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微软 Jet数据库引擎 MDB 文件解析远程栈溢出漏洞

10-09-29 14:54 0 RSS 2.0

受影响系统：
Microsoft msjet40.dll 4.0.8618.0
Microsoft Access 2003
– Microsoft Windows XP SP2

描述：

BUGTRAQ ID: 26468

Microsoft Jet数据库是MS Office应用程序中广泛使用的轻型数据库。

Jet数据库在处理畸形MDB文件时存在缓冲区溢出漏洞，远程攻击者可能利用此漏洞通过诱使用户处理恶意文件，控制服务器。

Office Access在解析MDB文件时会调用Jet数据库引擎（msjet40.dll），如果解析了恶意的MDB文件就会在以下代码中触发栈溢出：

C:\Windows\System32\msjet40.dll，版本为4.0.8618.0

    .text:1B0B72BB                 mov     ecx, edx        ; ecx=0×5200
    .text:1B0B72BD                 mov     esi, edi        ; esi point
to the datas
    .text:1B0B72BF                 mov     ebp, ecx           ; which
can be find in the mdb file
    .text:1B0B72C1                 lea     edi, [esp+40h] ; edi point
to stack memory
    .text:1B0B72C5                 shr     ecx, 2
    .text:1B0B72C8                 rep movsd               ; stack overflow!!
    .text:1B0B72CA                 mov     ecx, ebp
    .text:1B0B72CC                 mov     eax, [eax+1]
    .text:1B0B72CF                 and     ecx, 3
    .text:1B0B72D2                 rep movsb

以下为调试信息：

    eax=05f5cb67 ebx=05e66458 ecx=00005200 edx=00005200 esi=05f5cd12
edi=0013db60
    eip=1b0b72c5 esp=0013db20 ebp=00005200 iopl=0         nv up ei pl
nz ac pe nc
    cs=001b ss=0023 ds=0023 es=0023 fs=003b gs=0000
efl=00000216
    msjet40!Ordinal55+0x23cd8:
    1b0b72c5 c1e902          shr     ecx,2
    0:000> u eip
    msjet40!Ordinal55+0x23cd8:
    1b0b72c5 c1e902          shr     ecx,2
    1b0b72c8 f3a5            rep movs dword ptr es:[edi],dword ptr [esi]
    1b0b72ca 8bcd            mov     ecx,ebp
    1b0b72cc 8b4001          mov     eax,dword ptr [eax+1]
    1b0b72cf 83e103          and     ecx,3
    1b0b72d2 f3a4            rep movs byte ptr es:[edi],byte ptr [esi]
    1b0b72d4 8bb424d4000000 mov     esi,dword ptr [esp+0D4h]
    1b0b72db 8b4b28          mov     ecx,dword ptr [ebx+28h]
    0:000> db esi
    05f5cd12 00 4f 00 53 00 7e 00 31-00 5c 00 56 00 42 00 41 .O.S.~.1.\.V.B.A
    05f5cd22 00 5c 00 56 00 42 00 41-00 36 00 5c 00 56 00 42 .\.V.B.A.6.\.V.B
    05f5cd32 00 45 00 36 00 2e 00 44-00 4c 00 4c 00 23 00 56 .E.6…D.L.L.#.V
    05f5cd42 00 69 00 73 00 75 00 61-00 6c 00 20 00 42 00 61 .i.s.u.a.l. .B.a
    05f5cd52 00 73 00 69 00 63 00 20-00 46 00 6f 00 72 00 20 .s.i.c. .F.o.r.
    05f5cd62 00 41 00 70 00 70 00 6c-00 69 00 63 00 61 00 74 .A.p.p.l.i.c.a.t
    05f5cd72 00 69 00 6f 00 6e 00 73-00 00 00 00 00 00 00 00 .i.o.n.s……..
    05f5cd82 00 00 00 00 00 12 01 2a-00 5c 00 47 00 7b 00 34 …….*.\.G.{.4
    0:000> db edi
    0013db60 09 00 00 00 01 00 00 00-18 00 00 00 9a 51 00 1b ………….Q..
    0013db70 86 ce 00 1b 00 c0 f5 05-02 00 00 00 e8 dc 13 00 …………….
    0013db80 22 7c 00 1b 0c 11 f4 05-e8 dc 13 00 c0 10 f4 05 “|…………..
    0013db90 3c cd 00 1b c0 10 f4 05-00 c0 f5 05 9c 78 e6 05 <…………x..
    0013dba0 e8 dc 13 00 05 10 92 7c-38 78 e6 05 eb cb 00 1b …….|8x……
    0013dbb0 80 9f a4 05 b0 98 a4 05-01 00 00 00 f2 cb 00 1b …………….
    0013dbc0 9c 78 e6 05 e8 dc 13 00-4c dc 13 00 4c dc 13 00 .x……L…L…
    0013dbd0 01 00 00 00 60 f3 00 1b-80 9f a4 05 02 00 00 00 ….`………..