CVE-2021-21240 Information

Description

httplib2 is a comprehensive HTTP client library for Python. In httplib2 before version 0.19.0 a malicious server which responds with long series of \ characters in the \www-authenticate\ header may cause Denial of Service (CPU burn while parsing header) of the httplib2 client accessing said server. This is fixed in version 0.19.0 which contains a new implementation of auth headers parsing using the pyparsing library.

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Reference

https://github.com/httplib2/httplib2/commit/bd9ee252c8f099608019709e22c0d705e98d26bc https://github.com/httplib2/httplib2/pull/182 https://github.com/httplib2/httplib2/security/advisories/GHSA-93xj-8mrv-444m https://pypi.org/project/httplib2

Attack Complexity

LOW

Privileges Required

NONE

User Interaction Required

NONE

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

NONE

Availability Impact

NONE

Base Score

HIGH

Base Severity

7.5