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"Sniff attacks" - xmlrpc.php , horde

Discussion in 'General Discussion' started by GTFO, May 17, 2006.

  1. GTFO

    GTFO Active Member

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    I've this problem on a few of my cpanel servers where they are continually being sniffed for exploits from various IP's. They do it enough to cause noticeable load hikes, and we resort to finding their IP's in apache status, and blocking them. When this is occuring, for a long time, they seemed to favor sniffing all the domains in apache on a server looking for xmlrpc.php. Their sniff tacticts have since expanded to "horde3//README" and various other URLs.

    I've read that xmlrpc.php was once an exploitable file on older versions including various renditions of wordpress (which some of our clients use) . Finding the IP's and blocking them in apf temporarily solves the problem, but they do not come from a similar range so we've not found a permanent solution to this.

    Does anyone have any suggestions on how to tackle tihs problem ?
     
    #1 GTFO, May 17, 2006
  2. AndyReed

    AndyReed Well-Known Member
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    Use Mod Security rule set written for XML. They should block/stop these attacks.
     
    #2 AndyReed, May 17, 2006
  3. ramprage

    ramprage Well-Known Member

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    If you can give me a sample of what the requests look like I can write a rule for it.
     
    #3 ramprage, May 18, 2006
  4. GTFO

    GTFO Active Member

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    Do you have more information about this? We have Mod security running, yet I am unsure which rule set or perhaps, what variable you are referring too. Can you recommend a place for documentation?
     
    #4 GTFO, May 19, 2006
  5. GTFO

    GTFO Active Member

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    I'll grab a few from the next wave and post them.
     
    #5 GTFO, May 19, 2006
  6. mctDarren

    mctDarren Well-Known Member

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    Check out gotroot.com for some great mod_sec rules. Examples that apply here:

    Code:
    #Experimental XML-RPC generic attack sigs
SecFilter "\'\,\'\'\)\)\;"
SecFilter "\<param\>\<name\>.*\'\)\;"

#XML-RPC generic attack sigs
SecFilterSelective POST_PAYLOAD "^Content-Type\: application/xml" chain
SecFilter "(\<xml|\<.*xml)" chain
SecFilter "(echo( |\(|\').*\;|chr|fwrite|fopen|system|echr|passthru|popen|proc_open|shell_exec|exec|proc_nice|proc_terminate$
SecFilter "methodCall\>"

#Specific XML-RPC attacks on xmlrpc.php
SecFilterSelective THE_REQUEST "(/xmlrpc|.*xmlrpc_services)\.php" chain
SecFilter "(\<xml|\<.*xml)" chain
SecFilter "(echo( |\(|\').*\;|chr|fwrite|fopen|system|echr|passthru|popen|proc_open|shell_exec|exec|proc_nice|proc_terminate$

#Too generic, unless you know you won't see this in any of the fields of an XMLRPC message on your system
SecFilterSelective THE_REQUEST "/xmlrpc\.php" chain
SecFilter "(cd|perl |python |rpm |yum |apt-get |emerge |lynx |links |mkdir |elinks |cmd|pwd|wget |id|uname |cvs |svn |(s|r)$

#XML-RPC SQL injection generic signature
SecFilterSelective THE_REQUEST "(/xmlrpc|.*xmlrpc_services)\.php" chain
SecFilter "<methodName>.*</methodName>.*<value><string>.*(select|grant|delete|insert|drop|do|alter|replace|truncate|update|c$
     
    #6 mctDarren, May 19, 2006
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