CVE-2021-3733

Source

https://nvd.nist.gov/vuln/detail/CVE-2021-3733

Import Source

https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-3733.json

Aliases

• BIT-python-2021-3733
• PSF-2022-6

Related

• ALSA-2021:4160
• ALSA-2022:1764
• ALSA-2022:1821
• DLA-2808-1
• DLA-3432-1
• DLA-3477-1
• RLSA-2021:4160
• RLSA-2022:1764
• RLSA-2022:1821
• USN-5083-1
• USN-5199-1
• USN-5200-1

Published

2022-03-10T17:42:59Z

Modified

2023-12-06T01:01:21.058749Z

Details

There's a flaw in urllib's AbstractBasicAuthHandler class. An attacker who controls a malicious HTTP server that an HTTP client (such as web browser) connects to, could trigger a Regular Expression Denial of Service (ReDOS) during an authentication request with a specially crafted payload that is sent by the server to the client. The greatest threat that this flaw poses is to application availability.

References

• https://bugs.python.org/issue43075
• https://security.netapp.com/advisory/ntap-20220407-0001/
• https://github.com/python/cpython/commit/7215d1ae25525c92b026166f9d5cac85fb
• https://github.com/python/cpython/pull/24391
• https://ubuntu.com/security/CVE-2021-3733
• https://bugzilla.redhat.com/show_bug.cgi?id=1995234
• https://lists.debian.org/debian-lts-announce/2023/05/msg00024.html
• https://lists.debian.org/debian-lts-announce/2023/06/msg00039.html