Title

Attachments using generated name for secure temporary folders must be configured. (Cat II impact)

Discussion

The Secure Temporary Files folder is used to store attachments when they are opened in e-mail. By default, Outlook generates a random name for the Secure Temporary Files folder and saves it in the Temporary Internet Files folder. You can use this setting to designate a specific path and folder to use as the Secure Temporary Files folder. This configuration is not recommended, because it means that all users will have temporary Outlook files in the same predictable location, which is not as secure. If the name of this folder is well known, a malicious user or malicious code might target this location to try and gain access to attachments.

Check Content

The policy value for User Configuration -> Administrative Templates -> Microsoft Outlook 2010 -> Security -> Cryptography -> Signature Status dialog box "Attachment Secure Temporary Folder" must be set to "Disabled". Procedure: Use the Windows Registry Editor to navigate to the following key: HKCU\Software\Policies\Microsoft\Office\14.0\outlook\security\OutlookSecureTempFolder Criteria: If the registry key exists, this is a finding.

Fix Text

Set the policy value for User Configuration -> Administrative Templates -> Microsoft Outlook 2010 -> Security -> Cryptography -> Signature Status dialog box "Attachment Secure Temporary Folder" to "Disabled".

Additional Identifiers

Rule ID: SV-242081r961863_rule

Vulnerability ID: V-242081

Group Title: SRG-APP-000516

Expert Comments

CCIs tied to check.

Controls tied to check. These are derived from the CCIs shown above.