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Improper Input Validation Affecting python2.7 package, versions <2.7.13-2+deb9u4

Severity

 Recommended
0.0
medium
0
10

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Threat Intelligence

EPSS
1% (77th percentile)

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  • Snyk IDSNYK-DEBIAN9-PYTHON27-453437
  • published24 Jul 2019
  • disclosed13 Jul 2019
Report a new vulnerability Found a mistake?

Introduced: 13 Jul 2019

CVE-2018-20852  (opens in a new tab)
CWE-20  (opens in a new tab)

How to fix?

Upgrade Debian:9 python2.7 to version 2.7.13-2+deb9u4 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream python2.7 package and not the python2.7 package as distributed by Debian. See How to fix? for Debian:9 relevant fixed versions and status.

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