Microsoft Excel is prone to a remote code-execution vulnerability. Attackers can exploit this issue to execute arbitrary code with the privileges of the user running the application, which can result in the compromise of affected computers.
Run all software as a nonprivileged user with minimal access rights.
To reduce the impact of latent vulnerabilities, always run non-administrative software as an unprivileged user with minimal access rights.
Do not accept or execute files from untrusted or unknown sources.
Users should not accept or execute files from unknown or untrusted sources.
Microsoft has released a fix to address this issue. Please see the references section for more information. Update: Microsoft has re-released MS07-002 to resolve a regression with the original Excel 2000 fixes when dealing with files created when in Korean, Chinese, or Japanese executable modes. Please see the knowledge base article (KB931183) for further information.