CVE-2020-8492

Published: 30 January 2020

Python 2.7 through 2.7.17, 3.5 through 3.5.9, 3.6 through 3.6.10, 3.7 through 3.7.6, and 3.8 through 3.8.1 allows an HTTP server to conduct Regular Expression Denial of Service (ReDoS) attacks against a client because of urllib.request.AbstractBasicAuthHandler catastrophic backtracking.

Priority

Cvss 3 Severity Score

6.5

Score breakdown

Status

Package	Release	Status
python2.7 Launchpad, Ubuntu, Debian	bionic	Released (2.7.17-1~18.04ubuntu1)
	eoan	Ignored (reached end-of-life)
	focal	Released (2.7.18-1~20.04.1)
	groovy	Ignored (reached end-of-life)
	hirsute	Ignored (reached end-of-life)
	impish	Ignored (reached end-of-life)
	jammy	Not vulnerable (2.7.18-13ubuntu1)
	kinetic	Not vulnerable (2.7.18-13ubuntu1)
	lunar	Does not exist
	trusty	Released (2.7.6-8ubuntu0.6+esm5)
	upstream	Needs triage
	xenial	Released (2.7.12-1ubuntu0~16.04.11)
python3.4 Launchpad, Ubuntu, Debian	bionic	Does not exist
	eoan	Does not exist
	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	Released (3.4.3-1ubuntu1~14.04.7+esm6)
	upstream	Needs triage
	xenial	Does not exist
python3.5 Launchpad, Ubuntu, Debian	bionic	Does not exist
	eoan	Does not exist
	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	Needed
	upstream	Needs triage
	xenial	Released (3.5.2-2ubuntu0~16.04.10)
python3.6 Launchpad, Ubuntu, Debian	bionic	Released (3.6.9-1~18.04ubuntu1)
	eoan	Does not exist
	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
	Patches: upstream: https://github.com/python/cpython/commit/69cdeeb93e0830004a495ed854022425b93b3f3e
python3.7 Launchpad, Ubuntu, Debian	bionic	Released (3.7.5-2ubuntu1~18.04.2)
	eoan	Released (3.7.5-2~19.10ubuntu1)
	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
	Patches: upstream: https://github.com/python/cpython/commit/b57a73694e26e8b2391731b5ee0b1be59437388e
python3.8 Launchpad, Ubuntu, Debian	bionic	Released (3.8.0-3ubuntu1~18.04.2)
	eoan	Ignored (reached end-of-life)
	focal	Released (3.8.2-1ubuntu1.1)
	groovy	Released (3.8.2-1ubuntu1.1)
	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
	Patches: upstream: https://github.com/python/cpython/commit/ea9e240aa02372440be8024acb110371f69c9d41

Severity score breakdown

Parameter	Value
Base score	6.5
Attack vector	Network
Attack complexity	Low
Privileges required	None
User interaction	Required
Scope	Unchanged
Confidentiality	None
Integrity impact	None
Availability impact	High
Vector	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

References

Bugs

https://bugs.python.org/issue39503

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