========================================================================== Ubuntu Security Notice USN-5200-1 December 17, 2021
python3.7, python3.8 vulnerabilities ========================================================================== A security issue affects these releases of Ubuntu and its derivatives: - Ubuntu 18.04 LTS Summary:Python could be made to crash if it receives specially crafted input from a malicious server.
Software Description: - 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. Speciallycrafted 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 LTS: libpython3.7-stdlib 3.7.5-2ubuntu1~18.04.2 libpython3.8-stdlib 3.8.0-3ubuntu1~18.04.2 python3.7 3.7.5-2ubuntu1~18.04.2 python3.7-minimal 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: https://ubuntu.com/security/notices/USN-5200-1 CVE-2020-8492, CVE-2021-3733, CVE-2021-3737 Package Information: https://launchpad.net/ubuntu/+source/python3.7/3.7.5-2ubuntu1~18.04.2 https://launchpad.net/ubuntu/+source/python3.8/3.8.0-3ubuntu1~18.04.2
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