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From "Michael Patrick (JIRA)" <>
Subject [jira] [Created] (THRIFT-4682) C++ TBinaryProtocol crashes on port scan
Date Thu, 20 Dec 2018 14:48:00 GMT
Michael Patrick created THRIFT-4682:

             Summary: C++ TBinaryProtocol crashes on port scan
                 Key: THRIFT-4682
             Project: Thrift
          Issue Type: Bug
          Components: C++ - Library
    Affects Versions: 0.11.0, 0.10.0
            Reporter: Michael Patrick

I'm afraid I don't have the expertise or time to submit a formal Git pull request and test
cases, but I feel it's important for the Thrift community to be aware of a serious Denial
of Service (DOS) attack vulnerability involving TBinaryProtocol. 

A commercial port scanner application crashed all C++ Thrift server processes we had listening
for TBinaryProcol connections. Investigation showed it was due to an assert verifying the
initial packet length.  Crashing the server was as easy as sending an initial 4 bytes of
zeroes after the client opens the socket.  I'm attaching a "" script
that  will kill all C++ ThriftBinaryProtocol servers on an arbitrary IPv4 address within
a provided port range. The script can be used to verify the fix.   This problem  does not
occur in the  Python BinaryProtocol server;  I don't know about other languages.  The
problem is present in 0.10.0 and 0.11.0, and I don't know about earlier releases. 

 My recommended patch is to simply change the assert to a regular error check, as shown below. 
Index: lib/cpp/src/thrift/server/TNonblockingServer.cpp
--- lib/cpp/src/thrift/server/TNonblockingServer.cpp	(revision 75217)
+++ lib/cpp/src/thrift/server/TNonblockingServer.cpp	(working copy)
@@ -473,8 +473,13 @@

- // It is an error to be in this state if we already have all the data
- assert(readBufferPos_ < readWant_);
+ if (!(readBufferPos_ < readWant_)) {
+ GlobalOutput.printf("TNonblockingServer: frame size too short from client %s",
+ tSocket_->getSocketInfo().c_str());
+ close();
+ return;
+ }

try {
// Read from the socket{code}

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