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The mobile operating system must not cache smart card or certificate store passwords used by the VPN client for more than two hours.


Finding ID Version Rule ID IA Controls Severity
V-32697 WIR-MOS-iOS-034-06 SV-43043r1_rule ECWN-1 Medium
DoD data could be compromised if transmitted data is not secured with a compliant VPN. User authentication credentials (CAC PIN) may be compromised if a hacker credential cache is not wiped on a periodic basis.
Apple iOS 6 Security Technical Implementation Guide (STIG) 2013-05-23


Check Text ( C-41059r3_chk )
This check is not applicable if the installed VPN client is not used for remote access to DoD networks. Note: Use of a VPN to access DoD email on a mobile device is not required.
Interview the IAO and/or site wireless device administrator and inspect a sample (3-4) of site devices. Review VPN client specification sheets. Verify the VPN client is inactive session timeout has been set to 2 hours or less, if this parameter is configurable. If the specification sheets do not provide evidence of this capability, authenticate the VPN, wait two hours, and verify the system prompts the user for fresh credentials.

Mark as a finding if the timeout period is not set as required.
Fix Text (F-36595r2_fix)
Configure the VPN client to timeout an inactive session of 2 hours or less.