CVE-2018-20852
MEDIUM5.3EPSS 1.7%python2.7 - security update
Published: 7/13/2019Modified: 3/9/2026
Also known as:DEBIAN-CVE-2018-20852DLA-2337-1
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.
Affected packages (4)
- Debian/python2.7from 0, < 2.7.16-3
- Debian/python2.7from 0, < 2.7.9-2+deb8u4
- Debian/python2.7from 0, < 2.7.13-2+deb9u4
- Debian/python3.4from 0, < 3.4.2-1+deb8u6
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | MEDIUM5.3 | CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N |