CVE-2018-20821
First published: Tue Apr 23 2019(Updated: )
LibSass is vulnerable to a denial of service, caused by uncontrolled recursion in Sass::Parser::parse_css_variable_value in parser.cpp. By persuading a victim to open a specially-crafted file, a remote attacker could exploit this vulnerability to cause the application to crash.
Credit: cve@mitre.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| libsass | <=3.5.5 | |
| IBM Data Virtualization on Cloud Pak for Data | <=3.0 | |
| IBM Watson Query with Cloud Pak for Data as a Service | <=2.2 | |
| IBM Watson Query with Cloud Pak for Data as a Service | <=2.1 | |
| IBM Watson Query with Cloud Pak for Data as a Service | <=2.0 | |
| IBM Data Virtualization on Cloud Pak for Data | <=1.8 | |
| IBM Data Virtualization on Cloud Pak for Data | <=1.7 |
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Reference Links
- https://github.com/sass/libsass/issues/2658
- http://lists.opensuse.org/opensuse-security-announce/2019-07/msg00047.html
- http://lists.opensuse.org/opensuse-security-announce/2019-07/msg00051.html
- http://lists.opensuse.org/opensuse-security-announce/2019-08/msg00027.html
- https://www.ibm.com/support/pages/node/7183851 (Advisory)
Frequently Asked Questions
What is CVE-2018-20821?
CVE-2018-20821 is a vulnerability in the parsing component of LibSass through version 3.5.5 that allows attackers to cause a denial-of-service through uncontrolled recursion.
What is the affected software?
The affected software is Sass-lang Libsass versions up to and including 3.5.5.
What is the severity of CVE-2018-20821?
The severity of CVE-2018-20821 is medium with a CVSS score of 6.5.
How can attackers exploit CVE-2018-20821?
Attackers can exploit CVE-2018-20821 by triggering uncontrolled recursion in the Sass::Parser::parse_css_variable_value function in parser.cpp.
Is there a fix for CVE-2018-20821?
Yes, upgrading to a version of LibSass beyond 3.5.5 will fix CVE-2018-20821.
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