Bug 1671376 (CVE-2018-19826)

Summary:	CVE-2018-19826 libsass: Infinite loop in Sass::Inspect::operator() function resulting in a denial of service
Product:	[Other] Security Response	Reporter:	Andrej Nemec <anemec>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED NOTABUG	QA Contact:
Severity:	low	Docs Contact:
Priority:	low
Version:	unspecified	CC:	aurelien, fmuellner
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	If docs needed, set a value
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2019-02-21 15:03:10 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:	1671395, 1671396
Bug Blocks:	1671393

Description Andrej Nemec 2019-01-31 14:00:47 UTC

In inspect.cpp in LibSass 3.5.5, a high memory footprint caused by an endless loop (containing a Sass::Inspect::operator()(Sass::String_Quoted*) stack frame) may cause a Denial of Service via crafted sass input files with stray '&' or '/' characters.

Upstream issue:

https://github.com/sass/libsass/issues/2781

Comment 1 Andrej Nemec 2019-01-31 14:16:21 UTC

Created libsass tracking bugs for this issue:

Affects: epel-7 [bug 1671396]
Affects: fedora-all [bug 1671395]

Comment 3 Riccardo Schirone 2019-02-21 15:03:10 UTC

Closing as NOTABUG because upstream believes this is "by design" and not an error in the code. See https://github.com/sass/libsass/issues/2781#issuecomment-447202429