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CVE-2021-3733

Status Candidate

Overview

There's a flaw in urllib's AbstractBasicAuthHandler class. An attacker who controls a malicious HTTP server that an HTTP client (such as web browser) connects to, could trigger a Regular Expression Denial of Service (ReDOS) during an authentication request with a specially crafted payload that is sent by the server to the client. The greatest threat that this flaw poses is to application availability.

Related Files

Red Hat Security Advisory 2022-1821-01
Posted May 11, 2022
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2022-1821-01 - Python is an interpreted, interactive, object-oriented programming language that supports modules, classes, exceptions, high-level dynamic data types, and dynamic typing. The python27 packages provide a stable release of Python 2.7 with a number of additional utilities and database connectors for MySQL and PostgreSQL. Issues addressed include a denial of service vulnerability.

tags | advisory, denial of service, python
systems | linux, redhat
advisories | CVE-2021-3733, CVE-2021-3737, CVE-2021-4189, CVE-2021-43818, CVE-2022-0391
SHA-256 | 7f5d07cb76947dd97d0ef4499761f3a21f5ac6ce8b664d628ff9051f4d8f3ad5
Red Hat Security Advisory 2022-1764-01
Posted May 11, 2022
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2022-1764-01 - Python is an interpreted, interactive, object-oriented programming language, which includes modules, classes, exceptions, very high level dynamic data types and dynamic typing. Python supports interfaces to many system calls and libraries, as well as to various windowing systems. Issues addressed include a denial of service vulnerability.

tags | advisory, denial of service, python
systems | linux, redhat
advisories | CVE-2021-3733, CVE-2021-3737, CVE-2021-43818, CVE-2022-0391
SHA-256 | 7031e93a404f5038380ef83ca82a615ac3678cf775d367c8e05fb73cb59cd5b0
Red Hat Security Advisory 2022-1663-01
Posted May 2, 2022
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2022-1663-01 - Python is an interpreted, interactive, object-oriented programming language, which includes modules, classes, exceptions, very high level dynamic data types and dynamic typing. Python supports interfaces to many system calls and libraries, as well as to various windowing systems. Issues addressed include a denial of service vulnerability.

tags | advisory, denial of service, python
systems | linux, redhat
advisories | CVE-2021-3733, CVE-2021-3737, CVE-2021-4189, CVE-2022-0391
SHA-256 | 6432414f7b8a6571ed395cf657578903108760e6c22f8983c8ddccfd17747480
Ubuntu Security Notice USN-5199-1
Posted Dec 17, 2021
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 5199-1 - 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 condition for a client. It was discovered that the Python urllib http client could enter into an infinite loop when incorrectly handling certain server responses. Specially crafted traffic from a malicious HTTP server could cause a denial of service condition for a client. Various other issues were also addressed.

tags | advisory, web, denial of service, python
systems | linux, ubuntu
advisories | CVE-2021-3733, CVE-2021-3737
SHA-256 | e86e38e0b9b633e7b95fa55ad292060af6dfd4ee2f4b514fc7b7010bdd95c697
Ubuntu Security Notice USN-5200-1
Posted Dec 17, 2021
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 5200-1 - 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 condition for a client. 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 condition for a client. Various other issues were also addressed.

tags | advisory, web, denial of service, python
systems | linux, ubuntu
advisories | CVE-2020-8492, CVE-2021-3733, CVE-2021-3737
SHA-256 | 729bc78597e4fd0f17e876cb9c891d709d4ad254691f0fa2f4c7241f79beb5f0
Red Hat Security Advisory 2021-5191-02
Posted Dec 17, 2021
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2021-5191-02 - Red Hat 3scale API Management delivers centralized API management features through a distributed, cloud-hosted layer. It includes built-in features to help in building a more successful API program, including access control, rate limits, payment gateway integration, and developer experience tools. This advisory is intended to use with Container Images, for Red Hat 3scale API Management 2.11.1. Issues addressed include an XML injection vulnerability.

tags | advisory
systems | linux, redhat
advisories | CVE-2020-26247, CVE-2020-36385, CVE-2021-0512, CVE-2021-22946, CVE-2021-22947, CVE-2021-33928, CVE-2021-33929, CVE-2021-33930, CVE-2021-33938, CVE-2021-3656, CVE-2021-3733
SHA-256 | 222e9e194871a86f08f51b797c06b520b5e808c822dbc8abe7f4de9d3c85287c
Red Hat Security Advisory 2021-4766-01
Posted Nov 23, 2021
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2021-4766-01 - Red Hat OpenShift Serverless release of the OpenShift Serverless Operator. This version of the OpenShift Serverless Operator is supported on Red Hat OpenShift Container Platform versions 4.6, 4.7, 4.8 and 4.9, and includes security and bug fixes and enhancements. For more information, see the documentation listed in the References section.

