CVE-2018-6405 : What You Need to Know

ImageMagick before version 7.0.7-23 is vulnerable to a memory leak issue in the ReadDCMImage function, allowing remote attackers to trigger a denial of service attack.

Understanding CVE-2018-6405

The vulnerability in ImageMagick versions prior to 7.0.7-23 allows for the overwriting of specific variables, leading to a memory leak and potential denial of service.

What is CVE-2018-6405?

The ReadDCMImage function in ImageMagick's coders/dcm.c file allows remote attackers to exploit a vulnerability that results in a memory leak, potentially causing a denial of service.

The Impact of CVE-2018-6405

Exploiting this vulnerability can lead to a denial of service attack due to the loss of previous pointers and subsequent memory leaks.

Technical Details of CVE-2018-6405

ImageMagick versions prior to 7.0.7-23 are affected by this vulnerability.

Vulnerability Description

The redmap, greenmap, and bluemap variables in the ReadDCMImage function can be overwritten with new pointers, causing a memory leak.

Affected Systems and Versions

Product: ImageMagick
Vendor: N/A
Versions affected: All versions prior to 7.0.7-23

Exploitation Mechanism

Remote attackers can exploit this vulnerability to overwrite specific variables, leading to memory leaks and denial of service.

Mitigation and Prevention

Immediate action is necessary to address this vulnerability in ImageMagick.

Immediate Steps to Take

Update ImageMagick to version 7.0.7-23 or later.
Monitor for any unusual activity that could indicate exploitation of this vulnerability.

Long-Term Security Practices

Regularly update software to the latest versions to patch known vulnerabilities.
Implement network security measures to prevent remote attacks.

Patching and Updates

Ensure that ImageMagick is regularly updated to the latest version to mitigate the risk of this vulnerability.