CVE-2020-29529 : Exploit Details and Defense Strategies

HashiCorp go-slug up to 0.4.3 had a vulnerability that allowed directory traversal while unpacking tar archives, potentially leading to bypassing protections with specific symlink constructions. The issue was resolved in version 0.5.0.

Understanding CVE-2020-29529

This CVE involves a security vulnerability in HashiCorp go-slug versions up to 0.4.3 that could be exploited to bypass directory traversal protections.

What is CVE-2020-29529?

CVE-2020-29529 is a vulnerability in HashiCorp go-slug versions up to 0.4.3 that could allow attackers to bypass directory traversal protections during the unpacking of tar archives.

The Impact of CVE-2020-29529

The vulnerability could be exploited to bypass security measures and potentially lead to unauthorized access or manipulation of files on the system.

Technical Details of CVE-2020-29529

HashiCorp go-slug vulnerability details and affected systems.

Vulnerability Description

HashiCorp go-slug up to 0.4.3 did not fully protect against directory traversal during tar archive unpacking.
Specific constructions of multiple symlinks could bypass protections.

Affected Systems and Versions

Product: n/a
Vendor: n/a
Versions affected: up to 0.4.3

Exploitation Mechanism

Attackers could exploit the vulnerability by manipulating symlinks to bypass directory traversal protections.

Mitigation and Prevention

Steps to mitigate and prevent the CVE-2020-29529 vulnerability.

Immediate Steps to Take

Upgrade to version 0.5.0 or later of HashiCorp go-slug to address the vulnerability.
Monitor for any unusual file access or changes that could indicate exploitation.

Long-Term Security Practices

Regularly update software and dependencies to patch known vulnerabilities.
Implement proper file system permissions and access controls to limit the impact of potential attacks.

Patching and Updates

Ensure all systems are updated to version 0.5.0 or above to mitigate the vulnerability.