CVE-2021-29921

Advisory

Python 3.8.12, 3.9.5 and 3.10.0 include a fix for CVE-2021-29921: 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.
https://python-security.readthedocs.io/vuln/ipaddress-ipv4-leading-zeros.html

Affected package

Affected versions

Fixed versions

Vulnerability changelog

This vulnerability has no description

Resources

• https://bugs.python.org/issue36384
• https://docs.python.org/3/library/ipaddress.html
• https://github.com/python/cpython/blob/63298930fb531ba2bb4f23bc3b915dbf1e17e9e1/Misc/NEWS.d/3.8.0a4.
• https://github.com/python/cpython/pull/12577
• https://github.com/python/cpython/pull/25099
• https://github.com/sickcodes
• https://github.com/sickcodes/security/blob/master/advisories/SICK-2021-014.md
• https://python-security.readthedocs.io/vuln/ipaddress-ipv4-leading-zeros.html
• https://sick.codes/sick-2021-014
• https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-29921
• https://github.com/python/cpython/blob/63298930fb531ba2bb4f23bc3b915dbf1e17e9e1/Misc/NEWS.d/3.8.0a4.rst
• https://security.netapp.com/advisory/ntap-20210622-0003/
• https://www.oracle.com//security-alerts/cpujul2021.html
• https://www.oracle.com/security-alerts/cpuoct2021.html
• https://www.oracle.com/security-alerts/cpujan2022.html
• https://www.oracle.com/security-alerts/cpuapr2022.html
• https://www.oracle.com/security-alerts/cpujul2022.html