Vulnerability Monitor

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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.

Published

2021-05-06T13:15:12.573

Last Modified

2024-11-21T06:01:59.150

Status

Modified

Source

[email protected]

Severity

CVSSv3.1: 9.8 (CRITICAL)

CVSSv2 Vector

AV:N/AC:L/Au:N/C:P/I:P/A:P

Access Vector: NETWORK
Access Complexity: LOW
Authentication: NONE
Confidentiality Impact: PARTIAL
Integrity Impact: PARTIAL
Availability Impact: PARTIAL

Exploitability Score

10.0

Impact Score

6.4

Weaknesses

Type: Primary
NVD-CWE-Other

Affected Vendors & Products

Type	Vendor	Product	Version/Range	Vulnerable?
Application	python	python	< 3.8.12	Yes
Application	python	python	< 3.9.5	Yes
Application	oracle	communications_cloud_native_core_automated_test_suite	1.8.0	Yes
Application	oracle	communications_cloud_native_core_binding_support_function	1.11.0	Yes
Application	oracle	communications_cloud_native_core_network_slice_selection_function	1.8.0	Yes
Application	oracle	graalvm	20.3.2	Yes
Application	oracle	graalvm	21.1.0	Yes
Application	oracle	zfs_storage_appliance_kit	8.8	Yes

References

https://bugs.python.org/issue36384 Issue Tracking, Patch, Vendor Advisory ([email protected])
https://docs.python.org/3/library/ipaddress.html Vendor Advisory ([email protected])
https://github.com/python/cpython/blob/63298930fb531ba2bb4f23bc3b915dbf1e17e9e1/Misc/NEWS.d/3.8.0a4.rst Third Party Advisory ([email protected])
https://github.com/python/cpython/pull/12577 Patch, Third Party Advisory ([email protected])
https://github.com/python/cpython/pull/25099 Patch, Third Party Advisory ([email protected])
https://github.com/sickcodes Third Party Advisory ([email protected])
https://github.com/sickcodes/security/blob/master/advisories/SICK-2021-014.md Exploit, Third Party Advisory ([email protected])
https://python-security.readthedocs.io/vuln/ipaddress-ipv4-leading-zeros.html Vendor Advisory ([email protected])
https://security.gentoo.org/glsa/202305-02 ([email protected])
https://security.netapp.com/advisory/ntap-20210622-0003/ Third Party Advisory ([email protected])
https://sick.codes/sick-2021-014 Exploit, Third Party Advisory ([email protected])
https://www.oracle.com//security-alerts/cpujul2021.html Patch, Third Party Advisory ([email protected])
https://www.oracle.com/security-alerts/cpuapr2022.html Patch, Third Party Advisory ([email protected])
https://www.oracle.com/security-alerts/cpujan2022.html Patch, Third Party Advisory ([email protected])
https://www.oracle.com/security-alerts/cpujul2022.html ([email protected])
https://www.oracle.com/security-alerts/cpuoct2021.html Patch, Third Party Advisory ([email protected])
https://bugs.python.org/issue36384 Issue Tracking, Patch, Vendor Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://docs.python.org/3/library/ipaddress.html Vendor Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://github.com/python/cpython/blob/63298930fb531ba2bb4f23bc3b915dbf1e17e9e1/Misc/NEWS.d/3.8.0a4.rst Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://github.com/python/cpython/pull/12577 Patch, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://github.com/python/cpython/pull/25099 Patch, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://github.com/sickcodes Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://github.com/sickcodes/security/blob/master/advisories/SICK-2021-014.md Exploit, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://python-security.readthedocs.io/vuln/ipaddress-ipv4-leading-zeros.html Vendor Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://security.gentoo.org/glsa/202305-02 (af854a3a-2127-422b-91ae-364da2661108)
https://security.netapp.com/advisory/ntap-20210622-0003/ Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://sick.codes/sick-2021-014 Exploit, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://www.oracle.com//security-alerts/cpujul2021.html Patch, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://www.oracle.com/security-alerts/cpuapr2022.html Patch, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://www.oracle.com/security-alerts/cpujan2022.html Patch, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://www.oracle.com/security-alerts/cpujul2022.html (af854a3a-2127-422b-91ae-364da2661108)
https://www.oracle.com/security-alerts/cpuoct2021.html Patch, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)