This issue occurs due to the presence of Cisco bug ID CSCsg02749.
For a workaround:
Download and install the upgrade package csmars-188.8.131.523.pkg in which the bug is fixed.
Note: Before you upgrade, read the upgrade instructions. Refer to the Upgrade Instructions section of Quick Install and Release Notes for Cisco Security MARS Appliance 4.2.3 for more information.
Open a case with Cisco Technical Support with the TAC Service Request Tool if this issue still exists.