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ZKsync Era (Immunefi) completed hunt — 0 findings after exhaustive 5-session audit. Use as a DEFENSE STUDY — learn what makes a protocol unhuntable, which patterns block all 10 bug classes, and when to abandon a target. Contains architecture breakdown, 25 tested attack vectors, a
ZKsync Era (Immunefi) completed hunt — 0 findings after exhaustive 5-session audit. Use as a DEFENSE STUDY — learn what makes a protocol unhuntable, which patterns block all 10 bug classes, and when to abandon a target. Contains architecture breakdown, 25 tested attack vectors, and pre-dive scoring refinements for large L1 bridge protocols.
Source documentation, not instructions for this website. Review permissions before running any commands.
Outcome: 0 submittable findings after 5+ sessions, 22+ agents, 25+ contracts, 25+ attack vectors Lesson: This file exists as a DEFENSE STUDY — what a hardened protocol looks like, and when to stop hunting.
| Field | Value |
|---|---|
| Protocol | ZKsync Era (L2 rollup) |
| Platform | Immunefi |
| TVL | $322M (L2BEAT Total Value Secured) |
| Bounty | $100K minimum Critical, $1.1M max |
| Codebase | 750K LOC (Solidity + Rust + Yul) |
| Audits | OpenZeppelin V29 (June 2025), multiple prior audits |
| Version | Protocol V29.4 |
| Repo | github.com/matter-labs/era-contracts |
| Primacy | Primacy of Impact — even out-of-scope assets qualify |
| Prior payouts | $50K (ChainLight ZK circuit bug) |
| Check | Result | Score |
|---|---|---|
| TVL > $500K | $322M | PASS |
| Max payout > $10K | $100K minimum | PASS |
| Simple protocol? | 750K LOC, L1↔L2 bridge + ZK + governance | PASS (complex) |
| < 500 lines? | 750K LOC | PASS |
| Audit quality | OpenZeppelin (top-tier) on ALL critical paths | WARNING |
REFINEMENT: Pre-dive should weight audit quality MORE for large protocols. A protocol passing TVL/LOC/payout checks can still be unhuntable if OZ/ToB audited the exact code you'd hunt. Add "audit firm tier" as a SOFT kill signal for 500K+ LOC protocols.
Bridgehub (router)
├── L1AssetRouter (token routing)
│ ├── L1Nullifier (deposit/withdrawal state)
│ └── L1NativeTokenVault (token custody)
├── ChainTypeManager (chain registration)
└── ValidatorTimelock (RBAC execution delay)
Bootloader (0x8001) → AccountCodeStorage, NonceHolder, KnownCodeStorage,
ImmutableSimulator, ContractDeployer, L1Messenger (0x8008),
MsgValueSimulator, L2BaseToken (0x800a), SystemContext (0x800b),
BootloaderUtilities, Compressor, ComplexUpgrader
Create2Factory, Bridgehub, AssetRouter, NativeTokenVault, MessageRoot
ZKChainStorage struct| # | Vector | Target | Why It Failed |
|---|---|---|---|
| 1 | UnsafeBytes offset miscalculation | L1Nullifier _parseL2WithdrawalMessage | All callers pre-validate message length before UnsafeBytes calls |
| 2 | Legacy/new boundary double-withdrawal | L1Nullifier | _isLegacyTxDataHash try/catch returns false on decode failure; encoding prefix discriminator prevents collision |
| 3 | secondBridgeAddress return value manipulation | Bridgehub requestL2TransactionTwoBridges | >0xFFFF check blocks system contracts; L2-side msg.sender auth makes crafted returns useless |
| 4 | Failed deposit claim wrong amount (legacy encoding) | L1Nullifier claimFailedDeposit | Legacy hash uses try/catch; depositHappened correctly tracks per-encoding-version |
| 5 | V29 interop root forgery | Executor | addChainBatchRoot requires onlyChain + onlyL2; historical roots verified via Merkle |
| 6 | Missing access control on sibling function | All bridge contracts | Every external function has appropriate modifier; checked all 50+ external functions |
| 7 | Fee-on-transfer token accounting desync | NativeTokenVault | L1ERC20Bridge: if (amount != _amount) revert TokensWithFeesNotSupported() |
| 8 | Governance timelock bypass | ValidatorTimelock | 5-role RBAC via AccessControlEnumerable; block.timestamp >= commitTimestamp + delay |
| # | Vector | Why It Failed |
|---|---|---|
| 9 | GatewayTransactionFilterer bypass | Era mainnet: transactionFilterer == address(0), not used |
