RCE in Getbootstrap Bootstrap-Sass
CVE-2019-10842
Arbitrary code execution (via backdoor code) was discovered in bootstrap-sass 3.2.0.3, when downloaded from rubygems.org. An unauthenticated attacker can craft the ___cfduid cookie value with base64 arbitrary code to be executed via eval(), which can be leveraged to execute arbitrary code on the target system. Note that there are three underscore characters in the cookie name. This is unrelated to the __cfduid cookie that is legitimately used by Cloudflare.
Vulnerability class: RCE (Remote Code Execution)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.049 (91.9th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 92nd percentile — 91.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.049 · newest: 0.049 · change: 0.000
Affected products
- Getbootstrap Bootstrap-Sass — versions 3.2.0.3
Weakness classification (CWE)
Public proof-of-concept exploits
References
- github.com/twbs/bootstrap-sass/issues/1195 (Third Party Advisory, Issue Tracking)
- snyk.io/blog/malicious-remote-code-execution-backdoor-discovered-in-the-popular… (Exploit, Third Party Advisory)
- snyk.io/vuln/SNYK-RUBY-BOOTSTRAPSASS-174093 (Exploit, Third Party Advisory)
- dgb.github.io/2019/04/05/bootstrap-sass-backdoor.html (Third Party Advisory)
Frequently asked questions
- What is CVE-2019-10842?
- CVE-2019-10842 is a critical-severity vulnerability in Getbootstrap Bootstrap-Sass, classified under Code Injection. CVSS score: 9.8/10. Published 2019-04-04.
- How severe is CVE-2019-10842?
- Critical severity. CVSS v3 base score is 9.8 out of 10.
- Is CVE-2019-10842 known to be exploited?
- 3 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.