CVE-2017-0903 : Security Advisory and Response

RubyGems versions between 2.0.0 and 2.6.13 are vulnerable to a possible remote code execution due to a YAML deserialization issue.

Understanding CVE-2017-0903

Versions of RubyGems from 2.0.0 to 2.6.13 have a vulnerability that could lead to remote code execution through crafted serialized objects.

What is CVE-2017-0903?

The vulnerability in RubyGems allows attackers to execute remote code by exploiting the YAML deserialization process of gem specifications.

The Impact of CVE-2017-0903

Remote code execution risk due to bypassing class white lists in YAML deserialization
Attackers can create malicious serialized objects to exploit the vulnerability

Technical Details of CVE-2017-0903

RubyGems vulnerability details and affected systems.

Vulnerability Description

Vulnerability in RubyGems versions 2.0.0 to 2.6.13
Risk of remote code execution through crafted serialized objects

Affected Systems and Versions

Product: RubyGems
Vendor: HackerOne
Affected Versions: Versions >= 2.0.0

Exploitation Mechanism

Attackers exploit the YAML deserialization process of gem specifications
Crafted serialized objects can bypass class white lists

Mitigation and Prevention

Steps to mitigate and prevent the CVE-2017-0903 vulnerability.

Immediate Steps to Take

Update RubyGems to a non-vulnerable version
Monitor for any signs of unauthorized code execution

Long-Term Security Practices

Regularly update software and dependencies
Implement code review processes to detect vulnerabilities early

Patching and Updates

Apply patches provided by RubyGems to fix the vulnerability