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Category:   Application (Generic)  >   Microsoft .NET Vendors:   Microsoft
(Red Hat Issues Fix) Microsoft .NET Lets Remote Users Modify Certain Files on the Target System
SecurityTracker Alert ID:  1042161
SecurityTracker URL:  http://securitytracker.com/id/1042161
CVE Reference:   CVE-2018-8416   (Links to External Site)
Date:  Nov 27 2018
Impact:   Modification of system information, Modification of user information
Fix Available:  Yes  Vendor Confirmed:  Yes  

Description:   A vulnerability was reported in Microsoft .NET. A remote user can modify files on the target system.

A remote user can send a specially crafted file requests to have the system create certain file locations on the target system.

The vendor notes that only certain file locations are permitted.

Danny Grander of Snyk reported this vulnerability.

Impact:   A remote user can modify certain files on the target system.
Solution:   Red Hat has issued a fix.

The Red Hat advisory is available at:

https://access.redhat.com/errata/RHSA-2018:3676

Vendor URL:  access.redhat.com/errata/RHSA-2018:3676 (Links to External Site)
Cause:   Access control error
Underlying OS:  Linux (Red Hat Enterprise)
Underlying OS Comments:  7

Message History:   This archive entry is a follow-up to the message listed below.
Nov 13 2018 Microsoft .NET Lets Remote Users Modify Certain Files on the Target System



 Source Message Contents

Subject:  [RHSA-2018:3676-01] Moderate: .NET Core on Red Hat Enterprise Linux security update

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA256

=====================================================================
                   Red Hat Security Advisory

Synopsis:          Moderate: .NET Core on Red Hat Enterprise Linux security update
Advisory ID:       RHSA-2018:3676-01
Product:           .NET Core on Red Hat Enterprise Linux
Advisory URL:      https://access.redhat.com/errata/RHSA-2018:3676
Issue date:        2018-11-27
CVE Names:         CVE-2018-8416 
=====================================================================

1. Summary:

An update for rh-dotnet21-dotnet is now available for .NET Core on Red Hat
Enterprise Linux.

Red Hat Product Security has rated this update as having a security impact
of Moderate. A Common Vulnerability Scoring System (CVSS) base score, which
gives a detailed severity rating, is available for each vulnerability from
the CVE link(s) in the References section.

2. Relevant releases/architectures:

.NET Core on Red Hat Enterprise Linux ComputeNode (v. 7) - x86_64
.NET Core on Red Hat Enterprise Linux Server (v. 7) - x86_64
.NET Core on Red Hat Enterprise Linux Workstation (v. 7) - x86_64

3. Description:

.NET Core is a managed software framework. It implements a subset of the
.NET framework APIs and several new APIs, and it includes a CLR
implementation.

A new version of .NET Core that addresses a security vulnerability is now
available. The updated version is .NET Core 2.1.5.

Security Fix(es):

* .NET Core: Arbitrary file and directory creation (CVE-2018-8416)

For more information, please refer to the upstream docs in the References
section.

4. Solution:

For details on how to apply this update, which includes the changes
described in this advisory, refer to:

https://access.redhat.com/articles/11258

5. Bugs fixed (https://bugzilla.redhat.com/):

1649693 - CVE-2018-8416 .NET Core: Arbitrary file and directory creation

6. Package List:

.NET Core on Red Hat Enterprise Linux ComputeNode (v. 7):

Source:
rh-dotnet21-dotnet-2.1.500-5.el7.src.rpm

x86_64:
rh-dotnet21-dotnet-2.1.500-5.el7.x86_64.rpm
rh-dotnet21-dotnet-debuginfo-2.1.500-5.el7.x86_64.rpm
rh-dotnet21-dotnet-host-2.1.6-5.el7.x86_64.rpm
rh-dotnet21-dotnet-runtime-2.1-2.1.6-5.el7.x86_64.rpm
rh-dotnet21-dotnet-sdk-2.1-2.1.500-5.el7.x86_64.rpm
rh-dotnet21-dotnet-sdk-2.1.5xx-2.1.500-5.el7.x86_64.rpm

.NET Core on Red Hat Enterprise Linux Server (v. 7):

Source:
rh-dotnet21-dotnet-2.1.500-5.el7.src.rpm

x86_64:
rh-dotnet21-dotnet-2.1.500-5.el7.x86_64.rpm
rh-dotnet21-dotnet-debuginfo-2.1.500-5.el7.x86_64.rpm
rh-dotnet21-dotnet-host-2.1.6-5.el7.x86_64.rpm
rh-dotnet21-dotnet-runtime-2.1-2.1.6-5.el7.x86_64.rpm
rh-dotnet21-dotnet-sdk-2.1-2.1.500-5.el7.x86_64.rpm
rh-dotnet21-dotnet-sdk-2.1.5xx-2.1.500-5.el7.x86_64.rpm

.NET Core on Red Hat Enterprise Linux Workstation (v. 7):

Source:
rh-dotnet21-dotnet-2.1.500-5.el7.src.rpm

x86_64:
rh-dotnet21-dotnet-2.1.500-5.el7.x86_64.rpm
rh-dotnet21-dotnet-debuginfo-2.1.500-5.el7.x86_64.rpm
rh-dotnet21-dotnet-host-2.1.6-5.el7.x86_64.rpm
rh-dotnet21-dotnet-runtime-2.1-2.1.6-5.el7.x86_64.rpm
rh-dotnet21-dotnet-sdk-2.1-2.1.500-5.el7.x86_64.rpm
rh-dotnet21-dotnet-sdk-2.1.5xx-2.1.500-5.el7.x86_64.rpm

These packages are GPG signed by Red Hat for security.  Our key and
details on how to verify the signature are available from
https://access.redhat.com/security/team/key/

7. References:

https://access.redhat.com/security/cve/CVE-2018-8416
https://access.redhat.com/security/updates/classification/#moderate
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2018-8416

8. Contact:

The Red Hat security contact is <secalert@redhat.com>. More contact
details at https://access.redhat.com/security/team/contact/

Copyright 2018 Red Hat, Inc.
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