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72 lines
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3.6 KiB
Text
72 lines
No EOL
3.6 KiB
Text
source: https://www.securityfocus.com/bid/58463/info
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QlikView is prone to a remote integer-overflow vulnerability.
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Successful attacks will allow attackers to execute arbitrary code within the context of the application. Failed exploit attempts will result in a denial-of-service condition.
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QlikView 11.00 SR2 is vulnerable; other versions may also be affected.
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Vulnerability details:
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----------------------
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The .qvw file is divided into several sections with a specified delimiter.
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Among others, there is a parameter which is responsible for defining the
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section length. On the hex listing below it's the DWORD A4 00 00 00 (address
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315EF)
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000315B0: 00 00 01 00-00 00 0E 23-23 23 23 23-23 23 23 23
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000315C0: 23 23 23 23-23 01 2E 00-00 00 00 00-00 00 00 00
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000315D0: 00 00 00 00-00 00 00 00-00 00 00 00-00 00 00 03
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000315E0: 00 00 00 00-00 00 00 90-02 00 00 00-00 04 00 A4
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000315F0: 00 00 00 78-9C 3D CC CB-4A 02 50 14-86 D1 1F 47
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If by any reasons the value is bigger than the actual size of the section,
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an error is handled by a C++ EH and a message "Document failed to load" is
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shown. The check condition can be seen here:
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.text:00D6BD66 mov eax, [edi+28h]
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.text:00D6BD69 mov ebx, [eax] ; here is the length parameter
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.text:00D6BD6B add eax, 4
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.text:00D6BD6E mov [edi+28h], eax
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.text:00D6BD71 cmp ebx, [ebp+var_14]
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.text:00D6BD74 jg loc_D6BBAC ; check if the parameter value
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is bigger than actual length
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However, the comparison operates with a signed number and doesn't check if it's
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less than zero. In other words, if an attacker supplies a DWORD bigger than
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0x80000000, the jump will not be taken (as the number will be considered as
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negative), causing an integer overflow. After that, the length parameter is used
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as the DstSize argument to the CArchive::Read function:
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.text:00D6BD7A mov eax, [ebp+Dst]
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.text:00D6BD7D push ebx ; DstSize
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.text:00D6BD7E push eax ; Dst
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.text:00D6BD7F mov ecx, edi
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.text:00D6BD81 call ?Read () CArchive@@QAEIPAXI () Z ; CArchive::Read(void *,uint)
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A large amount of data is read. It is used later to fill the created Archive
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whose size is 0x8000:
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.text:00B26207 push 0
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.text:00B26209 push 8000h
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.text:00B2620E push 1
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.text:00B26210 lea eax, [ebp+var_60]
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.text:00B26213 push eax
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.text:00B26214 lea ecx, [ebp+var_A8]
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.text:00B2621A call ??0CArchive@@QAE () PAVCFile@@IHPAX () Z ;
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CArchive::CArchive(CFile *,uint,int,void *)
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This results in the controlled address being overwritten with the controlled
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value.
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.text:009F3092 mov ecx, [esi]
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.text:009F3094 mov edx, [esi+4]
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.text:009F3097 mov [ecx+4], edx ; here the error occurs;
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.text:009F3097 ; trying to write at non-existing address
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An extract from a debugger with the occurence of the error is presented below.
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eax=04735f14 ebx=00000000 ecx=bbbbbbb7 edx=aaaaaaa6 esi=04b2fbc0 edi=04735f10
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eip=01723097 esp=003527f8 ebp=00352818 iopl=0 nv up ei pl nz ac pe nc
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cs=0023 ss=002b ds=002b es=002b fs=0053 gs=002b efl=00010216
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Qv+0x5f3097:
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01723097 895104 mov dword ptr [ecx+4],edx ds:002b:bbbbbbbb=???????? |