Bug 1552060 (CVE-2018-0875)

Summary:	CVE-2018-0875 .NET Core: Hash Collision Denial of Service
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, bodavis, dbhole, jvanek, kanderso, lzachar, omajid, rjanekov, rwagner, security-response-team, zzambers
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	If docs needed, set a value
Doc Text:	It was found that string comparisons in .NET Core did not use a secure hashing algorithm. This could allow an attacker to predict string hashes and cause a denial of service by intentionally creating collisions thus forcing long look up times.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2019-06-10 10:16:29 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:	1552065, 1552066, 1552067
Bug Blocks:	1552050

Description Trevor Jay 2018-03-06 12:32:13 UTC

Case insensitive string comparison uses an insecure hashing algorithm which can be compromised in .NET Core 1.x (Unix) and .NET Core 2.0. The attack vector could be a Dictionary which uses case invariant keys.

Comment 4 Trevor Jay 2018-03-13 14:30:09 UTC

Acknowledgments:

Name: Ben Adams (Illyriad Games)

Comment 5 errata-xmlrpc 2018-03-14 15:50:41 UTC

This issue has been addressed in the following products:

  .NET Core on Red Hat Enterprise Linux

Via RHSA-2018:0522 https://access.redhat.com/errata/RHSA-2018:0522