CVE-2021-39257 : Vulnerability Insights and Analysis

This CVE record addresses a vulnerability in NTFS-3G that can lead to a stack consumption due to an endless recursive function call chain.

Understanding CVE-2021-39257

This section will provide insights into the nature of the vulnerability identified as CVE-2021-39257.

What is CVE-2021-39257?

The vulnerability arises from a crafted NTFS image with an unallocated bitmap causing an endless recursive function call chain in NTFS-3G < 2021.8.22, resulting in stack consumption.

The Impact of CVE-2021-39257

The vulnerability can be exploited to cause a denial of service condition due to excessive stack consumption, impacting the availability of the affected systems.

Technical Details of CVE-2021-39257

This section will delve into the technical aspects of the CVE-2021-39257 vulnerability.

Vulnerability Description

CVE-2021-39257 involves a crafted NTFS image triggering an endless recursive function call chain in NTFS-3G < 2021.8.22, leading to excessive stack consumption.

Affected Systems and Versions

Vendor: n/a
Product: n/a
Versions Affected: n/a (all versions are affected)

Exploitation Mechanism

The exploitation involves crafting a malicious NTFS image with an unallocated bitmap to initiate a recursive loop in the ntfs_attr_pwrite function, leading to stack consumption.

Mitigation and Prevention

This section provides guidance on mitigating the risks associated with CVE-2021-39257.

Immediate Steps to Take

Update NTFS-3G to version 2021.8.22 or above to mitigate the vulnerability.
Avoid loading or mounting untrusted or crafted NTFS images to prevent exploitation.

Long-Term Security Practices

Regularly monitor vendor security advisories for updates related to NTFS-3G.
Implement stack protection mechanisms to limit the impact of stack consumption vulnerabilities.

Patching and Updates

Apply patches provided by the NTFS-3G project promptly to address known vulnerabilities and ensure system security.