High Risk Vulnerability in OpenOffice

John Heasman of NGSSoftware has discovered a high risk vulnerability
in the handling of StarCalc documents within OpenOffice.

The vulnerability affects all versions of OpenOffice prior to 2.2. If
an attacker can coax a user into opening a specially crafted StarCalc
document then the attacker can execute arbitrary code in the security
context of their victim.

Details

1) sc\source\filter\starcalc\scflt.cxx

USHORT NoteLen;
rStream >> NoteLen;
if (NoteLen != 0)
{
sal_Char Note[4096];
rStream.Read(Note, NoteLen);
Note[NoteLen] = 0;
String aText( SC10TOSTRING(Note));
ScPostIt aNote(aText, pDoc);
pDoc->SetNote(Col, static_cast<SCROW> (Row), Tab, aNote );
}

There is a stack overflow when copying more than 4096 characters into
the Note buffer.

Solution

This issue has now been resolved; OpenOffice users are strongly recommended
to install OpenOffice 2.2, apply OpenOffice patch 1.1.5 or obtain the
latest OpenOffice packages appropriate to their distribution.

Further information on this issue may be found at:

http://www.openoffice.org/security/CVE-2007-0238

NGSSoftware Insight Security Research
http://www.ngssoftware.com
http://www.databasesecurity.com/
http://www.nextgenss.com/
+44(0)208 401 0070

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