CVE-2017-11403 : Security Advisory and Response

An issue was discovered in GraphicsMagick 1.3.26 in the png.c file in the coders directory. The function ReadMNGImage contains a CloseBlob call that is performed in the wrong order, which can lead to a use-after-free vulnerability when processing a specially crafted file.

Understanding CVE-2017-11403

What is CVE-2017-11403?

The vulnerability in GraphicsMagick 1.3.26 allows attackers to exploit a use-after-free vulnerability by manipulating a specific file.

The Impact of CVE-2017-11403

The vulnerability can be exploited by malicious actors to execute arbitrary code or cause a denial of service (DoS) on the affected system.

Technical Details of CVE-2017-11403

Vulnerability Description

The ReadMNGImage function in coders/png.c in GraphicsMagick 1.3.26 has an out-of-order CloseBlob call, resulting in a use-after-free via a crafted file.

Affected Systems and Versions

Product: GraphicsMagick 1.3.26
Vendor: N/A
Version: N/A

Exploitation Mechanism

The vulnerability is exploited by manipulating a specially crafted file to trigger the out-of-order CloseBlob call, leading to a use-after-free condition.

Mitigation and Prevention

Immediate Steps to Take

Apply the security update provided by the vendor.
Avoid opening or processing untrusted image files.
Monitor vendor advisories for any further updates.

Long-Term Security Practices

Regularly update software and apply patches promptly.
Implement proper input validation to prevent malformed files from being processed.
Conduct security assessments and audits regularly.
Educate users on safe computing practices.

Patching and Updates

Ensure that the latest version of GraphicsMagick is installed with all relevant security patches applied.