| 10 | Precommitment sentinel collision | _revertBatches properly resets precommitment; sentinel values don't collide |
| 11 | L2→L1 message forgery via sendToL1 | Anyone can call sendToL1, but L1 verifies sender=0x8008 in log — can't forge system log sender |
| 12 | Compressor state diff manipulation | publishCompressedBytecode called only from bootloader context |
| 13 | Admin privilege escalation | Diamond proxy admin is governance; no facet can self-modify |
| 14 | Fee calculation overflow | All fee math uses SafeMath or checked arithmetic |
| 15 | Free L2 transaction abuse | reservedDynamic field properly handled; bootloader validates gas |
| 16 | DataEncoding L1/L2 mismatch | All 10 encode/decode pairs verified consistent across L1↔L2 |
| 17 | NTV token registration race | _ensureTokenRegistered is idempotent; double registration returns same assetId |
| 18 | Asset ID collision | keccak256(chainId, ntvAddress, tokenAddress) — no collision possible |
| 19 | Beacon proxy CREATE2 collision | Standard CREATE2; address determined by deployer+salt+bytecodeHash |
| 20 | Cross-contract reentrancy | Each contract has independent ReentrancyGuard AND follows CEI |
| 21 | Address aliasing collision | Bijective mapping (add/subtract offset mod 2^160) |
| 22 | Diamond proxy selector clash | Explicit selector mapping in DiamondCut; duplicates would revert |
| 23 | Priority tree manipulation | Merkle range proofs; unprocessedIndex only moves forward |
| 24 | Chain migration state corruption | forwardedBridgeMint validates consistency; atomic revert on mismatch |
// L1Nullifier._finalizeDeposit (line 411)
isWithdrawalFinalized[chainId][l2BatchNumber][l2MessageIndex] = true; // EFFECT first
// ... then external call to NTV
Every single withdrawal/claim/deposit path follows Check-Effect-Interact.
Each L2 system contract independently enforces access:
L2BaseToken.transferFromTo: checks msg.sender against 3 allowed callersL1Messenger.sendToL1: open to anyone, but L1 verifies sender field in logSystemContext: onlyCallFromBootloader on all state-changing functionsLEGACY_ENCODING_VERSION = 0x00 (first byte)
NEW_ENCODING_VERSION = 0x01 (first byte)
Different first byte = impossible to confuse one format for another.
Three bridge generations coexist cleanly:
Each boundary has explicit version checks, try/catch decoding, and fallback paths.
V29 OZ audit found 3 HIGHs. All fixes were thorough — not just patches but architectural improvements. The "least audited code" assumption (that fixes are hastily applied) did NOT hold here.
era-contracts releasesEvmGasManager, EVM opcode compatibility gapsL2InteropRootStorage is minimal now, but interop = massive new surfaceAdd to the scorecard:
SOFT KILL: If protocol has OZ/ToB/Cyfrin audit on current version AND codebase > 500K LOC
→ expect 40+ hours for MAYBE 1 finding
→ only proceed if bounty floor > $50K AND you have protocol-specific expertise
NEXT: 08-ai-tools.md
name: web3-hunt-zksync-era description: ZKsync Era (Immunefi) completed hunt — 0 findings after exhaustive 5-session audit. Use as a DEFENSE STUDY — learn what makes a protocol unhuntable, which patterns block all 10 bug classes, and when to abandon a target. Contains architecture breakdown, 25 tested attack vectors, and pre-dive scoring refinements for large L1 bridge protocols.
---
name: web3-hunt-zksync-era
description: ZKsync Era (Immunefi) completed hunt — 0 findings after exhaustive 5-session audit. Use as a DEFENSE STUDY — learn what makes a protocol unhuntable, which patterns block all 10 bug classes, and when to abandon a target. Contains architecture breakdown, 25 tested attack vectors, and pre-dive scoring refinements for large L1 bridge protocols.
---
# LIVE HUNT: ZKsync Era (Immunefi) — COMPLETED, 0 FINDINGS
> **Outcome**: 0 submittable findings after 5+ sessions, 22+ agents, 25+ contracts, 25+ attack vectors
> **Lesson**: This file exists as a DEFENSE STUDY — what a hardened protocol looks like, and when to stop hunting.
