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From arshadmohammad <...@git.apache.org>
Subject [GitHub] zookeeper pull request #179: ZOOKEEPER-2693: DOS attack on wchp/wchc four le...
Date Fri, 17 Feb 2017 18:33:26 GMT
Github user arshadmohammad commented on a diff in the pull request:

    https://github.com/apache/zookeeper/pull/179#discussion_r101818292
  
    --- Diff: src/java/main/org/apache/zookeeper/server/NIOServerCnxn.java ---
    @@ -479,7 +479,7 @@ private boolean checkFourLetterWord(final SelectionKey k, final int
len)
             // We take advantage of the limited size of the length to look
             // for cmds. They are all 4-bytes which fits inside of an int
             String cmd = FourLetterCommands.getCmdMapView().get(len);
    -        if (cmd == null) {
    +        if (cmd == null || !FourLetterCommands.getWhiteListedCmdView().contains(cmd))
{
    --- End diff --
    
    if request is for 4lw command, it should be processed in that way only. If false is returned
from here, the request will proceed as the normal request.
    This is major issue in the current patch



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