CVE-2021-39255 : What You Need to Know

This CVE record pertains to a vulnerability in NTFS-3G where a crafted NTFS image can trigger an out-of-bounds read due to an invalid attribute.

Understanding CVE-2021-39255

This section provides an overview of the CVE-2021-39255.

What is CVE-2021-39255?

CVE-2021-39255 is a vulnerability in NTFS-3G that allows a crafted NTFS image to trigger an out-of-bounds read by exploiting an invalid attribute in ntfs_attr_find_in_attrdef, affecting versions of NTFS-3G prior to 2021.8.22.

The Impact of CVE-2021-39255

The vulnerability can potentially lead to information disclosure or denial of service attacks, exploiting the out-of-bounds read capability.

Technical Details of CVE-2021-39255

This section delves into the technical aspects of the CVE-2021-39255.

Vulnerability Description

The vulnerability arises from an invalid attribute in ntfs_attr_find_in_attrdef, allowing a crafted NTFS image to trigger an out-of-bounds read.

Affected Systems and Versions

Vendor: n/a
Product: n/a
Versions: NTFS-3G versions prior to 2021.8.22.

Exploitation Mechanism

The exploit involves crafting a malicious NTFS image with an invalid attribute, triggering the out-of-bounds read in affected NTFS-3G versions.

Mitigation and Prevention

In this section, mitigation strategies for CVE-2021-39255 are discussed.

Immediate Steps to Take

Update NTFS-3G to version 2021.8.22 or later.
Avoid opening NTFS images from untrusted or unknown sources.
Implement file system monitoring to detect any suspicious activity related to NTFS images.

Long-Term Security Practices

Regularly update software and apply patches promptly.
Conduct security assessments to identify and remediate vulnerabilities proactively.

Patching and Updates

Ensure timely patching of the NTFS-3G software to the latest version to mitigate the CVE-2021-39255 vulnerability.