#VU85027 Use-after-free in LibSass - CVE-2018-11499

Vulnerability identifier: #VU85027

Vulnerability risk: High

CVSSv4.0: 8.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber]

CVE-ID: CVE-2018-11499

CWE-ID: CWE-416

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 compromise vulnerable system.

The vulnerability exists due to a use-after-free error in handle_error() function in sass_context.cpp in LibSass. A remote attacker can cause a denial of service (application crash) or possibly unspecified other impact.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

LibSass: 3.4.0 RC1 - 3.5.4

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External links
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
https://github.com/sass/libsass/issues/2643

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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.