The Mainframe Product must conceal, via the session lock, information previously visible on the display with a publicly viewable image.

From Mainframe Product Security Requirements Guide

Associated with: CCI-000060

SV-82599r1_rule The Mainframe Product must conceal, via the session lock, information previously visible on the display with a publicly viewable image.

Vulnerability discussion

A session time-out lock is a temporary action taken when a user stops work and moves away from the immediate physical vicinity of the information system, but does not log out because of the temporary nature of the absence. The session lock is implemented at the point where session activity can be determined. This is typically at the operating system-level, but may be at the application-level. When the application design specifies the application rather than the operating system will determine when to lock the session, the application session lock event must include an obfuscation of the display screen so as to prevent other users from reading what was previously displayed. Publicly viewable images can include static or dynamic images, for example, patterns used with screen savers, photographic images, solid colors, a clock, a battery life indicator, or a blank screen, with the additional caveat that none of the images convey sensitive information.

Check content

If the Mainframe Product has no data screen capability, this requirement is not applicable. Examine configuration parameters to determine whether information previously displayed on the screen is concealed at a session lock. If information is not concealed, this is a finding.

Fix text

Configure the Mainframe Product to conceal previously displayed information at a session lock.

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