CVE-2021-21240

Advisory

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 "\xa0" 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. See CVE-2021-21240.

Affected package

Affected versions

Fixed versions

Vulnerability changelog

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 "\xa0" 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. See CVE-2021-21240.


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

Resources

• https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-21240
• 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