发布日期：2004-10-12
更新日期：2004-10-13

受影响系统：

Microsoft Internet Explorer 6.0SP1
Microsoft Internet Explorer 5.5SP2
Microsoft Internet Explorer 5.0.1SP4
Microsoft Internet Explorer 5.0.1SP3
Microsoft Internet Explorer 6.0
    - Microsoft Windows XP Professional
    - Microsoft Windows XP Home SP1
    - Microsoft Windows XP Home
    - Microsoft Windows XP
    - Microsoft Windows NT 4.0 SP6a
    - Microsoft Windows NT 4.0 SP6
    - Microsoft Windows ME
    - Microsoft Windows 2000 SP3

描述：

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BUGTRAQ  ID: 11366
CVE(CAN) ID: CVE-2004-0216

Microsoft Internet Explorer是一款流行的WEB浏览器。

Microsoft Internet Explorer的inseng.dll存在缓冲区溢出问题，远程攻击者可以利用这个漏洞以IE进程权限在系统上执行任意指令。

所有Microsoft windows包含Microsoft Active Setup/Install引擎组件，这些组件被标记安全并默认可从任何WEB页调用。

当调用由Active Setup控件ActiveX组件'asctrls.ocx'提供的SetCifFile()方法时，如果第一个参数(.cab文件名)字符串长度超过2kb，那么当计算缓冲区空间以允许拷贝'base url'时可发生整数溢出。

问题代码存在于Active Setup控件提供的安装引擎控件模块('inseng.dll')中，相关代码如下：

MOV EBX,DWORD PTR DS:[<&KERNEL32.lstrcpynA>]     ;  kernel32.lstrcpynA()

    ...

PUSH DWORD PTR SS:[EBP+C]                ; /String = Cab file name
AND BYTE PTR DS:[ESI],0                  ; |
CALL DWORD PTR DS:[<&KERNEL32.lstrlenA>] ; \lstrlenA()

MOV ECX,822        ; Max buffer size
SUB ECX,EAX        ; Calculate remaining buffer space - integer overflow!

PUSH ECX                  ; /n = Unchecked value - remaining buffer space!
PUSH DWORD PTR SS:[EBP-8] ; |String2 = BaseURL property value
PUSH ESI                  ; |String1 = 0x822 bytes heap buffer
CALL EBX                  ; \lstrcpynA()

MOV EDI,DWORD PTR DS:[<&KERNEL32.lstrcatA>] ;    kernel32.lstrcatA()
PUSH inseng.66561C84         ; /StringToAdd = "/"
PUSH ESI                     ; |ConcatString = Our heap buffer
CALL EDI                     ; \lstrcatA()

PUSH DWORD PTR SS:[EBP+C]    ; /StringToAdd = Our Cab file name
PUSH ESI                     ; |ConcatString = Our heap buffer
CALL EDI                     ; \lstrcatA()

<*来源：Peter Winter-Smith （peter4020@hotmail.com）
        Greg Jones
  
  链接：http://marc.theaimsgroup.com/?l=bugtraq&m=110616383332055&w=2
        http://www.microsoft.com/technet/security/bulletin/MS04-038.mspx
*>

建议：

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厂商补丁：

Microsoft
---------
Microsoft已经为此发布了一个安全公告（MS04-038）以及相应补丁:
MS04-038：Cumulative Security Update for Internet Explorer (834707)
链接：http://www.microsoft.com/technet/security/bulletin/MS04-038.mspx

补丁下载：

Internet Explorer 5.01 Service Pack 3 on Windows 2000 SP3

http://www.microsoft.com/downloads/details.aspx?FamilyId=2D8E8E97-4946-4994-924B-1FB1DC1881BA&displaylang=en

Internet Explorer 5.01 Service Pack 4 on Windows 2000 SP4

http://www.microsoft.com/downloads/details.aspx?FamilyId=72DBE239-AF0A-42B5-B88C-A00371F6EC81&displaylang=en

Internet Explorer 5.5 Service Pack 2 on Microsoft Windows Me

http://www.microsoft.com/downloads/details.aspx?FamilyId=BE27F77C-3C2D-45F1-86DF-2B71799DA169&displaylang=en

Internet Explorer 6 on Windows XP

http://www.microsoft.com/downloads/details.aspx?FamilyId=A89CFBE8-C299-415D-A9D6-7CC6429C547D&displaylang=en

Internet Explorer 6 Service Pack 1 on Microsoft Windows 2000 Service Pack 3, on Microsoft Windows 2000 Service Pack 4, on Microsoft Windows XP, or on Microsoft Windows XP Service Pack 1

http://www.microsoft.com/downloads/details.aspx?FamilyId=7C1404E6-F5D4-4FED-9573-DD83F2DFF074&displaylang=en

Internet Explorer 6 Service Pack 1 on Microsoft Windows NT Server 4.0 Service Pack 6a, on Microsoft Windows NT Server 4.0 Terminal Service Edition Service Pack 6, on Microsoft Windows 98, on Microsoft Windows 98 SE, or on Microsoft Windows Me

http://www.microsoft.com/downloads/details.aspx?FamilyId=DE8D94C4-7F58-4CE7-B8BD-51CFD795B03E&displaylang=en

Internet Explorer 6 for Windows XP Service Pack 1 (64-Bit Edition)

http://www.microsoft.com/downloads/details.aspx?FamilyId=C05103E8-4402-4D54-BA03-FBBC24142E4D&displaylang=en

Internet Explorer 6 for Windows Server 2003

http://www.microsoft.com/downloads/details.aspx?FamilyId=19E69E5F-9C98-49AD-A61F-4F82A4014412&displaylang=en

Internet Explorer 6 for Windows Server 2003 64-Bit Edition and Windows XP 64-Bit Edition Version 2003

http://www.microsoft.com/downloads/details.aspx?FamilyId=566C2A05-2513-4E30-A3EA-87D4BF7F9730&displaylang=en

Internet Explorer 6 for Windows XP Service Pack 2

http://www.microsoft.com/downloads/details.aspx?FamilyId=CF47B515-3F51-43E1-9246-2C2264C49E2E&displaylang=en

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