USN-5200-1: Python vulnerabilities
17 December 2021
Python could be made to crash if it receives specially crafted input from a malicious server.
Releases
Packages
- python3.7 - An interactive high-level object-oriented language
- python3.8 - An interactive high-level object-oriented language
Details
It was discovered that the urllib.request.AbstractBasicAuthHandler class
in Python contains regex allowing for catastrophic backtracking. Specially
crafted traffic from a malicious HTTP server could cause a regular expression
denial of service (ReDoS) condition for a client.
(CVE-2020-8492)
It was discovered that the urllib.request.AbstractBasicAuthHandler class
in Python contains regex with a quadratic worst-case time complexity.
Specially crafted traffic from a malicious HTTP server could cause a regular
expression denial of service (ReDoS) condition for a client.
(CVE-2021-3733)
It was discovered that the Python urllib http client could enter into an infinite
loop when incorrectly handling certain server responses (100 Continue response).
Specially crafted traffic from a malicious HTTP server could cause a denial of
service (DoS) condition for a client.
(CVE-2021-3737)
Update instructions
The problem can be corrected by updating your system to the following package versions:
Ubuntu 18.04
-
python3.7-minimal
-
3.7.5-2ubuntu1~18.04.2
-
libpython3.8-stdlib
-
3.8.0-3ubuntu1~18.04.2
-
libpython3.7-stdlib
-
3.7.5-2ubuntu1~18.04.2
-
python3.7
-
3.7.5-2ubuntu1~18.04.2
-
python3.8
-
3.8.0-3ubuntu1~18.04.2
-
python3.8-minimal
-
3.8.0-3ubuntu1~18.04.2
In general, a standard system update will make all the necessary changes.
References
Related notices
- USN-5083-1: libpython3.5-testsuite, python3.5-dev, python3.5-doc, python3.4-minimal, libpython3.4-stdlib, python3.5-venv, libpython3.4-dev, python3.4-dev, idle-python3.4, libpython3.5, python3.4-examples, idle-python3.5, python3.4, python3.5, libpython3.5-dev, python3.5-examples, libpython3.4-minimal, python3.4-venv, libpython3.4, python3.5-minimal, libpython3.5-minimal, python3.4-doc, libpython3.4-testsuite, libpython3.5-stdlib
- USN-5199-1: python3.6-doc, idle-python3.6, python3.6-dev, python3.6, python3.6-venv, libpython3.6-stdlib, python3.6-minimal, libpython3.6-dev, libpython3.6, libpython3.6-minimal, libpython3.6-testsuite, python3.6-examples
- USN-5201-1: python3.9-full, libpython3.9-testsuite, python3.8-examples, python3.9-doc, idle-python3.9, python3.8-doc, libpython3.9, libpython3.9-minimal, python3.8-dev, libpython3.8-minimal, python3.9-minimal, libpython3.9-stdlib, libpython3.8, libpython3.8-testsuite, libpython3.8-stdlib, python3.8-venv, python3.9, python3.8-minimal, idle-python3.8, python3.8, python3.9-dev, libpython3.9-dev, libpython3.8-dev, python3.9-examples, python3.9-venv, python3.8-full
