CVEvulnerability

CVE-2018-20852

4.3 MEDIUM Published 2019-07-13 Modified 2026-10-07 Official page ↗
Status
Modified
Published
2019-07-13
Last modified
2026-10-07
Assigner
[email protected]
CVSS 3.1 (134c704f-9b21-4f2e-91b3-4a467353bcc0)
4.3 MEDIUM — CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N
CVSS 3.0 ([email protected])
5.3 MEDIUM — CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
CVSS 2.0 ([email protected])
5.0 MEDIUM — AV:N/AC:L/Au:N/C:P/I:N/A:N
Weaknesses
CWE-20

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 configurations

• python python (>= 2.0 <= 2.7.16) • python python (>= 3.0.0 < 3.4.10) • python python (>= 3.5.0 < 3.5.7) • python python (>= 3.6.0 < 3.6.9) • python python (>= 3.7.0 < 3.7.3)

Related

Weakness · CWE (1)

  • CWE-20 Improper Input Validation weakness

References