CVE-2021-39293 : Security Advisory and Response
Understand the impact and technical details of CVE-2021-39293 affecting Go versions before 1.16.8 and 1.17.1. Learn mitigation steps and best security practices.
This CVE record addresses a vulnerability in the archive/zip package in Go affecting versions before 1.16.8 and 1.17.x before 1.17.1, which can lead to a panic due to a crafted archive header.
Understanding CVE-2021-39293
This section provides insights into the nature and impact of the CVE-2021-39293 vulnerability.
What is CVE-2021-39293?
CVE-2021-39293 is a vulnerability in the archive/zip package in Go versions prior to 1.16.8 and 1.17.x before 1.17.1. It arises due to a specifically crafted archive header that erroneously indicates the presence of numerous files, potentially triggering a panic when using NewReader or OpenReader.
The Impact of CVE-2021-39293
The vulnerability can be exploited to cause a panic, impacting the stability and reliability of applications utilizing affected Go versions.
Technical Details of CVE-2021-39293
Delve deeper into the technical aspects of CVE-2021-39293.
Vulnerability Description
The vulnerability stems from an incomplete fix for CVE-2021-33196, allowing a maliciously crafted archive header to trigger a panic when certain functions are called.
Affected Systems and Versions
- Vendor: n/a
- Product: n/a
- Affected Versions: All versions before 1.16.8 and 1.17.x before 1.17.1
Exploitation Mechanism
The issue arises when an archive is crafted with misleading metadata, suggesting the presence of numerous files, causing panic in certain reader functions.
Mitigation and Prevention
Learn how to mitigate the risks associated with CVE-2021-39293.
Immediate Steps to Take
- Update affected Go versions to 1.16.8 or 1.17.1 to apply the necessary patches.
- Exercise caution when processing archives, especially from untrusted sources.
Long-Term Security Practices
- Regularly monitor and apply updates from Go to address any security vulnerabilities promptly.
- Implement secure coding practices to mitigate risks related to archive processing.
Patching and Updates
Ensure timely application of patches and updates provided by the Go project to address CVE-2021-39293.