ITS ADVISORY NUMBER:
Vulnerabilities in Microsoft Exchange Server Could Allow Remote Code Execution (MS13-105)
Multiple vulnerabilities have been discovered in Microsoft Exchange Server that could allow remote code execution. Microsoft Exchange provides email, calendar, and contacts for corporate environments. Exploitation of these vulnerabilities could occur by an attacker sending an email message containing a specially content to an affected Exchange server. Successful exploitation could result in the attacker gaining the same user rights as the LocalService account or the logged on user. Depending on the privileges associated with the account, an attacker could then install programs; view, change, or delete data; or create new accounts with full user rights.
- Microsoft Exchange Server 2007
- Microsoft Exchange Server 2010
- Microsoft Exchange Server 2013
- Large and medium government entities: High
- Small government entities: High
- Large and medium business entities: High
- Small business entities: High
Home users: N/A
Multiple vulnerabilities have been discovered in Microsoft Exchange Server that could allow remote code execution. Two of the vulnerabilities exist in the WebReady Document Viewing feature. Two other vulnerabilities are caused by the Exchange Server not properly validating input. Exploitation of these vulnerabilities could be caused by an attacker sending specially crafted content to the Exchange Server or as an email attachment. Successful exploitation could result in the attacker gaining the same user rights as the LocalService account or the logged on user. Depending on the privileges associated with the account, an attacker could then install programs; view, change, or delete data; or create new accounts with full user rights.
We recommend the following actions be taken:
- Apply appropriate patches provided by Microsoft to vulnerable systems immediately after appropriate testing.
- Evaluate the relative need for WebReady Document viewing and disable if deemed non-essential.
- Run all software as a non-privileged user (one without administrative privileges) to diminish the effects of a successful attack.
- Remind users not to visit un-trusted websites or follow links provided by unknown or un-trusted sources.
Acting Chief Information Security Officer
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