CVE-2019-20334 : Exploit Details and Defense Strategies

Netwide Assembler (NASM) version 2.14.02 is affected by a vulnerability that leads to stack consumption in expr# functions, potentially impacting the relationships among expr0 to expr6 and stdscan in asm/stdscan.c. This issue is reminiscent of CVE-2019-6290 and CVE-2019-6291.

Understanding CVE-2019-20334

This CVE involves a vulnerability in NASM version 2.14.02 that can result in stack consumption in specific functions, affecting the connections between various expressions and stdscan.

What is CVE-2019-20334?

The vulnerability in NASM version 2.14.02 allows for stack consumption in expr# functions, impacting expr0 to expr6 and stdscan in asm/stdscan.c.

The Impact of CVE-2019-20334

The vulnerability could potentially lead to exploitation by malicious actors, compromising the integrity and security of systems using the affected NASM version.

Technical Details of CVE-2019-20334

This section provides more technical insights into the vulnerability.

Vulnerability Description

The issue in NASM version 2.14.02 results in stack consumption within expr# functions, affecting expr0 to expr6 and stdscan in asm/stdscan.c.

Affected Systems and Versions

Affected Version: 2.14.02 of Netwide Assembler (NASM)

Exploitation Mechanism

The vulnerability can be exploited by manipulating the relationships between expr0 to expr6 and stdscan in asm/stdscan.c.

Mitigation and Prevention

Protecting systems from the CVE-2019-20334 vulnerability is crucial for maintaining security.

Immediate Steps to Take

Update NASM to a patched version that addresses the stack consumption issue.
Monitor for any unusual stack behavior that could indicate exploitation.

Long-Term Security Practices

Regularly update software and libraries to prevent known vulnerabilities.
Implement secure coding practices to minimize the risk of stack-related issues.

Patching and Updates

Apply patches provided by NASM promptly to mitigate the vulnerability and enhance system security.