PT-2019-10261 · Sass+2 · Libsass+2

Hongxuchen · CVE-2018-20822 · Published 2019-04-23 · Updated 2023-02-28

Positive Technologies (AI Summary)

CVSS v3.1

6.5

Medium

Base vector

AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

Name of the Vulnerable Software and Affected Versions: LibSass version 3.5.4

Description: The issue allows attackers to cause a denial-of-service due to uncontrolled recursion. This occurs in the Sass::Complex Selector::perform function in ast.hpp and the Sass::Inspect::operator in inspect.cpp.

Recommendations: For LibSass version 3.5.4, consider disabling the Sass::Complex Selector::perform function and the Sass::Inspect::operator as a temporary workaround until a patch is available. Restrict access to the affected modules to minimize the risk of exploitation.

Exploit

Fix

DoS

Uncontrolled Recursion

Weakness Enumeration

CWE-674

Related Identifiers

ALT-PU-2020-1653

CVE-2018-20822

MGASA-2020-0049

OPENSUSE-SU-2019:1791-1

OPENSUSE-SU-2019:1800-1

OPENSUSE-SU-2019:1883-1

OPENSUSE-SU-2019_1791-1

OPENSUSE-SU-2024:10988-1

Affected Products

Alt Linux

Libsass

Suse

References · 91

• 🔥 https://github.com/sass/libsass/issues/2671 · Exploit
• http://lists.opensuse.org/opensuse-security-announce/2019-07/msg00047.html · Vendor Advisory
• http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-11499 · Security Note
• https://osv.dev/vulnerability/MGASA-2020-0049 · Vendor Advisory
• http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-11697 · Security Note
• https://osv.dev/vulnerability/CVE-2018-20822 · Vendor Advisory
• https://osv.dev/vulnerability/openSUSE-SU-2019:1791-1 · Vendor Advisory
• http://lists.opensuse.org/opensuse-security-announce/2019-07/msg00051.html · Vendor Advisory
• https://osv.dev/vulnerability/openSUSE-SU-2019:1800-1 · Vendor Advisory
• https://osv.dev/vulnerability/DEBIAN-CVE-2018-20822 · Vendor Advisory
• https://security-tracker.debian.org/tracker/CVE-2018-20822 · Vendor Advisory
• https://ubuntu.com/security/CVE-2018-20822 · Vendor Advisory
• http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-19839 · Security Note
• http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-19837 · Security Note
• https://osv.dev/vulnerability/UBUNTU-CVE-2018-20822 · Vendor Advisory