Bug 1588682 (CVE-2018-11693)

Summary:	CVE-2018-11693 libsass: Heap buffer over read in function Sass::Prelexer::skip_over_scopes in prelexer.hpp
Product:	[Other] Security Response	Reporter:	Pedro Sampaio <psampaio>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED ERRATA	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	aurelien, fmuellner
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	libsass 3.6.0	Doc Type:	If docs needed, set a value
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2021-10-25 09:55:19 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:	1588684, 1588683, 1588685
Bug Blocks:	1754498

Description Pedro Sampaio 2018-06-07 17:29:06 UTC

An issue was discovered in LibSaas through 3.5.4. An out-of-bounds read of a memory region was found in the function Sass::Prelexer::skip_over_scopes which could be leveraged by an attacker to disclose information or manipulated to read from unmapped memory causing a denial of service.

Upstream issue:

https://github.com/sass/libsass/issues/2661

Comment 1 Pedro Sampaio 2018-06-07 17:29:23 UTC

Created libsass tracking bugs for this issue:

Affects: epel-7 [bug 1588684]
Affects: fedora-all [bug 1588685]

Comment 3 Riccardo Schirone 2020-01-14 16:40:07 UTC

Upstream fix:
https://github.com/sass/libsass/commit/b3374e3fd1a0c3658644d2bad24e4a0ff2e0dcea