Vulnerability CVE-2021-3733


Published: 2022-03-10

Description:
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.

Type:

CWE-400

(Uncontrolled Resource Consumption ('Resource Exhaustion'))

CVSS2 => (AV:N/AC:L/Au:S/C:N/I:N/A:P)

CVSS Base Score
Impact Subscore
Exploitability Subscore
4/10
2.9/10
8/10
Exploit range
Attack complexity
Authentication
Remote
Low
Single time
Confidentiality impact
Integrity impact
Availability impact
None
None
Partial
Affected software
Redhat -> Enterprise linux 
Python -> Python 

 References:
https://github.com/python/cpython/commit/7215d1ae25525c92b026166f9d5cac85fb
https://ubuntu.com/security/CVE-2021-3733
https://bugs.python.org/issue43075
https://bugzilla.redhat.com/show_bug.cgi?id=1995234
https://github.com/python/cpython/pull/24391

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