Additional technical information is available regarding the Microsoft Publisher legacy file format parsing pointer dereference vulnerability.
Microsoft Office Publisher 2007 SP1 contains a vulnerability that could allow an unauthenticated, remote attacker to execute arbitrary code with the privileges of the user.
This vulnerability exists due to improper processing of malformed legacy file formats. An unauthenticated, remote attacker could exploit this vulnerability by convincing a user to view a malicious document. If the user opens the document, the attacker could execute code resulting in a complete system compromise.
Microsoft has confirmed this vulnerability in a security bulletin and released software updates that correct it.
Microsoft Office Publisher 2007 SP1 is vulnerable.
In order to exploit this vulnerability, an attacker relies upon user interaction. The attacker must convince the user to view a malicious document, likely provided as an attachment to a malicious e-mail message. The attacker may use social engineering techniques in an attempt to convince the user that the document comes from a trusted source.
If an exploit is successful, the attacker could execute arbitrary code with the privileges of the user. If that user holds privileges equivalent to the Administrator account, the attacker could execute code resulting in a complete compromise. Systems that restrict user privileges may have a lower impact as the result of an exploit, as any executed code would run with limited privileges.
Microsoft has released a security bulletin at the following link: MS09-030
An unauthenticated, remote attacker could exploit this vulnerability to execute arbitrary code with the privileges of the user. If that user holds elevated privileges, the attacker could take complete control of the system.
This vulnerability exists in the pubconv.dll module due to improper processing of malformed legacy file formats. The processing of a malicious file could trigger an attacker-controlled memory pointer dereference to a table of function pointers, corrupting memory. An unauthenticated, remote attacker could exploit this vulnerability by convincing a user to view a malicious document. When opened, the document could corrupt memory in such a way that could allow the attacker to execute arbitrary code with the privileges of the user.
Administrators are advised to apply the applicable software updates.
Users are advised not to open unsolicited e-mail attachments. Users should verify that attachments are safe before opening them.
Users are advised to run applications with the least necessary privileges.
Administrators may consider using a host-based intrusion prevention system to help mitigate the impact of an exploit.
Administrators may consider preventing access to the pubconv.dll component to prevent processing of legacy file types.
Microsoft customers can obtain updates directly by using the links in the security bulletin. These updates are also distributed by Windows automatic update features and available on the Windows Update website. Microsoft Windows Server Update Services (WSUS), Systems Management Server, and System Center Configuration Manager can assist administrators in deploying software updates.
Version 1, July 14, 2009, 2:42 PM: Microsoft Office Publisher contains a vulnerability that could allow an unauthenticated, remote attacker to execute arbitrary code with the privileges of the user. Updates are available.
The security vulnerability applies to the following combinations of products.
Microsoft Office Publisher
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