USN-5199-1: Python vulnerabilities

Releases

• Ubuntu 18.04 ESM

Packages

• python3.6 - An interactive high-level object-oriented language

Details

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

• libpython3.6-stdlib - 3.6.9-1~18.04ubuntu1.6
• python3.6 - 3.6.9-1~18.04ubuntu1.6
• python3.6-minimal - 3.6.9-1~18.04ubuntu1.6

In general, a standard system update will make all the necessary changes.

References

• CVE-2021-3737
• CVE-2021-3733

Related notices

• USN-5083-1: libpython3.4-stdlib, idle-python3.4, libpython3.5, python3.5-examples, libpython3.5-dev, libpython3.4, libpython3.4-minimal, python3.4-venv, libpython3.5-minimal, python3.5-venv, python3.4-examples, python3.5-doc, python3.4, python3.4-minimal, python3.5-minimal, python3.5-dev, python3.4-dev, idle-python3.5, python3.5, libpython3.4-testsuite, python3.4-doc, libpython3.4-dev, libpython3.5-stdlib, libpython3.5-testsuite
• USN-5200-1: libpython3.7-testsuite, idle-python3.8, libpython3.8, idle-python3.7, libpython3.8-minimal, libpython3.8-testsuite, libpython3.7-minimal, python3.8-venv, libpython3.7-dev, python3.7-minimal, python3.8-dev, python3.7-doc, libpython3.8-dev, python3.8-examples, libpython3.8-stdlib, python3.7-examples, libpython3.7, python3.8, python3.7, libpython3.7-stdlib, python3.8-minimal, python3.7-dev, python3.7-venv
• USN-5201-1: idle-python3.8, python3.9-dev, libpython3.9, python3.8-doc, python3.9-venv, idle-python3.9, libpython3.8, libpython3.8-minimal, libpython3.9-testsuite, libpython3.8-testsuite, python3.8-venv, python3.9-examples, python3.8-dev, libpython3.8-dev, python3.8-full, python3.8-examples, python3.9-minimal, libpython3.9-stdlib, libpython3.8-stdlib, python3.9-full, python3.9-doc, libpython3.9-dev, python3.8, libpython3.9-minimal, python3.8-minimal, python3.9
• USN-6891-1: libpython3.5, python3.8-doc, libpython3.11-stdlib, python3.10-examples, python3.11-nopie, libpython3.8, python3.12-doc, libpython3.8-minimal, python3.10-full, python3.12-full, python3.12-nopie, libpython3.7-dev, python3.7-minimal, python3.11-dev, libpython3.11-minimal, libpython3.12-stdlib, python3.6-doc, python3.5, libpython3.6-dev, python3.11-minimal, python3.6-examples, python3.11-full, python3.10-dev, libpython3.9-dev, libpython3.9-minimal, libpython3.5-stdlib, python3.12-examples, python3.7-dev, python3.12-venv, python3.9-dev, libpython3.9, python3.5-examples, libpython3.5-dev, python3.9-venv, idle-python3.9, python3.12-minimal, libpython3.12-testsuite, python3.5-venv, libpython3.11-dev, python3.10-venv, libpython3.10-dev, python3.12-dev, libpython3.11, python3.12, python3.8-examples, libpython3.8-stdlib, python3.6-dev, python3.7-examples, libpython3.6-testsuite, libpython3.10-testsuite, python3.9-doc, python3.11, idle-python3.11, python3.7-venv, libpython3.7-testsuite, idle-python3.8, libpython3.6-minimal, idle-python3.7, libpython3.7-minimal, python3.8-venv, python3.9-examples, libpython3.10-minimal, idle-python3.10, python3.6-minimal, python3.5-doc, libpython3.10, python3.7-doc, libpython3.8-dev, python3.5-dev, idle-python3.6, python3.11-examples, idle-python3.5, libpython3.12-dev, python3.8-full, libpython3.6, libpython3.9-stdlib, python3.6, idle-python3.12, libpython3.7, python3.10-doc, python3.8-minimal, python3.10-nopie, libpython3.6-stdlib, libpython3.10-stdlib, python3.6-venv, libpython3.5-minimal, libpython3.9-testsuite, libpython3.8-testsuite, libpython3.12, libpython3.11-testsuite, libpython3.12-minimal, python3.8-dev, python3.5-minimal, python3.9-minimal, python3.10, python3.10-minimal, python3.9-full, python3.8, python3.11-doc, python3.7, libpython3.7-stdlib, python3.11-venv, libpython3.5-testsuite, python3.9