CVE-2019-19720 : What You Need to Know

A vulnerability has been found in Yabasic 2.86.1, specifically in the yylex() function located in flex.c. This vulnerability is a result of a crafted BASIC source file, which triggers a heap-based buffer overflow.

Understanding CVE-2019-19720

Yabasic 2.86.1 has a heap-based buffer overflow in the yylex() function in flex.c via a crafted BASIC source file.

What is CVE-2019-19720?

This CVE identifies a vulnerability in Yabasic 2.86.1 that allows a crafted BASIC source file to trigger a heap-based buffer overflow in the yylex() function.

The Impact of CVE-2019-19720

The vulnerability can be exploited by an attacker to execute arbitrary code or cause a denial of service on the affected system.

Technical Details of CVE-2019-19720

Yabasic 2.86.1 is susceptible to a heap-based buffer overflow due to the issue in the yylex() function.

Vulnerability Description

The vulnerability arises from processing a specially crafted BASIC source file, leading to the overflow in the yylex() function in flex.c.

Affected Systems and Versions

Product: Yabasic 2.86.1
Vendor: N/A
Versions: N/A

Exploitation Mechanism

The vulnerability is triggered by a maliciously crafted BASIC source file that exploits the yylex() function, causing a heap-based buffer overflow.

Mitigation and Prevention

It is crucial to take immediate steps to address and prevent the exploitation of CVE-2019-19720.

Immediate Steps to Take

Disable Yabasic if not essential for operations
Implement network controls to restrict access to vulnerable systems
Monitor for any unusual or malicious activities

Long-Term Security Practices

Regularly update and patch Yabasic and related software
Conduct security assessments and penetration testing
Educate users on safe computing practices

Patching and Updates

Check for patches or updates from the official Yabasic website
Apply security patches promptly to mitigate the vulnerability