[ASA-202102-35] python-httplib2: denial of service
foxboron at archlinux.org
Mon Mar 1 22:23:23 UTC 2021
Arch Linux Security Advisory ASA-202102-35
Date : 2021-02-27
CVE-ID : CVE-2021-21240
Package : python-httplib2
Type : denial of service
Remote : Yes
Link : https://security.archlinux.org/AVG-1546
The package python-httplib2 before version 0.19.0-1 is vulnerable to
denial of service.
Upgrade to 0.19.0-1.
# pacman -Syu "python-httplib2>=0.19.0-1"
The problem has been fixed upstream in version 0.19.0.
The issue can be mitigated by using
"httplib2.USE_WWW_AUTH_STRICT_PARSING = True".
In python-httplib2 before version 0.19.0, a malicious server which
responds with a 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.
A malicious server can crash the application with crafted HTTP
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