Vulnerability identifier: #VU16232

Vulnerability risk: Low

CVSSv3.1: 4.8 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:P/RL:O/RC:C]

CVE-ID: CVE-2018-19837

CWE-ID: CWE-121

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 cause DoS condition.

The vulnerability exists due to stack-based buffer overflow in Sass::Eval::operator()(Sass::Binary_Expression*) inside eval.cpp when incorrect parsing of '%' as a modulo operator in parser.cpp. A remote attacker can send a specially crafted sass file, trigger memory corruption and cause the service to crash.

Mitigation
Update to version 3.5.5.

Vulnerable software versions

LibSass: 3.4.0 - 3.5.4

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External links
http://github.com/sass/libsass/issues/2659

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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. However, proof of concept for this vulnerability is available.