CVE-2019-10842 Information

Description

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.

CVSS Vector

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Reference

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

Attack Complexity

LOW

Privileges Required

NONE

User Interaction Required

NONE

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

HIGH

Availability Impact

HIGH

Base Score

HIGH

Base Severity

9.8