CVE-2017-5923 : Security Advisory and Response

A vulnerability in the YARA 3.5.0 libyara/grammar.y file can be exploited by remote attackers to disrupt the service due to mishandling of a specially crafted rule in the yara_yyparse function, leading to a heap-based out-of-bounds read and application crash.

Understanding CVE-2017-5923

This CVE entry describes a vulnerability in YARA 3.5.0 that allows remote attackers to cause a denial of service by triggering a heap-based out-of-bounds read and application crash.

What is CVE-2017-5923?

YARA 3.5.0 is susceptible to a vulnerability that can be exploited remotely to disrupt services. The issue arises from mishandling a specially crafted rule in the yara_yyparse function.

The Impact of CVE-2017-5923

The vulnerability can lead to a denial of service condition, causing the application to crash due to a heap-based out-of-bounds read triggered by remote attackers.

Technical Details of CVE-2017-5923

YARA 3.5.0 is affected by a specific vulnerability that can be further detailed as follows:

Vulnerability Description

The vulnerability in YARA 3.5.0 allows remote attackers to perform a denial of service attack through a crafted rule mishandled in the yara_yyparse function.

Affected Systems and Versions

Product: N/A
Vendor: N/A
Version: N/A

Exploitation Mechanism

The vulnerability is exploited by remote attackers through a specially crafted rule in the yara_yyparse function, leading to a heap-based out-of-bounds read and application crash.

Mitigation and Prevention

To address CVE-2017-5923, consider the following mitigation strategies:

Immediate Steps to Take

Apply vendor patches or updates promptly.
Monitor security advisories for any new information.

Long-Term Security Practices

Regularly update and patch software to prevent vulnerabilities.
Implement network security measures to detect and block malicious activities.

Patching and Updates

Ensure timely installation of patches and updates to mitigate the risk of exploitation.