Resource exhaustion in Sass-Lang Libsass
CVE-2018-19837
In LibSass prior to 3.5.5, Sass::Eval::operator()(Sass::Binary_Expression*) inside eval.cpp allows attackers to cause a denial-of-service resulting from stack consumption via a crafted sass file, because of certain incorrect parsing of '%' as a modulo operator in parser.cpp.
Vulnerability class: DoS (Denial of Service)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.018 (77.6th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 78th percentile — 77.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.018 · newest: 0.018 · change: +0.000
Affected products
Weakness classification (CWE)
Public proof-of-concept exploits
References
- github.com/sass/libsass/issues/2659 (Patch, Vendor Advisory)
- github.com/sass/libsass/commit/210fdff7a65370c2ae24e022a2b35da8c423cc5f (Exploit, Third Party Advisory)
- lists.opensuse.org/opensuse-security-announce/2019-07/msg00047.html (vendor-advisory)
- lists.opensuse.org/opensuse-security-announce/2019-07/msg00051.html (vendor-advisory)
- lists.opensuse.org/opensuse-security-announce/2019-08/msg00027.html (vendor-advisory)
Frequently asked questions
- What is CVE-2018-19837?
- CVE-2018-19837 is a medium-severity vulnerability in Sass-Lang Libsass, classified under Uncontrolled Resource Consumption. CVSS score: 6.5/10. Published 2018-12-04.
- How severe is CVE-2018-19837?
- Medium severity. CVSS v3 base score is 6.5 out of 10.
- Is CVE-2018-19837 known to be exploited?
- 6 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.