CVE-2018-20852

Advisory lineage Upstream: 0 Downstream: 30
Modified
Published: 13 Jul 2019, 20:29
Last modified:05 Aug 2024, 12:12

Vulnerability Summary

Overall Risk (default)
medium
32/100
CVSS Score
5.3 MEDIUM
v3.0 (nvd)
EPSS Score
1.67% LOW
2% probability -0.03%
KEV
Not listed
Ransomware
No reports
Public exploits
1 found
Dark Web
Not detected

Timeline

13 Jul 2019, 20:29
Published
Vulnerability first disclosed
05 Aug 2024, 12:12
Last Modified
Vulnerability information updated

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.

CVSS Metrics

  • v3.0•MEDIUM•Score: 5.3CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
  • v2.0•MEDIUM•Score: 5AV:N/AC:L/Au:N/C:P/I:N/A:N

EPSS Trends

Current EPSS score: 1.67%• Percentile: 82%

Techniques & Countermeasures

  • CWE-20•Improper Input Validation

    The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.

Affected Systems

  • 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

References (18)