---
## TARGET PROFILE
| Field | Value |
|-------|-------|
| Protocol | ZKsync Era (L2 rollup) |
| Platform | Immunefi |
| TVL | $322M (L2BEAT Total Value Secured) |
| Bounty | $100K minimum Critical, $1.1M max |
| Codebase | 750K LOC (Solidity + Rust + Yul) |
| Audits | OpenZeppelin V29 (June 2025), multiple prior audits |
| Version | Protocol V29.4 |
| Repo | `github.com/matter-labs/era-contracts` |
| Primacy | Primacy of Impact — even out-of-scope assets qualify |
| Prior payouts | $50K (ChainLight ZK circuit bug) |
### Pre-Dive Scorecard
| Check | Result | Score |
|-------|--------|-------|
| TVL > $500K | $322M | PASS |
| Max payout > $10K | $100K minimum | PASS |
| Simple protocol? | 750K LOC, L1↔L2 bridge + ZK + governance | PASS (complex) |
| < 500 lines? | 750K LOC | PASS |
| **Audit quality** | OpenZeppelin (top-tier) on ALL critical paths | **WARNING** |
> **REFINEMENT**: Pre-dive should weight audit quality MORE for large protocols.
> A protocol passing TVL/LOC/payout checks can still be unhuntable if OZ/ToB audited the exact code you'd hunt.
> Add "audit firm tier" as a SOFT kill signal for 500K+ LOC protocols.
---
## ARCHITECTURE (What Makes It Hardened)
### L1 Bridge Stack
```
Bridgehub (router)
├── L1AssetRouter (token routing)
│ ├── L1Nullifier (deposit/withdrawal state)
│ └── L1NativeTokenVault (token custody)
├── ChainTypeManager (chain registration)
└── ValidatorTimelock (RBAC execution delay)
```
### L2 System Contracts (kernel space 0x8000-0xFFFF)
```
Bootloader (0x8001) → AccountCodeStorage, NonceHolder, KnownCodeStorage,
ImmutableSimulator, ContractDeployer, L1Messenger (0x8008),
MsgValueSimulator, L2BaseToken (0x800a), SystemContext (0x800b),
BootloaderUtilities, Compressor, ComplexUpgrader
```
### L2 User Space Contracts (0x10000+)
```
Create2Factory, Bridgehub, AssetRouter, NativeTokenVault, MessageRoot
```
### Diamond Proxy Pattern (EIP-2535)
- All facets (Admin, Executor, Mailbox, Getters) share single `ZKChainStorage` struct
- No storage collision possible between facets
- Function selectors explicitly mapped in DiamondCut
---
## ALL 25 ATTACK VECTORS TESTED
### Critical Path (Vectors 1-8)
| # | Vector | Target | Why It Failed |
|---|--------|--------|---------------|
| 1 | UnsafeBytes offset miscalculation | L1Nullifier `_parseL2WithdrawalMessage` | All callers pre-validate message length before UnsafeBytes calls |
| 2 | Legacy/new boundary double-withdrawal | L1Nullifier | `_isLegacyTxDataHash` try/catch returns false on decode failure; encoding prefix discriminator prevents collision |
| 3 | `secondBridgeAddress` return value manipulation | Bridgehub `requestL2TransactionTwoBridges` | `>0xFFFF` check blocks system contracts; L2-side `msg.sender` auth makes crafted returns useless |
| 4 | Failed deposit claim wrong amount (legacy encoding) | L1Nullifier `claimFailedDeposit` | Legacy hash uses try/catch; `depositHappened` correctly tracks per-encoding-version |
| 5 | V29 interop root forgery | Executor | `addChainBatchRoot` requires `onlyChain + onlyL2`; historical roots verified via Merkle |
| 6 | Missing access control on sibling function | All bridge contracts | Every external function has appropriate modifier; checked all 50+ external functions |
| 7 | Fee-on-transfer token accounting desync | NativeTokenVault | L1ERC20Bridge: `if (amount != _amount) revert TokensWithFeesNotSupported()` |
| 8 | Governance timelock bypass | ValidatorTimelock | 5-role RBAC via AccessControlEnumerable; `block.timestamp >= commitTimestamp + delay` |
### Extended Surface (Vectors 9-25)
| # | Vector | Why It Failed |
|---|--------|---------------|
| 9 | GatewayTransactionFilterer bypass | Era mainnet: `transactionFilterer == address(0)`, not used |
| 10 | Precommitment sentinel collision | `_revertBatches` properly resets precommitment; sentinel values don't collide |
| 11 | L2→L1 message forgery via `sendToL1` | Anyone can call `sendToL1`, but L1 verifies `sender=0x8008` in log — can't forge system log sender |
| 12 | Compressor state diff manipulation | `publishCompressedBytecode` called only from bootloader context |
| 13 | Admin privilege escalation | Diamond proxy admin is governance; no facet can self-modify |
| 14 | Fee calculation overflow | All fee math uses SafeMath or checked arithmetic |
| 15 | Free L2 transaction abuse | `reservedDynamic` field properly handled; bootloader validates gas |