- USN-6891-1: python3.11, python3.10-venv, python3.8-examples, python3.10-minimal, python3.6, libpython3.10, python3.5-doc, libpython3.12, python3.11-doc, idle-python3.10, idle-python3.9, libpython3.11-testsuite, idle-python3.6, python3.6-dev, libpython3.8-minimal, python3.7-venv, python3.9-minimal, libpython3.12-testsuite, idle-python3.7, python3.12-venv, python3.10-nopie, python3.12-examples, python3.9, python3.7, python3.5-minimal, libpython3.5-minimal, python3.11-full, libpython3.9-dev, python3.9-examples, libpython3.12-stdlib, libpython3.9-testsuite, python3.11-examples, libpython3.5-testsuite, python3.12-full, python3.8-doc, python3.10-examples, python3.8-dev, libpython3.7-testsuite, python3.7-examples, libpython3.11-dev, libpython3.9-stdlib, libpython3.6-minimal, python3.7-doc, libpython3.8, libpython3.8-stdlib, python3.10-full, libpython3.12-minimal, libpython3.5-dev, python3.5-examples, idle-python3.11, libpython3.10-stdlib, python3.6-examples, idle-python3.8, python3.12-nopie, libpython3.8-dev, python3.9-venv, python3.9-doc, python3.7-minimal, libpython3.9, libpython3.9-minimal, python3.12-doc, libpython3.5, python3.12-minimal, python3.7-dev, idle-python3.5, python3.11-venv, python3.11-nopie, python3.6-doc, python3.5, libpython3.11-stdlib, python3.6-venv, python3.8-venv, libpython3.7-stdlib, python3.11-dev, python3.11-minimal, libpython3.10-dev, python3.9-dev, libpython3.11, libpython3.11-minimal, libpython3.7-dev, python3.10-dev, python3.8-full, python3.9-full, libpython3.7-minimal, python3.5-dev, libpython3.7, libpython3.6, python3.5-venv, python3.10, libpython3.10-testsuite, python3.10-doc, libpython3.8-testsuite, python3.12-dev, libpython3.6-dev, idle-python3.12, libpython3.10-minimal, libpython3.6-testsuite, python3.8-minimal, python3.8, libpython3.6-stdlib, python3.6-minimal, libpython3.5-stdlib, libpython3.12-dev, python3.12
- USN-4333-1: python2.7-doc, libpython2.7, libpython3.7-minimal, python3.6, python3.7-minimal, libpython3.5-testsuite, python2.7, python2.7-minimal, python3.4-minimal, python3.5-dev, idle-python2.7, python3.5-doc, libpython3.7, libpython3.4-stdlib, libpython3.6, libpython2.7-minimal, python3.5-venv, libpython2.7-stdlib, libpython3.7-testsuite, idle-python3.6, python3.6-dev, libpython3.4-dev, python3.4-dev, python3.7-examples, idle-python3.4, libpython3.5, python3.4-examples, python3.7-dev, python3.7-venv, idle-python3.5, libpython3.6-minimal, python3.7-doc, idle-python3.7, python2.7-dev, python3.4, python3.6-doc, python3.5, python3.6-venv, libpython3.7-stdlib, libpython2.7-testsuite, python2.7-examples, libpython3.5-dev, python3.5-examples, libpython3.6-dev, libpython3.4-minimal, libpython3.6-testsuite, python3.6-examples, python3.7, python3.4-venv, libpython3.4, python3.5-minimal, libpython3.5-minimal, python3.4-doc, libpython3.6-stdlib, libpython2.7-dev, python3.6-minimal, libpython3.4-testsuite, libpython3.5-stdlib, libpython3.7-dev
- USN-4333-2: python3.8-dev, python3.8-examples, python3.8-venv, idle-python3.8, python3.8, libpython3.8-dev, libpython3.8-minimal, libpython3.8-testsuite, python3.8-doc, python3.8-minimal, libpython3.8, libpython3.8-stdlib
- USN-4754-3: python2.7-doc, libpython2.7, libpython3.7-minimal, python3.8-examples, python3.7-minimal, python2.7, python2.7-minimal, idle-python2.7, libpython3.7, libpython2.7-minimal, libpython2.7-stdlib, python3.8-dev, libpython3.7-testsuite, python3.7-examples, libpython3.8-minimal, python3.7-dev, python3.7-venv, python3.7-doc, idle-python3.7, libpython3.8, libpython3.8-testsuite, libpython3.8-stdlib, python2.7-dev, python3.8-venv, libpython3.7-stdlib, libpython2.7-testsuite, python2.7-examples, python3.8-minimal, python3.7, idle-python3.8, python3.8, libpython2.7-dev, libpython3.8-dev, libpython3.7-dev