Date Discovered February 13, 2007
Description The Microsoft MFC component for Microsoft Windows and Microsoft Visual Studio .NET is prone to a remote code-execution vulnerability. This issue occurs when the application using the component attempts to parse malformed Rich Text Files (RTF).
An attacker could exploit this issue by enticing a victim to load a malicious RTF file. A successful exploit could result in the execution of arbitrary code in the context of the currently logged-in user.
Run all software as a nonprivileged user with minimal access rights. Ensure that all non-administrative tasks are performed as an unprivileged user with minimal access rights.
Deploy network intrusion detection systems to monitor network traffic for malicious activity. Deploy NIDS to monitor network traffic for signs of suspicious or anomalous activity. This may help detect malicious actions that an attacker may take after successfully exploiting vulnerabilities in applications. Review all applicable logs regularly.
Do not accept or execute files from untrusted or unknown sources. Users should never accept files from untrusted or
unknown sources, because they may be malicious in nature. Avoid opening email attachments from unknown or questionable sources.
Implement multiple redundant layers of security. Since this issue may be leveraged to execute code,
we recommend memory-protection schemes, such as non-executable stack/heap configurations and randomly mapped memory segments. This tactic may complicate exploits of memory-corruption vulnerabilities.
Evaluate options set for all applications.
Enable Embedded Object Blocking in WordPad. This mitigating strategy will temporarily block the parsing of embedded objects within Rich Text Files, reducing the chance of a successful exploit.
Microsoft has released a security advisory and patch to address this issue. Please see the references for more information.
UPDATE: Reportedly, the released patch did not completely fix this issue; Symantec has not verified the legitimacy of this claim. Please see the references for more information.
Credits Kostya Kortchinsky of Immunity, Inc. and Fabrice Desclaux from EADS Common Research Center are credited with the discovery of this vulnerability
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