Web cache poisoning in Django



Published: 2021-02-19
Risk Medium
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2021-23336
CWE-ID CWE-20
Exploitation vector Network
Public exploit N/A
Vulnerable software
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Django
Web applications / CMS

Vendor Django Software Foundation

Security Bulletin

This security bulletin contains one medium risk vulnerability.

1) Input validation error

EUVDB-ID: #VU50814

Risk: Medium

CVSSv3.1:

CVE-ID: CVE-2021-23336

CWE-ID: CWE-20 - Improper Input Validation

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform web cache spoofing attack.

The vulnerability exists due to insufficient validation of user-supplied input in django.utils.http.limited_parse_qsl() when parsing strings with a semicolon (";"). A remote attacker can pass specially crafted data to the application and perform a spoofing attack.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Django: 3.0 - 3.1.6, 2.2 - 2.2.18


CPE2.3 External links

http://github.com/python/cpython/pull/24297
http://snyk.io/blog/cache-poisoning-in-popular-open-source-packages/
http://snyk.io/vuln/SNYK-UPSTREAM-PYTHONCPYTHON-1074933
http://www.djangoproject.com/weblog/2021/feb/19/security-releases/

Q & A

Can this vulnerability be exploited remotely?

Is there known malware, which exploits this vulnerability?



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