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CVE-2018-20852 Details

Description

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.

Metrics

CVSS 3.x Severity and Vector Strings:

NIST: [email protected]CVSS-B:5.3 MEDIUMVector:CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

References to Advisories, Solutions, and Tools

By selecting these links, you will be leaving this site. These are references gathered from the official CVE record and are not endorsed by Volerion.

URL	Source(s)	Tag(s)
http://lists.opensuse.org/opensuse-security-announce/2019-08/msg00071.html	CVE
http://lists.opensuse.org/opensuse-security-announce/2019-08/msg00074.html	CVE
http://lists.opensuse.org/opensuse-security-announce/2020-01/msg00040.html	CVE
https://access.redhat.com/errata/RHSA-2019:3725	CVE
https://access.redhat.com/errata/RHSA-2019:3948	CVE
https://bugs.python.org/issue35121	CVE	ExploitIssue TrackingVendor Advisory
https://lists.debian.org/debian-lts-announce/2019/08/msg00022.html	CVE
https://lists.debian.org/debian-lts-announce/2019/08/msg00040.html	CVE
https://lists.debian.org/debian-lts-announce/2020/07/msg00011.html	CVE
https://lists.debian.org/debian-lts-announce/2020/08/msg00034.html	CVE
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/COATURTCY7G67AYI6UDV5B2JZTBCKIDX/	CVE
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/K7HNVIFMETMFWWWUNTB72KYJYXCZOS5V/	CVE
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZBTGPBUABGXZ7WH7677OEM3NSP6ZEA76/	CVE
https://python-security.readthedocs.io/vuln/cookie-domain-check.html	CVE	Vendor Advisory
https://security.gentoo.org/glsa/202003-26	CVE
https://usn.ubuntu.com/4127-1/	CVE
https://usn.ubuntu.com/4127-2/	CVE
https://www.oracle.com/security-alerts/cpuapr2020.html	CVE
http://lists.opensuse.org/opensuse-security-announce/2019-08/msg00071.html	[email protected]
http://lists.opensuse.org/opensuse-security-announce/2019-08/msg00074.html	[email protected]
http://lists.opensuse.org/opensuse-security-announce/2020-01/msg00040.html	[email protected]
https://access.redhat.com/errata/RHSA-2019:3725	[email protected]
https://access.redhat.com/errata/RHSA-2019:3948	[email protected]
https://bugs.python.org/issue35121	[email protected]	ExploitIssue TrackingVendor Advisory
https://lists.debian.org/debian-lts-announce/2019/08/msg00022.html	[email protected]
https://lists.debian.org/debian-lts-announce/2019/08/msg00040.html	[email protected]
https://lists.debian.org/debian-lts-announce/2020/07/msg00011.html	[email protected]
https://lists.debian.org/debian-lts-announce/2020/08/msg00034.html	[email protected]
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/COATURTCY7G67AYI6UDV5B2JZTBCKIDX/	[email protected]
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/K7HNVIFMETMFWWWUNTB72KYJYXCZOS5V/	[email protected]
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZBTGPBUABGXZ7WH7677OEM3NSP6ZEA76/	[email protected]
https://python-security.readthedocs.io/vuln/cookie-domain-check.html	[email protected]	Vendor Advisory
https://security.gentoo.org/glsa/202003-26	[email protected]
https://usn.ubuntu.com/4127-1/	[email protected]
https://usn.ubuntu.com/4127-2/	[email protected]
https://www.oracle.com/security-alerts/cpuapr2020.html	[email protected]

see all 36 references

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-20	Improper Input Validation	[email protected]

Affected Products

Product	Versions
python python	>= 2.0, <= 2.7.16 >= 3.0.0, < 3.4.10 >= 3.5.0, < 3.5.7 >= 3.6.0, < 3.6.9 >= 3.7.0, < 3.7.3
CPE cpe:2.3:a:python:python:::::::: Remediation No remediation found in references.

Change History

21 change records found show changes

Date	Action	Recorded By
Jun 17, 2026	CVE Modified	[email protected]
Nov 21, 2024	CVE Modified	CVE
May 14, 2024	CVE Modified	[email protected]
Nov 7, 2023	CVE Modified	[email protected]
Aug 22, 2020	CVE Modified	[email protected]
Jul 15, 2020	CVE Modified	[email protected]
Apr 15, 2020	CVE Modified	[email protected]
Mar 15, 2020	CVE Modified	[email protected]
Jan 21, 2020	CVE Modified	[email protected]
Nov 25, 2019	CVE Modified	[email protected]
Nov 10, 2019	CVE Modified	[email protected]
Nov 10, 2019	CVE Modified	[email protected]
Nov 9, 2019	CVE Modified	[email protected]
Nov 6, 2019	CVE Modified	[email protected]
Sep 18, 2019	CVE Modified	[email protected]
Sep 10, 2019	CVE Modified	[email protected]
Sep 1, 2019	CVE Modified	[email protected]
Aug 23, 2019	CVE Modified	[email protected]
Aug 23, 2019	CVE Modified	[email protected]
Aug 17, 2019	CVE Modified	[email protected]
Jul 18, 2019	Initial Analysis	[email protected]