// For flags

CVE-2021-23336

Web Cache Poisoning

Severity Score

5.9
*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

1
*Multiple Sources

Exploited in Wild

-
*KEV

Decision

-
*SSVC
Descriptions

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.

El paquete python/cpython desde versiones 0 y anteriores a 3.6.13, desde versiones 3.7.0 y anteriores a 3.7.10, desde versiones 3.8.0 y anteriores a 3.8.8, desde versiones 3.9.0 y anteriores a 3.9.2, son vulnerables al envenenamiento de caché web por medio de urllib.parse.parse_qsl y urllib.parse.parse_qs usando un vector llamado encubrimiento de parámetros. Cuando el atacante puede separar los parámetros de la consulta usando un punto y coma (;), pueden causar una diferencia en la interpretación de la petición entre el proxy (que se ejecuta con la configuración predeterminada) y el servidor. Esto puede resultar en que las peticiones maliciosas se almacenen en caché como completamente seguras, ya que el proxy normalmente no vería el punto y coma como un separador y, por lo tanto, no lo incluiría en una clave de caché de un parámetro sin clave

The package python/cpython is 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.

*Credits: Snyk Security Team
CVSS Scores
Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
None
Integrity
Low
Availability
High
Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
None
Integrity
Low
Availability
High
Attack Vector
Network
Attack Complexity
High
Authentication
None
Confidentiality
None
Integrity
Partial
Availability
Partial
* Common Vulnerability Scoring System
SSVC
  • Decision:-
Exploitation
-
Automatable
-
Tech. Impact
-
* Organization's Worst-case Scenario
Timeline
  • 2021-01-08 CVE Reserved
  • 2021-02-15 CVE Published
  • 2023-11-08 EPSS Updated
  • 2024-09-16 CVE Updated
  • 2024-09-16 First Exploit
  • ---------- Exploited in Wild
  • ---------- KEV Due Date
CWE
  • CWE-444: Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')
CAPEC
References (39)
URL Date SRC
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/3EPYWWFDV22CJ5AOH5VCE72DOASZZ255 2023-11-07
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/3YKKDLXL3UEZ3J426C2XTBS63AHE46SM 2023-11-07
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/46N6A52EGSXHJYCZWVMBJJIH4NWIV2B5 2023-11-07
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/FONHJIOZOFD7CD35KZL6SVBUTMBPGZGA 2023-11-07
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/HCQTCSP6SCVIYNIRUJC5X7YBVUHPLSC4 2023-11-07
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/HZTM7KLHFCE3LWSEVO2NAFLUHMGYMCRY 2023-11-07
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/IHQDU7NXA7EWAE4W7VO6MURVJIULEPPR 2023-11-07
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/KJXCMHLY7H3FIYLE4OKDYUILU2CCRUCZ 2023-11-07
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/LVNH6Z24IG3E67ZCQGGJ46FZB4XFLQNZ 2023-11-07
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/MNUN5SOMFL2BBKP6ZAICIIUPQKZDMGYO 2023-11-07
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/MP572OLHMS7MZO4KUPSCIMSZIA5IZZ62 2023-11-07
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/N6VXJZSZ6N64AILJX4CTMACYGQGHHD5C 2023-11-07
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/NJSCSN722JO2E2AGPWD4NTGVELVRPB4R 2023-11-07
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/NODWHDIFBQE5RU5PUWUVE47JOT5VCMJ2 2023-11-07
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/OAGSWNGZJ6HQ5ISA67SNMK3CJRKICET7 2023-11-07
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RSLQD5CCM75IZGAMBDGUZEATYU5YSGJ7 2023-11-07
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/SGIY6I4YS3WOXAK4SXKIEOC2G4VZKIR7 2023-11-07
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TFTELUMWZE3KV3JB2H5EE6VFRZFRD5MV 2023-11-07
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/W2LSKBEFI5SYEY5FM6ICZVZM5WRQUCS4 2023-11-07
https://security.gentoo.org/glsa/202104-04 2023-11-07
https://access.redhat.com/security/cve/CVE-2021-23336 2021-11-09
https://bugzilla.redhat.com/show_bug.cgi?id=1928904 2021-11-09
Affected Vendors, Products, and Versions
Vendor Product Version Other Status
Vendor Product Version Other Status <-- --> Vendor Product Version Other Status
Python
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Python
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< 3.6.13
Search vendor "Python" for product "Python" and version " < 3.6.13"
-
Affected
Python
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Python
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>= 3.7.0 < 3.7.10
Search vendor "Python" for product "Python" and version " >= 3.7.0 < 3.7.10"
-
Affected
Python
Search vendor "Python"
Python
Search vendor "Python" for product "Python"
>= 3.8.0 < 3.8.8
Search vendor "Python" for product "Python" and version " >= 3.8.0 < 3.8.8"
-
Affected
Python
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Python
Search vendor "Python" for product "Python"
>= 3.9.0 < 3.9.2
Search vendor "Python" for product "Python" and version " >= 3.9.0 < 3.9.2"
-
Affected
Fedoraproject
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Fedora
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32
Search vendor "Fedoraproject" for product "Fedora" and version "32"
-
Affected
Fedoraproject
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Fedora
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33
Search vendor "Fedoraproject" for product "Fedora" and version "33"
-
Affected
Fedoraproject
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Fedora
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34
Search vendor "Fedoraproject" for product "Fedora" and version "34"
-
Affected
Debian
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Debian Linux
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9.0
Search vendor "Debian" for product "Debian Linux" and version "9.0"
-
Affected
Netapp
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Cloud Backup
Search vendor "Netapp" for product "Cloud Backup"
--
Affected
Netapp
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Inventory Collect Tool
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--
Affected
Netapp
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Ontap Select Deploy Administration Utility
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--
Affected
Netapp
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Snapcenter
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--
Affected
Djangoproject
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Django
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>= 2.2 < 2.2.19
Search vendor "Djangoproject" for product "Django" and version " >= 2.2 < 2.2.19"
-
Affected
Djangoproject
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Django
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>= 3.0 < 3.0.13
Search vendor "Djangoproject" for product "Django" and version " >= 3.0 < 3.0.13"
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Affected
Djangoproject
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Django
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>= 3.1 < 3.1.7
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-
Affected
Oracle
Search vendor "Oracle"
Communications Offline Mediation Controller
Search vendor "Oracle" for product "Communications Offline Mediation Controller"
12.0.0.3.0
Search vendor "Oracle" for product "Communications Offline Mediation Controller" and version "12.0.0.3.0"
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Affected
Oracle
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Communications Pricing Design Center
Search vendor "Oracle" for product "Communications Pricing Design Center"
12.0.0.3.0
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-
Affected
Oracle
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Enterprise Manager Ops Center
Search vendor "Oracle" for product "Enterprise Manager Ops Center"
12.4.0.0
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-
Affected
Oracle
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Zfs Storage Appliance
Search vendor "Oracle" for product "Zfs Storage Appliance"
8.8
Search vendor "Oracle" for product "Zfs Storage Appliance" and version "8.8"
-
Affected