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Microsoft GDI+ Integer Division by Zero Flaw Handling .ICO Files
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SUMMARY
CSIS Security Group has discovered an Integer division by zero flaw in the
GDI+ component in Windows XP. This condition are activated when a
malformed ICO file are viewed through either Windows Explorer or other
components like Windows Picture and Fax Viewer .
The consequence of this flaw is a Denial of Service condition and doing a
restart of the explorer process
DETAILS
Vulnerable Systems:
* Windows XP Service Pack 2
CSIS Security Group has discovered an Integer division by zero flaw in the
GDI+ component in Windows XP. This condition are activated when a
malformed ICO file are viewed through either Windows Explorer or other
components like Windows Picture and Fax Viewer .
The consequence of this flaw is a Denial of Service condition, to
applications using the vulnerable GDI+ component, and doing a restart of
the explorer process. The flaw is in the InfoHeader -> Height value within
the malformed .ICO file, when inserting 0x00000000 at byte location 31 to
34.
Disassembly of the code:
The flaw goes into the following memory area and throws the exception
Integer division by zero at 4ED9E28F, Causing a restart of the explorer
process.
Below is the vulnerable function:
text:4ED9E209 ; private: int __thiscall GpIcoCodec::IsValidDIB(unsigned
int)
text:4ED9E209 ?IsValidDIB@GpIcoCodec@@AAEHI@Z proc near
text:4ED9E209 ; CODE XREF: GpIcoCodec::ReadHeaders(void)+188p
Integer division by Zero
4ED9E28A mov eax,7FFFF000h ; 7FFFF000h = 2147479552
4ED9E28F div eax,edi ; 2147479552 / 0
Analysis:
Exploitation of the flaw will at least result in a Denial of Service
condition against the program using the GDI+ component, and doing a
restart of the explorer process. Further code execution has not been
verified.
Timeline of public disclosure
02-04-2007 Vulnerability discovered.
17-04-2007 Research ended.
18-04-2007 CERT/CC informed
18-04-2007 Received VU#290961 from CERT/CC
25-04-2007 Received CVE-2007-2237 from CERT/CC
03-05-2007 Reported to Microsoft MSRC (secure@microsoft.com)
03-05-2007 Received response from MSRC (Case: 7402)
31-05-2007 Received response from MSRC Flaw will be fixed in next Service
Pack
31-05-2007 Information released on CSIS Platinum mailing list
06-06-2007 Public release
CVE Information:
<http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-2237>
CVE-2007-2237
ADDITIONAL INFORMATION
The information has been provided by <mailto:rand@csis.dk> Dennis Rand.
The original article can be found at:
<http://www.csis.dk/dk/forside/GdiPlus.pdf>
http://www.csis.dk/dk/forside/GdiPlus.pdf
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