CVE-2021-29921

Published: 6 May 2021

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.

Notes

Author	Note
mdeslaur	introduced in v3.8.0a4 This issue was re-introduced in python3.8 in focal because of the SRU in LP: #1928057

Priority

Cvss 3 Severity Score

9.8

Score breakdown

Status

Package	Release	Status
python2.7 Launchpad, Ubuntu, Debian	impish	Not vulnerable (code not present)
	jammy	Not vulnerable (code not present)
	kinetic	Not vulnerable (code not present)
	lunar	Does not exist
	upstream	Needs triage
	bionic	Not vulnerable (code not present)
	focal	Not vulnerable (code not present)
	groovy	Not vulnerable (code not present)
	hirsute	Not vulnerable (code not present)
	trusty	Not vulnerable (code not present)
	xenial	Not vulnerable (code not present)
python3.10 Launchpad, Ubuntu, Debian	impish	Not vulnerable (3.10.0~b1-2)
	jammy	Not vulnerable (3.10.0~b1-2)
	kinetic	Not vulnerable (3.10.0~b1-2)
	lunar	Does not exist
	trusty	Does not exist
	xenial	Does not exist
	bionic	Does not exist
	focal	Does not exist
	groovy	Does not exist
	upstream	Needs triage
	hirsute	Released (3.10.0~b1-3~21.04)
	Patches: upstream: https://github.com/python/cpython/commit/60ce8f0be6354ad565393ab449d8de5d713f35bc (v3.10.0b1)
python3.4 Launchpad, Ubuntu, Debian	impish	Does not exist
	jammy	Does not exist
	kinetic	Does not exist
	lunar	Does not exist
	xenial	Does not exist
	bionic	Does not exist
	focal	Does not exist
	groovy	Does not exist
	hirsute	Does not exist
	upstream	Needs triage
	trusty	Not vulnerable
python3.5 Launchpad, Ubuntu, Debian	impish	Does not exist
	jammy	Does not exist
	kinetic	Does not exist
	lunar	Does not exist
	bionic	Does not exist
	focal	Does not exist
	groovy	Does not exist
	hirsute	Does not exist
	upstream	Needs triage
	trusty	Not vulnerable
	xenial	Not vulnerable
python3.6 Launchpad, Ubuntu, Debian	impish	Does not exist
	jammy	Does not exist
	kinetic	Does not exist
	lunar	Does not exist
	xenial	Does not exist
	trusty	Does not exist
	focal	Does not exist
	groovy	Does not exist
	hirsute	Does not exist
	upstream	Needs triage
	bionic	Not vulnerable (3.6.9-1~18.04ubuntu1.4)
python3.7 Launchpad, Ubuntu, Debian	focal	Does not exist
	groovy	Does not exist
	hirsute	Does not exist
	impish	Does not exist
	jammy	Does not exist
	kinetic	Does not exist
	lunar	Does not exist
	trusty	Does not exist
	upstream	Needs triage
	xenial	Does not exist
	bionic	Not vulnerable (3.7.5-2~18.04.4)
python3.8 Launchpad, Ubuntu, Debian	hirsute	Does not exist
	impish	Does not exist
	jammy	Does not exist
	kinetic	Does not exist
	lunar	Does not exist
	trusty	Does not exist
	upstream	Needs triage
	xenial	Does not exist
	bionic	Needed
	focal	Released (3.8.10-0ubuntu1~20.04.1)
	groovy	Released (3.8.6-1ubuntu0.3)
python3.9 Launchpad, Ubuntu, Debian	bionic	Does not exist
	impish	Released (3.9.5-2ubuntu1)
	jammy	Does not exist
	kinetic	Does not exist
	lunar	Does not exist
	trusty	Does not exist
	upstream	Needs triage
	xenial	Does not exist
	focal	Released (3.9.5-3~20.04.1)
	groovy	Released (3.9.5-3~20.10.1)
	hirsute	Released (3.9.5-3~21.04)
	Patches: upstream: https://github.com/python/cpython/commit/5374fbc31446364bf5f12e5ab88c5493c35eaf04 (v3.9.5)

Severity score breakdown

Parameter	Value
Base score	9.8
Attack vector	Network
Attack complexity	Low
Privileges required	None
User interaction	None
Scope	Unchanged
Confidentiality	High
Integrity impact	High
Availability impact	High
Vector	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

References

Bugs

https://bugs.python.org/issue36384

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