Use-after-free in Sass LibSass

1) Use-after-free

EUVDB-ID: #VU85027

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 - Use After Free

Exploit availability: No

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 - 3.5.4

CPE2.3

• cpe:2.3:a:sass:libsass:3.4.0:*:*:*:*:*:*:*
• cpe:2.3:a:sass:libsass:3.4.0:RC1:*:*:*:*:*:*
• cpe:2.3:a:sass:libsass:3.4.1:*:*:*:*:*:*:*

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

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.