#VU76609 Uncontrolled Recursion in LibSass - CVE-2018-20821

Vulnerability identifier: #VU76609

Vulnerability risk: Medium

CVSSv4.0: 6.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2018-20821

CWE-ID: CWE-674

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
LibSass
Universal components / Libraries / Libraries used by multiple products

Vendor: Sass

Description

The vulnerability allows a remote attacker to gain access to potentially sensitive information.

The vulnerability exists due to uncontrolled recursion in Sass::Parser::parse_css_variable_value in parser.cpp. A remote attacker can trigger the vulnerability and gain access to potentially sensitive information.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

LibSass: before 3.6.0

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External links
https://github.com/sass/libsass/issues/2658
https://lists.opensuse.org/opensuse-security-announce/2019-07/msg00047.html
https://lists.opensuse.org/opensuse-security-announce/2019-07/msg00051.html
https://lists.opensuse.org/opensuse-security-announce/2019-08/msg00027.html

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.