CVE-2018-20852

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CVE-2018-20852

Summary:

Details: 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.

References: http://lists.opensuse.org/opensuse-security-announce/2019-08/msg00071.html, http://lists.opensuse.org/opensuse-security-announce/2019-08/msg00074.html, http://lists.opensuse.org/opensuse-security-announce/2020-01/msg00040.html, https://lists.debian.org/debian-lts-announce/2019/08/msg00022.html, https://lists.debian.org/debian-lts-announce/2019/08/msg00040.html, https://lists.debian.org/debian-lts-announce/2020/07/msg00011.html, https://lists.debian.org/debian-lts-announce/2020/08/msg00034.html, https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/COATURTCY7G67AYI6UDV5B2JZTBCKIDX/, https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/K7HNVIFMETMFWWWUNTB72KYJYXCZOS5V/, https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZBTGPBUABGXZ7WH7677OEM3NSP6ZEA76/, https://usn.ubuntu.com/4127-1/, https://usn.ubuntu.com/4127-2/, https://www.oracle.com/security-alerts/cpuapr2020.html, https://access.redhat.com/errata/RHSA-2019:3725, https://access.redhat.com/errata/RHSA-2019:3948, https://python-security.readthedocs.io/vuln/cookie-domain-check.html, https://security.gentoo.org/glsa/202003-26, https://bugs.python.org/issue35121