| 16 | DataEncoding L1/L2 mismatch | All 10 encode/decode pairs verified consistent across L1↔L2 |
| 17 | NTV token registration race | `_ensureTokenRegistered` is idempotent; double registration returns same assetId |
| 18 | Asset ID collision | `keccak256(chainId, ntvAddress, tokenAddress)` — no collision possible |
| 19 | Beacon proxy CREATE2 collision | Standard CREATE2; address determined by deployer+salt+bytecodeHash |
| 20 | Cross-contract reentrancy | Each contract has independent ReentrancyGuard AND follows CEI |
| 21 | Address aliasing collision | Bijective mapping (add/subtract offset mod 2^160) |
| 22 | Diamond proxy selector clash | Explicit selector mapping in DiamondCut; duplicates would revert |
| 23 | Priority tree manipulation | Merkle range proofs; `unprocessedIndex` only moves forward |
| 24 | Chain migration state corruption | `forwardedBridgeMint` validates consistency; atomic revert on mismatch |
| 25 | Cross-chain message replay | `isWithdrawalFinalized[chainId][batch][index]` prevents replay |
---
## WHY THIS PROTOCOL IS UNHUNTABLE (Solidity Surface)
### Defense Pattern 1: CEI Everywhere
```solidity
// L1Nullifier._finalizeDeposit (line 411)
isWithdrawalFinalized[chainId][l2BatchNumber][l2MessageIndex] = true; // EFFECT first
// ... then external call to NTV
```
Every single withdrawal/claim/deposit path follows Check-Effect-Interact.
### Defense Pattern 2: Independent Access Control on L2
Each L2 system contract independently enforces access:
- `L2BaseToken.transferFromTo`: checks `msg.sender` against 3 allowed callers
- `L1Messenger.sendToL1`: open to anyone, but L1 verifies sender field in log
- `SystemContext`: `onlyCallFromBootloader` on all state-changing functions
- No single RBAC failure cascades
### Defense Pattern 3: Encoding Collision Resistance
```
LEGACY_ENCODING_VERSION = 0x00 (first byte)
NEW_ENCODING_VERSION = 0x01 (first byte)
```
Different first byte = impossible to confuse one format for another.
### Defense Pattern 4: Mature Legacy Boundary Handling
Three bridge generations coexist cleanly:
1. L1ERC20Bridge (legacy wrapper → delegates to AssetRouter)
2. L1SharedBridge (previous → absorbed into AssetRouter/Nullifier)
3. L1AssetRouter + L1Nullifier (current)
Each boundary has explicit version checks, try/catch decoding, and fallback paths.
### Defense Pattern 5: Audit Fix Quality
V29 OZ audit found 3 HIGHs. All fixes were thorough — not just patches but architectural improvements.
The "least audited code" assumption (that fixes are hastily applied) did NOT hold here.
---
## STRATEGIC TAKEAWAYS
### When to Abandon a Large L1 Bridge Target
1. After systematically testing top 8 attack vectors (Days 1-2): if all blocked, ROI drops exponentially
2. If OZ/ToB audited the EXACT codebase version you're reviewing (not an older version)
3. If 22+ automated agents all return clean across all contracts
4. If encoding, access control, and CEI are all consistently applied with zero exceptions
### What Could Still Work on ZKsync
1. **ZK circuits** (Rust/RISC-V) — different skillset, different attack surface, prior $50K payout proves bugs exist there
2. **Bootloader assembly** (Yul) — 5000+ lines of hand-written Yul, complex gas accounting, less audited
3. **New code drops** (V30+) — fresh code = fresh bugs. Monitor `era-contracts` releases
4. **EVM emulation edge cases** — `EvmGasManager`, EVM opcode compatibility gaps
5. **Interop protocol** (when launched) — `L2InteropRootStorage` is minimal now, but interop = massive new surface
### Pre-Dive Scoring Refinement
Add to the scorecard:
```
SOFT KILL: If protocol has OZ/ToB/Cyfrin audit on current version AND codebase > 500K LOC
→ expect 40+ hours for MAYBE 1 finding
→ only proceed if bounty floor > $50K AND you have protocol-specific expertise
```
---
> NEXT: [08-ai-tools.md](08-ai-tools.md)
Skill source recorded
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Review before install: Avoid automatic install
Listed tools are metadata hints, not tested compatibility. Agent prompts are suggested handoffs.
Check the source for dependencies, API keys and third-party costs. A public repository does not mean every service is free.
Repository metadata and review signals are advisory. Popularity, source discovery and successful execution are different facts.
Version reported in registry metadata; check source releases before relying on it.
