CVE-2019-12495 : What You Need to Know

A vulnerability has been found in Tiny C Compiler (TCC) version 0.9.27, allowing an attacker to perform a one-byte out-of-bounds write in the gsym_addr function.

Understanding CVE-2019-12495

This CVE identifies a security issue in Tiny C Compiler (TCC) version 0.9.27 due to mishandling of section switches in the gsym_addr function.

What is CVE-2019-12495?

CVE-2019-12495 is a vulnerability in Tiny C Compiler (TCC) version 0.9.27 that enables an attacker to execute a one-byte out-of-bounds write by compiling a specially crafted source file.

The Impact of CVE-2019-12495

The vulnerability may be exploited by an attacker to compromise the integrity and security of systems utilizing the affected TCC version.

Technical Details of CVE-2019-12495

This section delves into the technical aspects of the CVE.

Vulnerability Description

The issue arises from a one-byte out-of-bounds write in the gsym_addr function located in x86_64-gen.c due to mishandling of section switches in tccasm.c.

Affected Systems and Versions

Product: Tiny C Compiler (TCC)
Version: 0.9.27

Exploitation Mechanism

The vulnerability can be exploited by compiling a specially crafted source file to trigger the out-of-bounds write in the gsym_addr function.

Mitigation and Prevention

Protecting systems from CVE-2019-12495 requires immediate actions and long-term security practices.

Immediate Steps to Take

Update Tiny C Compiler (TCC) to a patched version that addresses the vulnerability.
Monitor for any unusual activities on the system that could indicate exploitation.

Long-Term Security Practices

Regularly update software and apply security patches promptly.
Conduct security assessments and audits to identify and mitigate vulnerabilities proactively.

Patching and Updates

Ensure that all software components, including Tiny C Compiler (TCC), are regularly updated with the latest security patches to prevent exploitation of known vulnerabilities.