medium
5.9
CWE
444
Advisory Published
CVE Published
Updated

CVE-2021-23336: Web Cache Poisoning

First published: Sat Feb 13 2021(Updated: )

Python CPython could allow a remote attacker to bypass security restrictions, caused by a web cache poisoning flaw via urllib.parse.parse_qsl and urllib.parse.parse_qs. By sending a specially-crafted request parameter cloaking, an attacker could exploit this vulnerability to cause a difference in the interpretation of the request between the proxy and the server.

Credit: report@snyk.io report@snyk.io

Affected SoftwareAffected VersionHow to fix
IBM Cloud Pak for Security (CP4S)<=1.7.2.0
IBM Cloud Pak for Security (CP4S)<=1.7.1.0
IBM Cloud Pak for Security (CP4S)<=1.7.0.0
Python Python<3.6.13
Python Python>=3.7.0<3.7.10
Python Python>=3.8.0<3.8.8
Python Python>=3.9.0<3.9.2
Fedoraproject Fedora=32
Fedoraproject Fedora=33
Fedoraproject Fedora=34
Debian Debian Linux=9.0
Netapp Cloud Backup
Netapp Inventory Collect Tool
NetApp ONTAP Select Deploy administration utility
Netapp Snapcenter
Djangoproject Django>=2.2<2.2.19
Djangoproject Django>=3.0<3.0.13
Djangoproject Django>=3.1<3.1.7
Oracle Communications Offline Mediation Controller=12.0.0.3.0
Oracle Communications Pricing Design Center=12.0.0.3.0
Oracle Enterprise Manager Ops Center=12.4.0.0
Oracle ZFS Storage Appliance=8.8
redhat/python3<0:3.6.8-37.el8
0:3.6.8-37.el8
redhat/python27-babel<0:0.9.6-10.el7
0:0.9.6-10.el7
redhat/python27-python<0:2.7.18-3.el7
0:2.7.18-3.el7
redhat/python27-python-jinja2<0:2.6-16.el7
0:2.6-16.el7
redhat/python27-python-pygments<0:1.5-5.el7
0:1.5-5.el7
redhat/rh-python38-babel<0:2.7.0-12.el7
0:2.7.0-12.el7
redhat/rh-python38-python<0:3.8.11-2.el7
0:3.8.11-2.el7
redhat/rh-python38-python-cryptography<0:2.8-5.el7
0:2.8-5.el7
redhat/rh-python38-python-jinja2<0:2.10.3-6.el7
0:2.10.3-6.el7
redhat/rh-python38-python-lxml<0:4.4.1-7.el7
0:4.4.1-7.el7
redhat/rh-python38-python-pip<0:19.3.1-2.el7
0:19.3.1-2.el7
redhat/rh-python38-python-urllib3<0:1.25.7-7.el7
0:1.25.7-7.el7

Remedy

http://www.openwall.com/lists/oss-security/2021/02/19/4

Remedy

https://github.com/python/cpython/pull/24297

Remedy

https://www.oracle.com//security-alerts/cpujul2021.html

Remedy

https://www.oracle.com/security-alerts/cpuApr2021.html

Remedy

https://www.oracle.com/security-alerts/cpujan2022.html

Remedy

https://www.oracle.com/security-alerts/cpuoct2021.html

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Reference Links

Parent vulnerabilities

(Appears in the following advisories)

Frequently Asked Questions

  • What is CVE-2021-23336?

    CVE-2021-23336 is a vulnerability in the Python CPython package that could allow a remote attacker to bypass security restrictions caused by a web cache poisoning.

  • How does CVE-2021-23336 work?

    CVE-2021-23336 allows an attacker to perform Web Cache Poisoning by using a vector called parameter cloaking, specifically targeting the functions urllib.parse.parse_qsl and urllib.parse.parse_qs.

  • What is the severity of CVE-2021-23336?

    CVE-2021-23336 has a severity level of medium with a score of 5.9.

  • Which versions of Python are affected by CVE-2021-23336?

    The versions of python/cpython affected by CVE-2021-23336 are 0 and before 3.6.13, 3.7.0 and before 3.7.10, 3.8.0 and before 3.8.8, and 3.9.0 and before 3.9.2.

  • How can I fix CVE-2021-23336?

    To fix CVE-2021-23336, update your Python package to version 3.6.13, 3.7.10, 3.8.8, or 3.9.2.

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