========================================================================== Ubuntu Security Notice USN-5201-1 December 17, 2021
python3.8, python3.9 vulnerabilities ========================================================================== A security issue affects these releases of Ubuntu and its derivatives: - Ubuntu 21.04 - Ubuntu 20.04 LTS Summary:Python could be made to crash if it receives specially crafted input from a malicious server.
Software Description: - python3.9: Interactive high-level object-oriented language (version 3.9) - python3.8: An interactive high-level object-oriented language Details: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 21.04: libpython3.9-stdlib 3.9.5-3ubuntu0~21.04.1 python3.9 3.9.5-3ubuntu0~21.04.1 python3.9-minimal 3.9.5-3ubuntu0~21.04.1 Ubuntu 20.04 LTS: libpython3.8-stdlib 3.8.10-0ubuntu1~20.04.2 libpython3.9-stdlib 3.9.5-3ubuntu0~20.04.1 python3.8 3.8.10-0ubuntu1~20.04.2 python3.8-minimal 3.8.10-0ubuntu1~20.04.2 python3.9 3.9.5-3ubuntu0~20.04.1 python3.9-minimal 3.9.5-3ubuntu0~20.04.1 In general, a standard system update will make all the necessary changes. References: https://ubuntu.com/security/notices/USN-5201-1 CVE-2021-3737 Package Information: https://launchpad.net/ubuntu/+source/python3.9/3.9.5-3ubuntu0~21.04.1 https://launchpad.net/ubuntu/+source/python3.8/3.8.10-0ubuntu1~20.04.2 https://launchpad.net/ubuntu/+source/python3.9/3.9.5-3ubuntu0~20.04.1
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