Submission Details
Severity:
Permanent Session Lock Due to Missing Session End Function
Summary
Once a session starts, there's no way to end it, permanently locking the contract state.
Vulnerability Details
Root cause:
function startSession(uint256 _cutOffScore) public onlyPrincipal notYetInSession {
inSession = true; // Can never be set back to false
}
Initial State:
Session not started (inSession = false)
Contract functions normally
Step 1: Principal starts session
Step 2: inSession set to true permanently
Step 3: Contract becomes partially locked
Implications:
No new sessions possible
Contract functionality limited
System becomes unusable
Impact
Contract becomes permanently locked
New students can't enroll
System requires redeployment
Tools Used
Manual Review
Recommendations
Add session end functionality:
function endSession() public onlyPrincipal {
require(block.timestamp >= sessionEnd, "Session still active");
require(inSession, "No active session");
inSession = false;
emit SessionEnded(block.timestamp);
}
Updates
Lead Judging Commences
yeahchibyke about 2 months ago
Submission Judgement Published Assigned finding tags:
session state not updated
`inSession` not updated after during upgrade
Rewards breakdown
nSLOC
243This contest has a flat reward structure with the following payouts:
100 EXP
20 EXP
2 EXP
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