How the Mentioned CVE Works:
CVE-2025-1234 is an out-of-bounds read vulnerability in the Ruby JSON parser. This vulnerability occurs when parsing a specially crafted JSON document, causing the parser to read data outside the intended memory boundaries. This can lead to a crash or potential information disclosure. The issue stems from improper boundary checks in the JSON parsing logic, specifically in versions 2.10.0 and 2.10.1 of the Ruby JSON gem. Attackers can exploit this by sending malicious JSON payloads to applications using the vulnerable gem, potentially causing denial of service or leaking sensitive memory contents.
DailyCVE Form:
Platform: Ruby
Version: 2.10.0, 2.10.1
Vulnerability: Out-of-bounds Read
Severity: Critical
Date: Mar 12, 2025
What Undercode Say:
Exploitation:
1. Exploit Code Example:
require 'json'
malicious_json = '{"key": "' + 'A' 10000 + '"}'
JSON.parse(malicious_json) Triggers out-of-bounds read
2. Payload Creation:
- Craft a JSON payload with oversized strings or deeply nested structures to trigger the vulnerability.
3. Exploit Impact:
- Causes application crashes or memory leaks, potentially exposing sensitive data.
Protection:
1. Update Ruby JSON Gem:
gem update json --version 2.10.2
2. Input Validation:
- Validate JSON input size and structure before parsing.
def safe_json_parse(input) raise "Input too large" if input.size > 10000 JSON.parse(input) end
3. Monitoring:
- Use monitoring tools to detect abnormal memory usage or crashes in production environments.
4. Patch Deployment:
- Ensure all systems using Ruby JSON gem are updated to version 2.10.2 or later.
5. Testing:
- Test applications with fuzzing tools to identify potential vulnerabilities in JSON parsing.
6. Logging:
- Implement detailed logging to capture and analyze JSON parsing errors.
begin JSON.parse(input) rescue => e logger.error("JSON parsing error: {e.message}") end
7. Network Security:
- Use firewalls and intrusion detection systems to block malicious payloads targeting JSON endpoints.
8. Code Review:
- Conduct thorough code reviews to identify and fix unsafe parsing practices.
9. Sandboxing:
- Run JSON parsing in isolated environments to limit the impact of potential exploits.
10. Community Alerts:
- Subscribe to Ruby security mailing lists for timely updates on vulnerabilities and patches.
By following these steps, developers and system administrators can mitigate the risks associated with CVE-2025-1234 and ensure the security of their Ruby applications.
References:
Reported By: https://github.com/advisories/GHSA-9m3q-rhmv-5q44
Extra Source Hub:
Undercode
