Clock Rollback Security for Offline Access
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Solution Overview
Problem
Existing systems are vulnerable to clock rollback attacks, where a malicious user can alter the system clock to bypass temporal restrictions, allowing unauthorized access to resources by tricking the system into thinking it is an earlier date and time.
Innovation Solution
Implement a method where the system checks and records the system time upon inactivity and compares it with the current time upon reactivation, taking remedial actions such as reauthentication or updating policies if the clock has been rolled back, to prevent further use until trust is reestablished.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the system relies on local system clock for determining current date/time in offline mode, then the device can access resources without continuous network connection, but the system becomes vulnerable to clock rollback attacks allowing unauthorized access
Solution Approach 1:
The system performs preliminary actions by storing the system time when the application goes inactive and comparing it with the current time upon reactivation. This proactive time tracking prevents clock rollback attacks by detecting time changes before they can be exploited for unauthorized access.
Solution Approach 2:
The system implements feedback mechanisms by continuously monitoring system clock changes and triggering remedial actions (such as reauthentication or policy updates) when time rollback is detected. This closed-loop feedback ensures temporal restrictions remain enforceable even in offline mode.
2Ease of operation
If the system allows manual changing of system clock, then the device provides user flexibility for time zone changes and scheduling, but enables malicious users to bypass temporal restrictions and access restricted resources
Solution Approach 1:
The system applies preliminary anti-action by preemptively detecting and responding to clock rollback attempts before they can be used for unauthorized access. By storing baseline time values and comparing subsequent time readings, the system counteracts potential malicious clock manipulation while still allowing legitimate time adjustments.
3Reliability
If the system implements strict temporal restrictions to prevent unauthorized access, then security is improved, but legitimate users may be blocked when their devices experience legitimate time changes or synchronization issues
Solution Approach 1:
The system applies dynamics by making security enforcement adaptive rather than static. When clock rollback is detected, the system dynamically adjusts security measures (such as requiring reauthentication or updating policies from enterprise device management system) rather than immediately blocking all access. This dynamic response maintains security while accommodating legitimate time changes.
Data Source
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AI summary
Methods and systems for preventing clock rollback attacks are described herein. A rollback attack may occur when a user manually sets a system clock to a date/time earlier than the actual present day date and time, thereby tricking any software relying on the system clock to believe it is in fact the earlier date and time rather than the current date and time. According to aspects described herein, a particular application may check and store a record of the system time when an application goes inactive (or at intervals) and again when the application subsequently is activated again. When the application determines that the time has gone backward, the application (or system) may take some remedial measure(s) to prevent further use of the application (or system) until the user reestablishes trust (e.g., by re-authenticating or reestablishing a connection with a trusted time server).