Vulnerability Details 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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.143
EPSS Ranking 94.0%
CVSS Severity
CVSS v3 Score 9.8
CVSS v2 Score 10.0
References
- http://dgb.github.io/2019/04/05/bootstrap-sass-backdoor.html
- https://github.com/twbs/bootstrap-sass/issues/1195
- https://snyk.io/blog/malicious-remote-code-execution-backdoor-discovered-in-the-popular-bootstrap-sass-ruby-gem/
- https://snyk.io/vuln/SNYK-RUBY-BOOTSTRAPSASS-174093
- http://dgb.github.io/2019/04/05/bootstrap-sass-backdoor.html
- https://github.com/twbs/bootstrap-sass/issues/1195
- https://snyk.io/blog/malicious-remote-code-execution-backdoor-discovered-in-the-popular-bootstrap-sass-ruby-gem/
- https://snyk.io/vuln/SNYK-RUBY-BOOTSTRAPSASS-174093
Products affected by CVE-2019-10842
-
cpe:2.3:a:getbootstrap:bootstrap-sass:3.2.0.3