CVE-2020-29573 : Security Advisory and Response

A stack-based buffer overflow vulnerability in the GNU C Library (glibc) before version 2.23 on x86 targets can lead to exploitation if specific input conditions are met.

Understanding CVE-2020-29573

This CVE describes a potential security issue in the GNU C Library (glibc) that could allow attackers to trigger a buffer overflow under certain conditions.

What is CVE-2020-29573?

The vulnerability arises in the handling of 80-bit long double inputs with non-canonical bit patterns in printf family functions, potentially leading to a stack-based buffer overflow.

The Impact of CVE-2020-29573

If successfully exploited, this vulnerability could allow attackers to execute arbitrary code or crash the application, posing a significant security risk to affected systems.

Technical Details of CVE-2020-29573

This section provides more in-depth technical insights into the vulnerability.

Vulnerability Description

The issue occurs in sysdeps/i386/ldbl2mpn.c in glibc before version 2.23 on x86 targets due to a stack-based buffer overflow triggered by specific input patterns.

Affected Systems and Versions

The vulnerability affects GNU C Library versions prior to 2.23 on x86 targets.

Exploitation Mechanism

Exploitation involves passing an 80-bit long double with a non-canonical bit pattern to sprintf, such as \x00\x04\x00\x00\x00\x00\x00\x00\x00\x04.

Mitigation and Prevention

Protecting systems from CVE-2020-29573 requires immediate actions and long-term security practices.

Immediate Steps to Take

Update glibc to version 2.23 or later to mitigate the vulnerability.
Monitor for any unusual activities that could indicate exploitation attempts.

Long-Term Security Practices

Regularly apply security patches and updates to all software components.
Implement secure coding practices to prevent buffer overflows and other common vulnerabilities.

Patching and Updates

Stay informed about security advisories and promptly apply patches released by the glibc maintainers.