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NGS-openoffice.txt

NGS-openoffice.txt
Posted Apr 5, 2007
Authored by John Heasman | Site ngssoftware.com

A stack overflow affects all versions of OpenOffice prior to 2.2. The flaw exists in the handling of StarCalc documents within OpenOffice.

tags | advisory, overflow
SHA-256 | c06dc4d6cb7f25d0c27d7c5763173af7931fb5c54fce6b66c583a2a8e0cb583d

NGS-openoffice.txt

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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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