Quality
68/100
Promising
Trust
67/100
Sandbox only
Audit
79/100
Risky
This page exposes the same decision, trust, audit, use-case, and install signals through the Registry API, so agents can rank this skill without scraping the UI.
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},
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"tier": "blocked",
"label": "Blocked for auto-install",
"auto_install_policy": "block",
"auto_install_allowed": false,
"human_review_required": true,
"blocked": true,
"recommended_action": "Do not auto-install. Inspect the source, dependencies, and permission surface first."
},
"quality": {
"score": 68,
"label": "Promising"
},
"supply": {
"track": "Coding and developer agents",
"scenario": "Testing and QA",
"maintenance": "17d since push",
"risk": "Risky"
},
"alternative_skills": [],
"do_not_use_when": [
"teams that need a vendor-supported SLA",
"high-compliance environments without internal security review",
"No OpenAgentSkill engagement data yet",
"Audit risk risky exceeds max_risk=medium",
"High-risk permission hints: Secrets or environment access",
"Permission surface may require sandboxing",
"Potential broker, wallet, exchange, or real-money execution surface; sandbox and explicit approval are required",
"This skill may touch real-money trading, broker, wallet, or exchange operations; use only in a sandbox with explicit approval."
],
"agent_contract": {
"task_input": "Use web3-hunt-zksync-era in an agent workflow",
"recommended_action": "Do not auto-install. Inspect the source, dependencies, and permission surface first.",
"install_policy": "block",
"minimum_review_before_use": [
"Trust: 75/100 Strong shortlist",
"Audit: 79/100 Risky",
"Safety: 47/100 Avoid automatic install",
"Review repository, license, install command, and permission surface before production use."
],
"expected_agent_output": {
"selected_skill": "awarexone-web3-hunt-zksync-era (web3-hunt-zksync-era)",
"install_command": "npx skills add Awarexone/web3-bug-bounty-hunting-ai-skills --skill web3-hunt-zksync-era",
"risk_summary": "Risky; Blocked for auto-install; Review before production",
"verification_result": "Report the smallest successful task, files touched, warnings, and any missing setup."
}
},
"outcome_feedback": {
"endpoint": "https://www.openagentskill.com/api/agent/outcome",
"method": "POST",
"requires_resolve_event_id": true,
"event_id_source": "Use install_receipt.outcome_feedback.event_id or feedback.event_id returned by /api/agent/resolve for the current task.",
"expected_outcomes": [
"success",
"failed",
"not_relevant",
"blocked_by_risk",
"setup_required"
],
"payload_template": {
"event_id": "<install_receipt.outcome_feedback.event_id or feedback.event_id from /api/agent/resolve>",
"skill_slug": "awarexone-web3-hunt-zksync-era",
"task": "Use web3-hunt-zksync-era in an agent workflow",
"agent": "codex",
"outcome": "success",
"install_used": true,
"risk_blocked": false,
"setup_required": false,
"task_success": true,
"output_quality": 4,
"error_type": null,
"human_review_required": false,
"workspace": "sandbox",
"time_to_useful_ms": 120000,
"notes": "Report the smallest successful task, setup friction, files touched, and risk notes."
}
},
"endpoints": {
"web": "https://www.openagentskill.com/skills/awarexone-web3-hunt-zksync-era",
"api": "https://www.openagentskill.com/api/agent/skills/awarexone-web3-hunt-zksync-era",
"audit": "https://www.openagentskill.com/skills/awarexone-web3-hunt-zksync-era/audit",
"eval": "https://www.openagentskill.com/api/agent/evals?slug=awarexone-web3-hunt-zksync-era&task=Use%20web3-hunt-zksync-era%20in%20an%20agent%20workflow&max_risk=medium",
"resolve": "https://www.openagentskill.com/api/agent/resolve?task=Use%20web3-hunt-zksync-era%20in%20an%20agent%20workflow&agent=codex&max_risk=medium",
"receipt": "https://www.openagentskill.com/api/agent/receipt?task=Use%20web3-hunt-zksync-era%20in%20an%20agent%20workflow&agent=codex&max_risk=medium&format=text",
"install": "https://www.openagentskill.com/api/skills/awarexone-web3-hunt-zksync-era/install",
"manifest": "https://www.openagentskill.com/api/registry/manifest/awarexone-web3-hunt-zksync-era"
}
}Listing source
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[](https://www.openagentskill.com/skills/awarexone-web3-hunt-zksync-era/audit)
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| 25 | Cross-chain message replay | isWithdrawalFinalized[chainId][batch][index] prevents replay |
Copies are not installs. Installation counts require a reported successful installation; they are not a blanket quality guarantee.