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Debian LTS Advisory DLA-2686-1                debian-lts@lists.debian.org
https://www.debian.org/lts/security/                          Abhijith PA
June 15, 2021                                 https://wiki.debian.org/LTS
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Package        : python-urllib3
Version        : 1.19.1-1+deb9u1
CVE ID         : CVE-2018-20060 CVE-2019-11236 CVE-2019-11324 CVE-2020-26137

Several vulnerabilities were discovered in python-urllib3, a HTTP 
client for Python. 

CVE-2018-20060

    Urllib3 does not remove the Authorization HTTP header when 
    following a cross-origin redirect (i.e., a redirect that differs 
    in host, port, or scheme). This can allow for credentials in the 
    Authorization header to be exposed to unintended hosts or 
    transmitted in cleartext.

CVE-2019-11236

    CRLF injection is possible if the attacker controls the request 
    parameter.

CVE-2019-11324

    Urllib3 mishandles certain cases where the desired set of CA 
    certificates is different from the OS store of CA certificates, 
    which results in SSL connections succeeding in situations where a 
    verification failure is the correct outcome. This is related to 
    use of the ssl_context, ca_certs, or ca_certs_dir argument.

CVE-2020-26137

    Urllib3 allows CRLF injection if the attacker controls the HTTP 
    request method, as demonstrated by inserting CR and LF control 
    characters in the first argument of putrequest().

For Debian 9 stretch, these problems have been fixed in version
1.19.1-1+deb9u1.

We recommend that you upgrade your python-urllib3 packages.

For the detailed security status of python-urllib3 please refer to
its security tracker page at:
https://security-tracker.debian.org/tracker/source-package/python-urllib3

Further information about Debian LTS security advisories, how to apply
these updates to your system and frequently asked questions can be
found at: https://wiki.debian.org/LTS