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CVE-2023-23934

Status Candidate

Overview

Werkzeug is a comprehensive WSGI web application library. Browsers may allow "nameless" cookies that look like `=value` instead of `key=value`. A vulnerable browser may allow a compromised application on an adjacent subdomain to exploit this to set a cookie like `=__Host-test=bad` for another subdomain. Werkzeug prior to 2.2.3 will parse the cookie `=__Host-test=bad` as __Host-test=bad`. If a Werkzeug application is running next to a vulnerable or malicious subdomain which sets such a cookie using a vulnerable browser, the Werkzeug application will see the bad cookie value but the valid cookie key. The issue is fixed in Werkzeug 2.2.3.

Related Files

Debian Security Advisory 5470-1
Posted Aug 7, 2023
Authored by Debian | Site debian.org

Debian Linux Security Advisory 5470-1 - Several vulnerabilities were discovered in python-werkzeug, a collection of utilities for WSGI applications.

tags | advisory, vulnerability, python
systems | linux, debian
advisories | CVE-2023-23934, CVE-2023-25577
SHA-256 | fbfd0844807d42d5eb5a87ffa65a7a37c372c6b11c185ce8b31d829df350079a
Ubuntu Security Notice USN-5948-2
Posted Jun 21, 2023
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 5948-2 - USN-5948-1 fixed vulnerabilities in Werkzeug. This update provides the corresponding updates for Ubuntu 23.04. It was discovered that Werkzeug did not properly handle the parsing of nameless cookies. A remote attacker could possibly use this issue to shadow other cookies.

tags | advisory, remote, vulnerability
systems | linux, ubuntu
advisories | CVE-2023-23934, CVE-2023-25577
SHA-256 | ba83f0682203fee0c453506a48dc08ac74fabba29b013868628afba2887e223f
Ubuntu Security Notice USN-5948-1
Posted Mar 14, 2023
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 5948-1 - It was discovered that Werkzeug did not properly handle the parsing of nameless cookies. A remote attacker could possibly use this issue to shadow other cookies. It was discovered that Werkzeug could be made to process unlimited number of multipart form data parts. A remote attacker could possibly use this issue to cause Werkzeug to consume resources, leading to a denial of service.

tags | advisory, remote, denial of service
systems | linux, ubuntu
advisories | CVE-2023-23934, CVE-2023-25577
SHA-256 | 207d0bc3fb2eccfc91fe6aa3fafe7926b6b250363338d8de7dacdbc1a1962227
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