CVE-2021-41087 : Vulnerability Insights and Analysis

in-toto-golang is a go implementation of the in-toto framework to protect software supply chain integrity. In affected versions, authenticated attackers posing as functionaries can create attestations that may bypass DISALLOW rules in the same layout, potentially compromising security. This vulnerability has a CVSS base score of 5.6 (Medium).

Understanding CVE-2021-41087

in-toto-golang vulnerability impacting versions prior to 0.3.0

What is CVE-2021-41087?

in-toto-golang allows authenticated attackers to bypass DISALLOW rules and create attestations compromising the security integrity of the software supply chain.

The Impact of CVE-2021-41087

CVSS Base Score: 5.6 (Medium)
Attack Complexity: High
Attack Vector: Local
Integrity Impact: High
Privileges Required: Low

Technical Details of CVE-2021-41087

Vulnerability in in-toto-golang

Vulnerability Description

The vulnerability allows attackers to include disallowed artifacts in attestations by exploiting path traversal semantics, potentially compromising software supply chain integrity.

Affected Systems and Versions

Product: in-toto-golang
Vendor: in-toto
Versions Affected: < 0.3.0

Exploitation Mechanism

Attackers can pose as functionaries within a trusted set of users to issue attestations containing disallowed artifacts, bypassing security rules within the layout.

Mitigation and Prevention

Protecting against CVE-2021-41087

Immediate Steps to Take

Upgrade in-toto-golang to version 0.3.0 to fix the vulnerability.
Review and validate attestations to identify potentially compromised artifacts.

Long-Term Security Practices

Implement strict access controls and verification mechanisms for attestations.
Regularly review and update software supply chain security policies.

Patching and Updates

Apply patches and updates promptly to mitigate security vulnerabilities.