bugtraq - Hancom Office '.hml' file heap-based buffer overflow

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Message-Id: <201312170921.rBH9L0e7012142@sf01web3.securityfocus.com>
Date: Tue, 17 Dec 2013 09:21:00 GMT
From: diroverflow@...il.com
To: bugtraq@...urityfocus.com
Subject: Hancom Office '.hml' file heap-based buffer overflow

There is a vulnerability in Hancom Office 2010 SE, which can be exploited by malicious people to compromise a user's system.
'.hml' is a type of XML document files which is defined by Hancom. Contructing a long TEXTART tag will cause a heap-based buffer overflow. Such as:

<TEXTART Text="AAAAAAAA...(more than 500 bytes)" X0="0" X1="14173" X2="14173" X3="0" Y0="0" Y1="0" Y2="14173" Y3="14173">

Successful exploitation of the vulnerabilities may allow execution of arbitrary code.The vulnerabilities are confirmed in version 8.5.8. Other versions may also be affected.