CVE-2021-23336 Details

CVE-2021-23336

Published: 2021-02-15
Last Modified: 2021-05-04
CVE Author: NIST National Vulnerability Database
CVE Assigner: report@snyk.io
Summary

The package python/cpython from 0 and before 3.6.13, from 3.7.0 and before 3.7.10, from 3.8.0 and before 3.8.8, from 3.9.0 and before 3.9.2 are vulnerable to Web Cache Poisoning via urllib.parse.parse_qsl and urllib.parse.parse_qs by using a vector called parameter cloaking. When the attacker can separate query parameters using a semicolon (;), they can cause a difference in the interpretation of the request between the proxy (running with default configuration) and the server. This can result in malicious requests being cached as completely safe ones, as the proxy would usually not see the semicolon as a separator, and therefore would not include it in a cache key of an unkeyed parameter.

Analysis
Common Vulnerability Score System v2.0
Severity Medium
Base Score 4/10
Exploit Score 4.9/10
Access Vector Network
Access Complexity High
Authentication None
Impact Score 4.9/10
Confidentiality Impact None
Availability Impact Partial
Integrity Impact Partial
Vector String AV:N/AC:H/Au:N/C:N/I:P/A:P
Common Vulnerability Score System v3.1
Severity Medium
Base Score 5.9/10
Exploit Score 1.6/10
Access Vector Network
Access Complexity High
Privileges Required None
Impact Score 4.2/10
Confidentiality Impact None
Availability Impact High
Integrity Impact Low
Scope Unchanged
User Interaction Required
Vector String CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:H
Products Reported
CPE Vulnerable Start Excluding
cpe:2.3:a:python:python:*:*:*:*:*:*:*:* Yes - 3.6.13
cpe:2.3:a:python:python:*:*:*:*:*:*:*:* Yes 3.7.0 3.7.10
cpe:2.3:a:python:python:*:*:*:*:*:*:*:* Yes 3.8.0 3.8.8
cpe:2.3:a:python:python:*:*:*:*:*:*:*:* Yes 3.9.0 3.9.2
cpe:2.3:o:fedoraproject:fedora:32:*:*:*:*:*:*:* Yes - -
cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:* Yes - -
cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:* Yes - -
cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:* Yes - -
cpe:2.3:a:netapp:inventory_collect_tool:-:*:*:*:*:*:*:* Yes - -
cpe:2.3:a:netapp:ontap_select_deploy_administration_utility: Yes - -
cpe:2.3:a:netapp:snapcenter:-:*:*:*:*:*:*:* Yes - -
cpe:2.3:a:djangoproject:django:*:*:*:*:*:*:*:* Yes 2.2 2.2.19
cpe:2.3:a:djangoproject:django:*:*:*:*:*:*:*:* Yes 3.0 3.0.13
cpe:2.3:a:djangoproject:django:*:*:*:*:*:*:*:* Yes 3.1 3.1.7
References

https://snyk.io/vuln/SNYK-UPSTREAM-PYTHONCPYTHON-1074933
https://github.com/python/cpython/pull/24297
https://snyk.io/blog/cache-poisoning-in-popular-open-source-packages/
http://www.openwall.com/lists/oss-security/2021/02/19/4
https://lists.debian.org/debian-lts-announce/2021/02/msg00030.html
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/m
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/m
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/m
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/m
https://lists.apache.org/thread.html/rf9fa47ab66495c78bb4120b0754dd9531ca2ff0430f6685ac9
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/m
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/m
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/m
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/m
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/m
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/m
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/m
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/m
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/m
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/m
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/m
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/m
https://security.netapp.com/advisory/ntap-20210326-0004/
https://lists.debian.org/debian-lts-announce/2021/04/msg00005.html
https://lists.debian.org/debian-lts-announce/2021/04/msg00015.html
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/m
https://security.gentoo.org/glsa/202104-04
https://lists.apache.org/thread.html/ra8ce70088ba291f358e077cafdb14d174b7a1ce9a9d86d1b33
http://www.openwall.com/lists/oss-security/2021/05/01/2
https://lists.apache.org/thread.html/rc005f4de9d9b0ba943ceb8ff5a21a5c6ff8a9df52632476698

CVE ID
CVE-2021-23336
Published
2021-02-15
Modified
2021-05-04
CVSSv2.0
Medium
CVSSv3.1
Medium
PCI Compliance
Fail
US-CERT Alert
No
CWE
CWE-444

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