#VU36344 Infinite loop in LibSass - CVE-2018-19826

Vulnerability identifier: #VU36344

Vulnerability risk: Medium

CVSSv4.0: 4.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2018-19826

CWE-ID: CWE-835

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 non-authenticated attacker to perform a denial of service (DoS) attack.

** DISPUTED ** In inspect.cpp in LibSass 3.5.5, a high memory footprint caused by an endless loop (containing a Sass::Inspect::operator()(Sass::String_Quoted*) stack frame) may cause a Denial of Service via crafted sass input files with stray '&' or '/' characters. NOTE: Upstream comments indicate this issue is closed as "won't fix" and "works as intended" by design.

Mitigation
Install update from vendor's website.

Vulnerable software versions

LibSass: 3.5.5

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External links
https://github.com/sass/libsass/issues/2781

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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.