Bug 2403083 (CVE-2025-55248)

Summary:	CVE-2025-55248 dotnet: .NET Information Disclosure Vulnerability
Product:	[Other] Security Response	Reporter:	OSIDB Bzimport <bzimport>
Component:	vulnerability	Assignee:	Product Security DevOps Team <prodsec-dev>
Status:	NEW ---	QA Contact:
Severity:	high	Docs Contact:
Priority:	high
Version:	unspecified	CC:	sdawley, security-response-team
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	---
Doc Text:	A flaw exists in certain .NET builds where a man-in-the-middle (MITM) attacker can prevent or downgrade TLS between a client and an SMTP server. This may cause the client to send credentials or message data over an unencrypted connection, exposing sensitive information to the attacker.	Story Points:	---
Clone Of:		Environment:
Last Closed:		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:	2404147, 2404148, 2404149, 2404150
Bug Blocks:

Description OSIDB Bzimport 2025-10-10 13:17:03 UTC

MITM (man in the middle) attacker may prevent use of TLS between client
and SMTP server, forcing client to send data over unencrypted
connection.

Affected versions:
.NET 8.0 (that's the RHEL dotnet8.0 package)
.NET 9.0 (that's the RHEL dotnet9.0 package)

Comment 1 errata-xmlrpc 2025-10-15 15:48:52 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2025:18148 https://access.redhat.com/errata/RHSA-2025:18148

Comment 2 errata-xmlrpc 2025-10-15 16:06:19 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2025:18149 https://access.redhat.com/errata/RHSA-2025:18149

Comment 3 errata-xmlrpc 2025-10-15 16:13:40 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10

Via RHSA-2025:18152 https://access.redhat.com/errata/RHSA-2025:18152

Comment 4 errata-xmlrpc 2025-10-15 16:28:45 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2025:18150 https://access.redhat.com/errata/RHSA-2025:18150

Comment 5 errata-xmlrpc 2025-10-15 16:30:05 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10

Via RHSA-2025:18153 https://access.redhat.com/errata/RHSA-2025:18153

Comment 6 errata-xmlrpc 2025-10-15 16:49:11 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2025:18151 https://access.redhat.com/errata/RHSA-2025:18151

Comment 7 errata-xmlrpc 2025-10-16 15:35:37 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.4 Extended Update Support

Via RHSA-2025:18256 https://access.redhat.com/errata/RHSA-2025:18256