CVE-2021-29921 is a critical vulnerability that affects the ipaddress library in Python versions prior to 3.9.5. This vulnerability allows attackers to bypass access control mechanisms that rely on IP addresses by mishandling leading zero characters in the octets of an IP address string. The CVSS score for this vulnerability is 9.8, indicating a high level of severity that necessitates immediate attention from security teams.
Organizations using affected versions of Python are at significant risk, as this vulnerability can allow unauthorized access to systems and sensitive data. Given the ease of exploitation, it is crucial for organizations to prioritize patching these vulnerabilities to safeguard their infrastructure.
Currently, there are no known public exploits or active exploitation of this vulnerability. However, the potential impact on confidentiality, integrity, and availability is substantial, making it essential for organizations to take prompt action.
Organizations should prioritize patching immediately to mitigate risks associated with CVE-2021-29921. Regular vulnerability assessments and timely updates are crucial for maintaining security posture.
Vulnerability Details
The official description of CVE-2021-29921 states that it allows attackers to bypass access control mechanisms based on IP addresses due to mishandling of leading zero characters in the octets of an IP address string. The vulnerability affects all versions of Python prior to 3.9.5.
The CVSS score assigned to this vulnerability is 9.8, classified as critical. This high severity level indicates a significant risk to organizations leveraging the affected Python library.
The vulnerability affects the following products: Python, Oracle Communications Cloud Native Core Automated Test Suite, Oracle Communications Cloud Native Core Binding Support Function, Oracle Communications Cloud Native Core Network Slice Selection Function, Oracle GraalVM, and Oracle ZFS Storage Appliance Kit.
The vulnerability was published on May 6, 2021, and has been marked as modified in subsequent updates.
Technical Analysis
The root cause of the vulnerability lies in the ipaddress library's handling of leading zero characters in IP address strings. Specifically, the library improperly processes octets that contain leading zeros, which can lead to unauthorized access when IP address-based access controls are employed.
The attack vector is network-based, requiring no privileges or user interaction to exploit. The attack complexity is low, enabling attackers to exploit the vulnerability without significant effort.
The potential impact includes high confidentiality, integrity, and availability risks, as successful exploitation can lead to unauthorized access and compromise of sensitive data.
Risk & Impact Analysis
The risk to organizations includes unauthorized access to systems that utilize the affected versions of Python, potentially leading to data breaches or data loss. The blast radius is significant, especially for organizations that rely on IP address filtering for access control.
Given the CVSS score of 9.8, it is imperative for organizations to address this vulnerability in their patch management cycles. Organizations should schedule remediation as soon as possible to minimize potential risks.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
The vulnerable versions of Python are those prior to 3.9.5, specifically Python 3.8.0 through 3.8.12 and Python 3.9.0 through 3.9.5. If specific version information is missing, it is noted that all versions prior to the vendor patch are affected.
Mitigation & Remediation
Organizations should apply patches or updates to remediate CVE-2021-29921. The latest version of Python that addresses this vulnerability is 3.9.5 and organizations should upgrade to this version or later.
In the absence of a patch, organizations should implement configuration hardening and network controls to mitigate the risk of exploitation. Monitoring for any unauthorized access attempts should also be prioritized.
For further insights on effective security practices, organizations may consider engaging in penetration testing to identify and address similar vulnerabilities.
Detection Guidance
Organizations should monitor system logs for any unusual access patterns or attempts to exploit this vulnerability. Behavioral anomalies associated with IP address validation failures should be flagged for review.
Setting up network signatures to detect leading zero patterns in IP addresses can aid in identifying potential exploitation attempts.
AppSecure Threat Intelligence Insight
CVE-2021-29921 highlights the importance of rigorous input validation in application security. The mishandling of leading zero characters in IP addresses serves as a reminder for organizations to adopt stringent coding practices.
Security teams should prioritize reviewing libraries and components that handle critical functions such as authentication and access control. For comprehensive security assessments, organizations can refer to our API penetration testing guide and consider implementing cloud penetration testing methodologies to enhance their security posture.
By continuously assessing and improving security measures, organizations can better protect against vulnerabilities like CVE-2021-29921.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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