CVE-2021-3593 : Security Advisory and Response

An invalid pointer initialization issue was found in the SLiRP networking implementation of QEMU. This flaw affects libslirp versions prior to 4.6.0.

Understanding CVE-2021-3593

This CVE describes a vulnerability in the udp6_input() function of QEMU's SLiRP networking implementation that could lead to out-of-bounds read access or indirect host memory disclosure to the guest, affecting data confidentiality.

What is CVE-2021-3593?

CVE-2021-3593 is an invalid pointer initialization vulnerability in QEMU's SLiRP networking implementation, impacting libslirp versions before 4.6.0.

The Impact of CVE-2021-3593

The highest risk posed by this vulnerability is to data confidentiality as it could result in out-of-bounds read access or indirect host memory disclosure to the guest system.

Technical Details of CVE-2021-3593

This section provides detailed technical insights into the vulnerability.

Vulnerability Description

The flaw occurs in the udp6_input() function while processing a udp packet smaller than the 'udphdr' structure, potentially leading to out-of-bounds read access or memory disclosure.

Affected Systems and Versions

The vulnerability affects libslirp versions earlier than 4.6.0, impacting QEMU installations utilizing these versions.

Exploitation Mechanism

Exploitation of this vulnerability could allow threat actors to access unauthorized data or trigger memory disclosure to the guest system.

Mitigation and Prevention

Learn how to protect your systems and data from CVE-2021-3593.

Immediate Steps to Take

Users are advised to update QEMU to version 4.6.0 or later to mitigate this vulnerability and enhance system security.

Long-Term Security Practices

Implementing robust network security measures and regular software updates can help prevent similar vulnerabilities in the future.

Patching and Updates

Stay informed about security advisories and promptly apply patches and updates to keep your systems secure.