CVE-2021-45958 : Security Advisory and Response

UltraJSON (aka ujson) through 5.1.0 has a stack-based buffer overflow in Buffer_AppendIndentUnchecked (called from encode). Exploitation can, for example, use a large amount of indentation.

Understanding CVE-2021-45958

UltraJSON (aka ujson) through version 5.1.0 is impacted by a stack-based buffer overflow vulnerability.

What is CVE-2021-45958?

The vulnerability exists in the Buffer_AppendIndentUnchecked function called from encode in UltraJSON (ujson) versions leading up to 5.1.0. An attacker could exploit this issue to cause a stack-based buffer overflow by utilizing excessive indentation.

The Impact of CVE-2021-45958

The exploitation of this vulnerability could potentially lead to remote code execution or denial of service (DoS) attacks, posing a significant risk to the security and stability of affected systems.

Technical Details of CVE-2021-45958

This section covers the technical aspects of the CVE, including the vulnerability description, affected systems, versions, and exploitation mechanism.

Vulnerability Description

The stack-based buffer overflow in Buffer_AppendIndentUnchecked function can be abused by an attacker through the encode process, allowing the possibility of unauthorized access or system compromise.

Affected Systems and Versions

Product: N/A
Vendor: N/A
Versions: up to 5.1.0

Exploitation Mechanism

The vulnerability can be exploited by manipulating the amount of indentation, triggering the buffer overflow and potentially enabling malicious code execution or service disruption.

Mitigation and Prevention

It's crucial to address CVE-2021-45958 promptly to mitigate the associated risks and secure the impacted systems.

Immediate Steps to Take

Apply the latest security patches provided by the vendor
Consider implementing additional security measures like input validation and boundary checks
Monitor and restrict network access to vulnerable systems

Long-Term Security Practices

Conduct regular security assessments and penetration testing
Stay informed about security advisories and updates for all software components
Enhance user awareness on safe computing practices

Patching and Updates

Keep track of security alerts from relevant sources and ensure timely installation of patches to eliminate this vulnerability.