Bug 2189600

Summary:	CVE-2023-29552 openslp: Reflective denial of service amplification attack via UDP [fedora-all]
Product:	[Fedora] Fedora	Reporter:	Sandipan Roy <saroy>
Component:	openslp	Assignee:	Vitezslav Crhonek <vcrhonek>
Status:	CLOSED WONTFIX	QA Contact:	Fedora Extras Quality Assurance <extras-qa>
Severity:	high	Docs Contact:
Priority:	high
Version:	38	CC:	tdawson, vcrhonek
Target Milestone:	---	Keywords:	Security, SecurityTracking
Target Release:	---
Hardware:	Unspecified
OS:	Unspecified
Whiteboard:
Fixed In Version:		Doc Type:	No Doc Update
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2024-01-15 13:16:29 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:
Bug Blocks:	2183534

Description Sandipan Roy 2023-04-25 16:28:23 UTC

More information about this security flaw is available in the following bug:

http://bugzilla.redhat.com/show_bug.cgi?id=2183534

Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.

Comment 1 Sandipan Roy 2023-04-25 16:28:25 UTC

Use the following template to for the 'fedpkg update' request to submit an
update for this issue as it contains the top-level parent bug(s) as well as
this tracking bug.  This will ensure that all associated bugs get updated
when new packages are pushed to stable.

=====

# bugfix, security, enhancement, newpackage (required)
type=security

# low, medium, high, urgent (required)
severity=high

# testing, stable
request=testing

# Bug numbers: 1234,9876
bugs=2183534,2189600

# Description of your update
notes=Security fix for [PUT CVEs HERE]

# Enable request automation based on the stable/unstable karma thresholds
autokarma=True
stable_karma=3
unstable_karma=-3

# Automatically close bugs when this marked as stable
close_bugs=True

# Suggest that users restart after update
suggest_reboot=False

======

Additionally, you may opt to use the bodhi web interface to submit updates:

https://bodhi.fedoraproject.org/updates/new

Comment 2 Vitezslav Crhonek 2024-01-15 13:16:29 UTC

This flaw is a network protocol design flaw, a software fix is not easily possible.

SLP was not intended to be made available to the public Internet. According to RFC 2165 ([1]):
"Service Location provides a dynamic configuration mechanism for
applications in local area networks.  It is not a global resolution
system for the entire Internet; rather it is intended to serve
enterprise networks with shared services."

SLP should be disabled on all systems running on untrusted networks, like those directly connected to the Internet.
If that is not possible, then firewalls should be configured to block or filter traffic on UDP and TCP port 427.
This will prevent external attackers from accessing the SLP service.

[1] https://datatracker.ietf.org/doc/html/rfc2165