Bug 2247097 (CVE-2023-46695) - CVE-2023-46695 python-django: Potential denial of service vulnerability in UsernameField on Windows
Summary: CVE-2023-46695 python-django: Potential denial of service vulnerability in Us...
Keywords:
Status: NEW
Alias: CVE-2023-46695
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 2249284 2249286 2249279 2249280 2249281 2249282 2249283 2249285 2249287 2249288
Blocks: 2247098
TreeView+ depends on / blocked
 
Reported: 2023-10-30 16:35 UTC by Guilherme de Almeida Suckevicz
Modified: 2023-11-16 05:20 UTC (History)
48 users (show)

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A vulnerability was discovered in the Django package, where NFKC normalization could take a significant time. This flaw allows a remote, unauthenticated attacker to cause a denial of service by submitting inputs with a large number of Unicode characters.
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Description Guilherme de Almeida Suckevicz 2023-10-30 16:35:45 UTC 
The NFKC normalization is slow on Windows. As a consequence, ``django.contrib.auth.forms.UsernameField`` was subject to a potential denial of service attack via certain inputs with a very large number of Unicode characters.

In order to avoid the vulnerability, invalid values longer than ``UsernameField.max_length`` are no longer normalized, since they cannot pass validation anyway.
Comment 3 Nick Tait 2023-11-11 22:06:48 UTC 
Created python-django tracking bugs for this issue:

Affects: openstack-rdo [bug 2249282]
Comment 6 Nick Tait 2023-11-11 22:08:51 UTC 
Created python-django tracking bugs for this issue:

Affects: epel-all [bug 2249286]
Affects: fedora-all [bug 2249288]


Created python-django16 tracking bugs for this issue:

Affects: epel-all [bug 2249284]


Created python-django3 tracking bugs for this issue:

Affects: epel-all [bug 2249285]
Affects: fedora-all [bug 2249287]
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