agent/Core/Controller/SendRequest.cpp in Phusion Passenger before 4.0.60 and 5.0.x before 5.0.22, when used in Apache integration mode or in standalone mode without a filtering proxy, allows remote attackers to spoof headers passed to applications by using an _ (underscore) character instead of a - (dash) character in an HTTP header, as demonstrated by an X_User header.
| Package (Ecosystem) | Introduced | Fixed | Limit |
|---|---|---|---|
| passenger(RubyGems) | 0 | 4.0.60 | N/A |
| passenger(RubyGems) | 5.0.0 | 5.0.22 | N/A |
CVSS Metrics
