受影响系统：
Foxit Foxit Reader
描述：
BUGTRAQ ID: 55734
Foxit Reader是一款小型的PDF文档查看器和打印程序。
Foxit Reader 5.4.3.0920及其他版本处理PDF文档时存在拒绝服务漏洞，可允许远程攻击者使受影响应用崩溃。
<*来源：coolkaveh
*>
测试方法：
警 告
以下程序(方法)可能带有攻击性，仅供安全研究与教学之用。使用者风险自负！
Title : Foxit Reader suffers from Division By Zero
Version : 5.4.3.0920
Date : 2012-09-28
Vendor : http://www.foxitsoftware.com/
Impact : Med/High
Contact : coolkaveh [at] rocketmail.com
Twitter : @coolkaveh
tested : XP SP3
#####################################################################
Bug :
—-
division by zero vulnerability during the handling of the pdf files.
that will trigger a denial of service condition
#####################################################################
(b34.f24): Integer divide-by-zero – code c0000094 (first chance)
First chance exceptions are reported before any exception handling.
This exception may be expected and handled.
eax=ffffffff
ebx=00000000
ecx=00000000
edx=00000000
esi=00000000
edi=00000000
eip=00558c8c
esp=0012f928
ebp=00000000
iopl=0 nv up ei pl zr na pe nc
cs=001b ss=0023 ds=0023 es=0023 fs=003b gs=0000 efl=00010246
*** ERROR: Module load completed but symbols could not be loaded for FoxitReader_Lib_Full.exe
FoxitReader_Lib_Full+0x158c8c:
00558c8c f7f7 div eax,edi
0:000> r;!exploitable -v;q
eax=ffffffff
ebx=00000000
ecx=00000000
edx=00000000
esi=00000000
edi=00000000
eip=00558c8c
esp=0012f928
ebp=00000000 iopl=0 nv up ei pl zr na pe nc
cs=001b ss=0023 ds=0023 es=0023 fs=003b gs=0000 efl=00010246
FoxitReader_Lib_Full+0x158c8c:
00558c8c f7f7 div eax,edi
HostMachine\HostUser
Executing Processor Architecture is x86
Debuggee is in User Mode
Debuggee is a live user mode debugging session on the local machine
Event Type: Exception
*** ERROR: Symbol file could not be found. Defaulted to export symbols for ntdll.dll –
Exception Faulting Address: 0x558c8c
First Chance Exception Type: STATUS_INTEGER_DIVIDE_BY_ZERO (0xC0000094)
Faulting Instruction:00558c8c div eax,edi
Basic Block:
00558c8c div eax,edi
Tainted Input Operands: ax, dx, eax, edi
00558c8e cmp dword ptr [esp+3ch],eax
Tainted Input Operands: eax
00558c92 jae foxitreader_lib_full+0x158f06 (00558f06)
Tainted Input Operands: CarryFlag
Exception Hash (Major/Minor): 0x6461647c.0x64616453
Stack Trace:
FoxitReader_Lib_Full+0x158c8c
Instruction Address: 0x0000000000558c8c
Description: Integer Divide By Zero
Short Description: DivideByZero
Recommended Bug Title: Integer Divide By Zero starting at FoxitReader_Lib_Full+0x0000000000158c8c (Hash=0x6461647c.0x64616453)
#####################################################################
Proof of concept .pdf included: http://www.exploit-db.com/sploits/21645.pdf
建议：
厂商补丁：
Foxit
—–
目前厂商还没有提供补丁或者升级程序，我们建议使用此软件的用户随时关注厂商的主页以获取最新版本：
评论关闭。