RHSA-2019:0040 - Security Advisory

Topic

Updates for rh-dotnet21-dotnet and rh-dotnet22-dotnet are 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.

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.

New versions of .NET Core that address security vulnerabilities are now
available. The updated versions are .NET Core 2.1.5 and 2.2.1.

Security Fix(es):

• .NET Core: NCL - SocketsHttpHandler mishandling 1xx response as a final response leads to info disclosure (CVE-2019-0545)
• .NET Core: ANCM WebSocket DOS (CVE-2019-0548)
• .NET Core: Kestrel - WebSocket DoS via CancellationToken (CoreFX and ASP.NET) (CVE-2019-0564)

For more details about the security issue(s), including the impact, a CVSS score, and other related information, refer to the CVE page(s) listed in the References section.

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

Solution

Before applying this update, make sure all previously released errata
relevant to your system have been applied.

For details on how to apply this update, refer to:

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

Affected Products

• dotNET on RHEL (for RHEL Server) 1 x86_64
• dotNET on RHEL (for RHEL Workstation) 1 x86_64
• dotNET on RHEL (for RHEL Compute Node) 1 x86_64

Fixes

• BZ - 1660632 - CVE-2019-0545 .NET Core: NCL - SocketsHttpHandler mishandling 1xx response as a final response leads to info disclosure
• BZ - 1660634 - CVE-2019-0564 .NET Core: Kestrel - WebSocket DoS via CancellationToken (CoreFX and ASP.NET)
• BZ - 1660636 - CVE-2019-0548 .NET Core: ANCM WebSocket DOS

CVEs

• CVE-2019-0545
• CVE-2019-0548
• CVE-2019-0564

References

• https://access.redhat.com/security/updates/classification/#moderate
• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2019-0545
• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2019-0548
• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2019-0564