Private IPv6 Address Disclosure

Description

Private IPv6 addresses are reserved for use within private networks and are not routable on the public Internet. Disclosing private IPv6 addresses can provide attackers with insights into the internal network structure and topology. While this information may not directly impact the target, it can aid attackers in reconnaissance and help them better understand the target network’s infrastructure.

Recommendation

To mitigate the risk of disclosing private IPv6 addresses, ensure they are not unintentionally exposed in publicly accessible resources such as web pages, APIs, or error messages. Implement access controls and proper network segmentation to restrict unauthorized access to internal network information.

References

• Best Practices for Protecting Private IP Address Disclosure
• CWE-200
• OWASP 2021-A5
• RFC 1918: Address Allocation for Private Internets
• Understanding Private IP Addresses