CVE-2019-9754 : Exploit Details and Defense Strategies

Tiny C Compiler (TinyCC or TCC) version 0.9.27 is affected by a vulnerability that allows an out-of-bounds write when compiling manipulated source files.

Understanding CVE-2019-9754

This CVE identifies a specific issue in the Tiny C Compiler version 0.9.27, leading to a potential security risk.

What is CVE-2019-9754?

An out-of-bounds write vulnerability occurs in the end_macro function within the tccpp.c file when compiling a manipulated source file using Tiny C Compiler.

The Impact of CVE-2019-9754

The vulnerability could be exploited by an attacker to execute arbitrary code or cause a denial of service by crashing the application.

Technical Details of CVE-2019-9754

Tiny C Compiler version 0.9.27 is susceptible to an out-of-bounds write vulnerability when processing specific source files.

Vulnerability Description

The issue arises due to improper bounds checking in the end_macro function, allowing an attacker to write beyond the allocated memory space.

Affected Systems and Versions

Product: Tiny C Compiler (TinyCC or TCC)
Version: 0.9.27

Exploitation Mechanism

By crafting a malicious source file, an attacker can trigger the out-of-bounds write in the end_macro function, potentially leading to code execution or application crashes.

Mitigation and Prevention

To address CVE-2019-9754, follow these mitigation strategies:

Immediate Steps to Take

Update Tiny C Compiler to a patched version that addresses the out-of-bounds write vulnerability.
Avoid compiling untrusted or manipulated source files with the affected version.

Long-Term Security Practices

Regularly monitor security advisories for Tiny C Compiler and apply updates promptly.
Implement secure coding practices to prevent buffer overflows and other memory-related vulnerabilities.

Patching and Updates

Check for official patches or updates released by the Tiny C Compiler project to fix the vulnerability.