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CVE-2018-20852

5.3 · MEDIUM

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 se…

Published Jul 13, 2019CWE-20EPSS 3.67%

Overview

CVE-2018-20852 is a medium-severity vulnerability. It was published on July 13, 2019 and has a CVSS 3.0 base score of 5.3 (MEDIUM).

This vulnerability has a CVSS 3.0 base score of 5.3, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Reflists.opensuse.org/opensuse-security-announce/2019-08/msg00071.htmlReflists.opensuse.org/opensuse-security-announce/2019-08/msg00074.htmlReflists.opensuse.org/opensuse-security-announce/2020-01/msg00040.htmlRefaccess.redhat.com/errata/RHSA-2019:3725Refaccess.redhat.com/errata/RHSA-2019:3948Refbugs.python.org/issue35121Reflists.debian.org/debian-lts-announce/2019/08/msg00022.htmlReflists.debian.org/debian-lts-announce/2019/08/msg00040.htmlReflists.debian.org/debian-lts-announce/2020/07/msg00011.htmlReflists.debian.org/debian-lts-announce/2020/08/msg00034.html

How CyberStrike helps

Frequently asked questions

What is CVE-2018-20852?

CVE-2018-20852 is a medium-severity vulnerability. It was published on July 13, 2019 and has a CVSS 3.0 base score of 5.3 (MEDIUM).

How severe is CVE-2018-20852?

This vulnerability has a CVSS 3.0 base score of 5.3, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2018-20852?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2018-20852?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2018-20852 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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