?

The vulnerability in GraphicsMagick's WriteWEBPImage function allows a stack-based buffer over-read due to a compatibility problem with libwebp versions 0.5.0 and later.

The Impact of CVE-2017-17913

Attackers can exploit this vulnerability to read sensitive information from the memory stack.
Affected systems may experience crashes or potential execution of arbitrary code.

Technical Details of CVE-2017-17913

GraphicsMagick version 1.4 snapshot-20171217 Q8 is susceptible to a stack-based buffer over-read in the WriteWEBPImage function.

Vulnerability Description

The issue arises from a compatibility problem with libwebp versions 0.5.0 and newer, which use a different structure type, leading to the buffer over-read.

Affected Systems and Versions

Affected Version: 1.4 snapshot-20171217 Q8 of GraphicsMagick
Vulnerable Systems: Those using libwebp versions 0.5.0 and above

Exploitation Mechanism

Attackers can exploit this vulnerability by crafting a malicious image file that triggers the buffer over-read when processed by the WriteWEBPImage function.

Mitigation and Prevention

To address CVE-2017-17913, follow these mitigation strategies:

Immediate Steps to Take

Update GraphicsMagick to a patched version that resolves the buffer over-read issue.
Consider restricting access to vulnerable systems to trusted entities.

Long-Term Security Practices

Regularly update software and libraries to prevent known vulnerabilities.
Implement network security measures to detect and block malicious activities.

Patching and Updates

Apply patches provided by GraphicsMagick to fix the stack-based buffer over-read vulnerability.