Python ipaddress Library Leading Zero IP Bypass
Severe, but no confirmed exploitation yet. Schedule remediation in your next patch cycle and apply mitigations if you're exposed.
An unauthenticated attacker, remotely over the network, with no user interaction, can fully compromise the system — steal data, tamper with it and take it offline.
In Python before 3,9,5, the ipaddress library mishandles leading zero characters in the octets of an IP address string. This (in some situations) allows attackers to bypass access control that is based on IP addresses.
Inferred from the weakness type (CWE) and how the flaw is reached — the techniques an attacker would chain to exploit this. Real-world corroboration appears here as threat intel is folded in.
Generated by Wavense from the CVE record — an immediate mitigation and the permanent fix.
Implement additional strict server-side input validation on IP address strings beyond the `ipaddress` library, explicitly rejecting leading zeros in octets where IP-based access control is critical. Deploy Web Application Firewalls (WAFs) or network access control lists (ACLs) that can parse and filter IP addresses to prevent malformed strings from reaching vulnerable applications. Enhance monitoring for unusual or failed access attempts from suspicious IP address patterns.
Upgrade Python to version 3.9.5 or a later stable release that includes the fix for this vulnerability. Ensure all applications and services that utilize the `ipaddress` library for IP-based access control are running on a patched Python environment. Review application code to confirm the `ipaddress` library is correctly used and updated versions address the mishandling of leading zero characters.
An attacker can craft IP address strings with leading zeros to bypass IP-based access controls implemented using the vulnerable `ipaddress` library. This could grant unauthorized access to restricted network resources, sensitive data, or critical services, potentially leading to data breaches, system compromise, or service disruption depending on the controlled resource.
No CWE classification has been assigned.
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