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CVE-2018-20852

Published: 13 July 2019

http.cookiejar.DefaultPolicy.domain_return_ok in Lib/http/cookiejar.py in Python before 3.7.3 does not correctly validate the domain: it can be tricked into sending existing cookies to the wrong server. An attacker may abuse this flaw by using a server with a hostname that has another valid hostname as a suffix (e.g., pythonicexample.com to steal cookies for example.com). When a program uses http.cookiejar.DefaultPolicy and tries to do an HTTP connection to an attacker-controlled server, existing cookies can be leaked to the attacker. This affects 2.x through 2.7.16, 3.x before 3.4.10, 3.5.x before 3.5.7, 3.6.x before 3.6.9, and 3.7.x before 3.7.3.

Priority

Medium

Cvss 3 Severity Score

5.3

Score breakdown

Status

Package Release Status
python2.7
Launchpad, Ubuntu, Debian
bionic
Released (2.7.15-4ubuntu4~18.04.1)
cosmic Ignored
(end of life)
disco
Released (2.7.16-2ubuntu0.1)
eoan Not vulnerable
(2.7.16-3)
focal Not vulnerable
(2.7.16-3)
groovy Not vulnerable
(2.7.16-3)
hirsute Not vulnerable
(2.7.16-3)
impish Not vulnerable
(2.7.16-3)
jammy Not vulnerable
(2.7.16-3)
kinetic Not vulnerable
(2.7.16-3)
lunar Does not exist

mantic Does not exist

noble Does not exist

trusty
Released (2.7.6-8ubuntu0.6+esm2)
Available with Ubuntu Pro or Ubuntu Pro (Infra-only)
upstream
Released (2.7.16-3)
xenial
Released (2.7.12-1ubuntu0~16.04.8)
Patches:
upstream: https://github.com/python/cpython/commit/979daae300916adb399ab5b51410b6ebd0888f13




python3.4
Launchpad, Ubuntu, Debian
bionic Does not exist

cosmic Does not exist

disco 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

mantic Does not exist

noble Does not exist

trusty
Released (3.4.3-1ubuntu1~14.04.7+esm2)
Available with Ubuntu Pro or Ubuntu Pro (Infra-only)
upstream
Released (3.4.10)
xenial Does not exist

Patches:

upstream: https://github.com/python/cpython/commit/42ad4101d3ba7ca3c371dadf0f8880764c9f15fb



python3.5
Launchpad, Ubuntu, Debian
bionic Does not exist

cosmic Does not exist

disco 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

mantic Does not exist

noble Does not exist

trusty Needed

upstream
Released (3.5.7)
xenial
Released (3.5.2-2ubuntu0~16.04.8)
Patches:


upstream: https://github.com/python/cpython/commit/4749f1b69000259e23b4cc6f63c542a9bdc62f1b


python3.6
Launchpad, Ubuntu, Debian
bionic
Released (3.6.8-1~18.04.2)
cosmic Ignored
(end of life)
disco 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

mantic Does not exist

noble Does not exist

trusty Does not exist

upstream
Released (3.6.9)
xenial Does not exist

Patches:



upstream: https://github.com/python/cpython/commit/b241af861b37e20ad30533bc0b7e2e5491cc470f

python3.7
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(3.7.3-2)
cosmic Not vulnerable
(3.7.3-2)
disco Not vulnerable
(3.7.3-2)
eoan Not vulnerable
(3.7.3-2)
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

mantic Does not exist

noble Does not exist

trusty Does not exist

upstream
Released (3.7.3~rc1-1)
xenial Does not exist

Patches:




upstream: https://github.com/python/cpython/commit/e5123d81ffb3be35a1b2767d6ced1a097aaf77be

Severity score breakdown

Parameter Value
Base score 5.3
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Scope Unchanged
Confidentiality Low
Integrity impact None
Availability impact None
Vector CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N