CVE-2019-20352 : Vulnerability Insights and Analysis

A heap-based buffer over-read vulnerability exists in version 2.15rc0 of Netwide Assembler (NASM), allowing exploitation via a specially crafted .asm file.

Understanding CVE-2019-20352

This CVE involves a specific vulnerability in NASM version 2.15rc0.

What is CVE-2019-20352?

This CVE identifies a heap-based buffer over-read flaw in NASM version 2.15rc0, triggered by a malicious .asm file.

The Impact of CVE-2019-20352

The vulnerability can be exploited by executing the set_text_free function during the file's execution, leading to a security compromise.

Technical Details of CVE-2019-20352

This section delves into the technical aspects of the vulnerability.

Vulnerability Description

The vulnerability occurs in the set_text_free function called from expand_one_smacro in the asm/preproc.c file of NASM 2.15rc0.

Affected Systems and Versions

Product: Netwide Assembler (NASM)
Version: 2.15rc0

Exploitation Mechanism

The vulnerability can be exploited by utilizing a specially crafted .asm file to trigger the set_text_free function.

Mitigation and Prevention

Protecting systems from CVE-2019-20352 requires immediate actions and long-term security practices.

Immediate Steps to Take

Update NASM to a patched version or apply vendor-supplied fixes.
Avoid executing untrusted .asm files.

Long-Term Security Practices

Regularly update software and apply security patches.
Implement code reviews and security testing to identify vulnerabilities.
Educate users on safe coding practices and file handling.
Monitor for unusual file execution behavior.
Consider using security tools for code analysis.

Patching and Updates

Ensure timely installation of patches and updates provided by NASM to address the vulnerability.