Bug 1512982 (CVE-2017-8585)

Summary:	CVE-2017-8585 .NET Core: DoS via invalid culture
Product:	[Other] Security Response	Reporter:	Trevor Jay <tjay>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED ERRATA	QA Contact:
Severity:	low	Docs Contact:
Priority:	low
Version:	unspecified	CC:	bgollahe, dbhole, kanderso, lzachar, omajid, rwagner, security-response-team
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	dotnetcore 1.0.7, dotnetcore 1.1.4	Doc Type:	If docs needed, set a value
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2017-12-01 11:34:12 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:	1513073, 1513074, 1513076, 1513077
Bug Blocks:	1512757

Description Trevor Jay 2017-11-14 14:46:20 UTC

By providing an invalid culture, an attacker can cause a recursive lookup that leads to a denial of service.

Comment 3 Omair Majid 2017-11-15 20:32:39 UTC

The upstream note about this CVE (https://github.com/dotnet/announcements/issues/34) states:

"""
System administrators are advised to update their .NET Core runtimes to versions 1.0.7 and 1.1.4.
"""

It looks like this was fixed even before .NET Core 1.1.5 and 1.0.8.

The announcement also states:

"""
.NET Core 1.x applications are only affected if running on Windows 10 or Windows 2016.
"""

This doesnt appear to affect Linux. But due to how self-contained applications can be built for other platforms, this needs to be fixed everywhere.

Comment 4 errata-xmlrpc 2017-11-20 11:46:13 UTC

This issue has been addressed in the following products:

  dotNET on RHEL

Via RHSA-2017:3248 https://access.redhat.com/errata/RHSA-2017:3248

Comment 5 Tomas Hoger 2017-12-01 11:34:12 UTC

Further details of this issue can be found in the upstream Microsoft advisories, and the advisory form the original reporter.

https://github.com/dotnet/announcements/issues/34
https://github.com/dotnet/corefx/issues/24703
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2017-8585
https://www.sidertia.com/Home/Community/Blog/2017/07/14/Microsoft-fixes-the-CVE-2017-8585-security-vulnerability-discovered-by-Sidertia-Team

Comment 6 Tomas Hoger 2017-12-01 11:35:04 UTC

External References:

https://github.com/dotnet/announcements/issues/34
https://www.sidertia.com/Home/Community/Blog/2017/07/14/Microsoft-fixes-the-CVE-2017-8585-security-vulnerability-discovered-by-Sidertia-Team