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Fedora 42: python-kdcproxy Critical DoS Issue Addressed 2025-068c570cbf

fedora
Calendar Grey December 5, 2025
Dist Fedora Esm H88
Critical update to python-kdcproxy in Fedora 42 fixes DoS issue and improves DNS realm discovery. Install immediately.
New upstream version (1.1.0) Use DNS discovery for declared realms only (CVE-2025-59088) Fix DoS vulnerability based on unbounded TCP buffering (CVE-2025-59089)

Summary

This package contains a Python WSGI module for proxying KDC requests over

HTTP by following the MS-KKDCP protocol. It aims to be simple to deploy, with

minimal configuration.

Update Information:

New upstream version (1.1.0) Use DNS discovery for declared realms only (CVE-2025-59088) Fix DoS vulnerability based on unbounded TCP buffering (CVE-2025-59089)

Topics%20covered

Topics Covered

security advisory fedora critical DoS python-kdcproxy tcp buffering

Change Log

* Wed Nov 19 2025 Julien Rische - 1.1.0-1 - New upstream version (1.1.0) - Use DNS discovery for declared realms only (CVE-2025-59088) Resolves: rhbz#2414551 - Fix DoS vulnerability based on unbounded TCP buffering (CVE-2025-59089) Resolves: rhbz#2414553

References


[ 1 ] Bug #2414551 - CVE-2025-59088 python-kdcproxy: Unauthenticated SSRF via Realm\u2011Controlled DNS SRV [fedora-42] https://bugzilla.redhat.com/show_bug.cgi?id=2414551 [ 2 ] Bug #2414553 - CVE-2025-59089 python-kdcproxy: Remote DoS via unbounded TCP upstream buffering [fedora-42] https://bugzilla.redhat.com/show_bug.cgi?id=2414553

Update Instructions

This update can be installed with the "dnf" update program. Use su -c 'dnf upgrade --advisory FEDORA-2025-068c570cbf' at the command line. For more information, refer to the dnf documentation available at http://dnf.readthedocs.io/en/latest/command_ref.html#upgrade-command-label

Severity
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Name: python-kdcproxy
Product: Fedora 42
Version: 1.1.0
Release: 1.fc42
URL: https://github.com/latchset/kdcproxy
Summary: MS-KKDCP (kerberos proxy) WSGI module

Topics%20covered

Topics Covered

security advisory fedora critical DoS python-kdcproxy tcp buffering

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