ADVISORIES
GEM
PATCHED VERSIONS
- >= 1.12.0
DESCRIPTION
Summary: Remote Code Execution
Unsafe handling of request parameters in the RPC HTTP server results in command injection.
Details
In lib/bitcoin/rpc/http_server.rb line 30-39, the JSON body of a
POST request is parsed into command and args variables. These
values are then passed to send, which is used to call an arbitrary
class method. However, there is no validation that the provided
command value is one of the expected RPC methods.
This means that an attacker could supply a command value such
as system, and then pass arbitrary system commands into the
args parameter and achieve remote code execution.
Remediation
Mitigating Factors:
- The RPC server is part of the experimental SPV node feature, which is not documented and has very few users.
- The SPV-related features may be removed in future releases.
Resolution:
-
Added whitelist validation to allow only RPC methods defined in
RequestHandler. -
Fixed in version 1.12.0.