CVE-2021-39593 : Security Advisory and Response

This CVE-2021-39593 article provides details about a vulnerability found in swftools through 20200710, leading to a NULL pointer dereference in the function swf_FontExtract_DefineFontInfo() in swftext.c, potentially causing a Denial of Service.

Understanding CVE-2021-39593

swftools through 20200710 is vulnerable to a NULL pointer dereference in swf_FontExtract_DefineFontInfo() function, potentially enabling attackers to execute a Denial of Service attack.

What is CVE-2021-39593?

This CVE identifies a vulnerability in swftools through 20200710 that allows attackers to trigger a NULL pointer dereference in the swf_FontExtract_DefineFontInfo() function, capable of causing a Denial of Service.

The Impact of CVE-2021-39593

The vulnerability could be exploited by threat actors to disrupt the functionality of swftools through 20200710, leading to Denial of Service attacks.

Technical Details of CVE-2021-39593

This section delves into specific technical aspects of the vulnerability.

Vulnerability Description

An issue in swftools through 20200710 exposes a NULL pointer dereference in the swf_FontExtract_DefineFontInfo() function in swftext.c, providing an opportunity for attackers to conduct Denial of Service attacks.

Affected Systems and Versions

Affected Product: Not applicable
Affected Vendor: Not applicable
Affected Version: Not applicable

Exploitation Mechanism

Attackers can exploit the vulnerability by supplying crafted input to the swf_FontExtract_DefineFontInfo() function, leading to the NULL pointer dereference issue.

Mitigation and Prevention

To address CVE-2021-39593, users and organizations should take the following steps.

Immediate Steps to Take

Implement patches provided by the software vendor.
Monitor software updates and apply security fixes promptly.
Restrict network access to the affected systems.

Long-Term Security Practices

Conduct regular security assessments and penetration testing.
Educate developers on secure coding practices.
Employ security tools to detect and prevent vulnerabilities.

Patching and Updates

Regularly check for updates and patches from the swftools provider.
Apply updates as soon as they are released to secure the software.