tags | advisory
systems | linux, redhat
advisories | CVE-2021-22946, CVE-2021-22947, CVE-2021-33928, CVE-2021-33929, CVE-2021-33930, CVE-2021-33938, CVE-2021-36221, CVE-2021-3733
SHA-256 | 0a78d0e1931087baa5332f57d804a1bee7c1d664fecea39758b98fa436ddda6c
Red Hat Security Advisory 2021-4725-03
Posted Nov 18, 2021
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2021-4725-03 - OpenShift Virtualization is Red Hat's virtualization solution designed for Red Hat OpenShift Container Platform. This advisory contains OpenShift Virtualization 2.6.8 images.

tags | advisory
systems | linux, redhat
advisories | CVE-2020-25648, CVE-2021-22922, CVE-2021-22923, CVE-2021-22924, CVE-2021-29923, CVE-2021-34558, CVE-2021-36222, CVE-2021-3653, CVE-2021-3733, CVE-2021-37750
SHA-256 | 00aec26b5e44879b921222ad5caa4a2a5bb4ed97adfe718c6cc6619b1e9c65c6
Red Hat Security Advisory 2021-4628-01
Posted Nov 17, 2021
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2021-4628-01 - Openshift Logging Bug Fix Release. Issues addressed include a code execution vulnerability.

tags | advisory, code execution
systems | linux, redhat
advisories | CVE-2020-36385, CVE-2021-0512, CVE-2021-22946, CVE-2021-22947, CVE-2021-23369, CVE-2021-23383, CVE-2021-33928, CVE-2021-33929, CVE-2021-33930, CVE-2021-33938, CVE-2021-3656, CVE-2021-3733
SHA-256 | ac277430a1b1b05dba76cecef03900e9e3030dda5c7eafc2dd739d28f122ce68
Red Hat Security Advisory 2021-4618-01
Posted Nov 12, 2021
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2021-4618-01 - Red Hat Advanced Cluster Management for Kubernetes 2.4.0 images Red Hat Advanced Cluster Management for Kubernetes provides the capabilities to address common challenges that administrators and site reliability engineers face as they work across a range of public and private cloud environments. Clusters and applications are all visible and managed from a single console—with security policy built in. This advisory contains the container images for Red Hat Advanced Cluster Management for Kubernetes, which fix several bugs and security issues. Issues addressed include buffer overflow, denial of service, information leakage, integer overflow, out of bounds read, and path sanitization vulnerabilities.

tags | advisory, denial of service, overflow, vulnerability
systems | linux, redhat
advisories | CVE-2020-36385, CVE-2021-0512, CVE-2021-22922, CVE-2021-22923, CVE-2021-22924, CVE-2021-22946, CVE-2021-22947, CVE-2021-23017, CVE-2021-32626, CVE-2021-32627, CVE-2021-32628, CVE-2021-32672, CVE-2021-32675, CVE-2021-32687, CVE-2021-32690, CVE-2021-32803, CVE-2021-32804, CVE-2021-33623, CVE-2021-33928, CVE-2021-33929, CVE-2021-33930, CVE-2021-33938, CVE-2021-36222, CVE-2021-3656, CVE-2021-3711, CVE-2021-3712, CVE-2021-3733
SHA-256 | 14809d9261f291a519a153713fcca44c926124a2a48c8d989887911783dba47f
Red Hat Security Advisory 2021-4160-03
Posted Nov 10, 2021
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2021-4160-03 - Python is an interpreted, interactive, object-oriented programming language, which includes modules, classes, exceptions, very high level dynamic data types and dynamic typing. Python supports interfaces to many system calls and libraries, as well as to various windowing systems. Issues addressed include cross site scripting, denial of service, and information leakage vulnerabilities.

tags | advisory, denial of service, vulnerability, xss, python
systems | linux, redhat
advisories | CVE-2021-28957, CVE-2021-29921, CVE-2021-33503, CVE-2021-3426, CVE-2021-3572, CVE-2021-3733, CVE-2021-3737
SHA-256 | d4c975c8f0fd0283493287448972680095337bb6113fc44f4837d867665d4273
Red Hat Security Advisory 2021-4057-01
Posted Nov 2, 2021
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2021-4057-01 - Python is an interpreted, interactive, object-oriented programming language, which includes modules, classes, exceptions, very high level dynamic data types and dynamic typing. Python supports interfaces to many system calls and libraries, as well as to various windowing systems. Issues addressed include a denial of service vulnerability.

tags | advisory, denial of service, python
systems | linux, redhat
advisories | CVE-2021-3733
SHA-256 | 498494042eae465560ec74f9c3db823f41dcb7cc6774fcf32c2be912564c3a6a
Ubuntu Security Notice USN-5083-1
Posted Sep 17, 2021
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 5083-1 - It was discovered that Python incorrectly handled certain RFCs. An attacker could possibly use this issue to cause a denial of service. This issue only affected Ubuntu 16.04 ESM. It was discovered that Python incorrectly handled certain server responses. An attacker could possibly use this issue to cause a denial of service.

tags | advisory, denial of service, python
systems | linux, ubuntu
advisories | CVE-2021-3733, CVE-2021-3737
SHA-256 | cf1c664ac3030e4cd34e05174e101afebd1645b1bdeba83b3242a64505d95995
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