Bug 1706044 (CVE-2018-20821) - CVE-2018-20821 libsass: parsing component allows attackers to cause denial-of-service
Summary: CVE-2018-20821 libsass: parsing component allows attackers to cause denial-of...
Keywords:
Status: CLOSED NOTABUG
Alias: CVE-2018-20821
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 1706052 1706051
Blocks: 1706049
TreeView+ depends on / blocked
 
Reported: 2019-05-03 12:37 UTC by Dhananjay Arunesh
Modified: 2021-02-16 21:59 UTC (History)
2 users (show)

Fixed In Version:
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Last Closed: 2019-05-15 12:11:15 UTC
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Description Dhananjay Arunesh 2019-05-03 12:37:50 UTC 
The parsing component in LibSass through 3.5.5 allows attackers to cause a denial-of-service (uncontrolled recursion in Sass::Parser::parse_css_variable_value in parser.cpp).

Reference:
https://github.com/sass/libsass/issues/2658
Comment 1 Dhananjay Arunesh 2019-05-03 12:42:31 UTC 
Created libsass tracking bugs for this issue:

Affects: fedora-all [bug 1706051]
Comment 2 Dhananjay Arunesh 2019-05-03 12:43:06 UTC 
Created libsass tracking bugs for this issue:

Affects: epel-7 [bug 1706052]
Comment 3 Riccardo Schirone 2019-05-15 10:06:27 UTC 
First vulnerable commit:
https://github.com/sass/libsass/commit/efd97dae376de50b3e6ed724337c4f274a21491d
Comment 4 Riccardo Schirone 2019-05-15 10:07:40 UTC 
Upstream patch:
https://github.com/sass/libsass/commit/f2db04883e5fff4e03777dcc1eb60d4373c45be1
Comment 5 Riccardo Schirone 2019-05-15 12:11:17 UTC 
Statement:

This issue did not affect the versions of libsass as shipped with Red Hat Enterprise Linux 8 as the flaw was introduced in a newer version of the library.
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