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NRDAX-T0192 - Oversized Transaction Block-Fill

Memory amplification (also compute amplification) · Consensus ingest · mis-quantified bound · active · first seen 2024-01-01

provenance: Reproduced in NullRabbit's attack-reproduction pipeline

mechanism

CVE-2019-11636 (Zcash 'Sapling Wood-Chipper'): Zcash 2.x raised the max transaction size from 100 KB to the full block size after Sapling, letting an attacker cheaply build block-filling shielded txs (fee 0.0001 ZEC/tx; ~0.0576 ZEC/day fills all ~576 daily blocks) and flood them onto the P2P network so no real transaction can be mined - a Slowloris-style asymmetric DoS on the whole chain. Fixed by reverting the max-tx-size cap to 100 KB (~10-40x cost). Modelled here as the P2P tx/inv flood wire signature; per-tx shielded-output count scaled down for capture.

live exposure

No exposure data. Slashr ↗ has no risk signal mapped to this technique yet — absence of data is not absence of exposure.

instances (1)

chainprimitivefidelityoriginreproducer (bundle)source
zcash zcash_sapling_woodchip_tx_flood lab reverse-engineered-cve zcash_sapling_woodchip_tx_flood CVE-2019-11636 ↗

related (Memory amplification)

NRDAX-T0023 - Coalesced Packet Buffer Leak active NRDAX-T0025 - Compact Block Size Integer Overflow active NRDAX-T0038 - Count Underflow Header Serving Amplification active NRDAX-T0042 - Crypto Frame Reassembly Buffer Exhaustion active NRDAX-T0046 - Decompression Bomb Resource Exhaustion active NRDAX-T0059 - Duplicate Transport Parameter Memory Leak active NRDAX-T0061 - Duplicate Tx Mempool Index Desync active NRDAX-T0071 - Ethash Verification Memory Exhaustion active

cite

https://nrdax.com/techniques/NRDAX-T0192

plain

NRDAX Registry. Technique NRDAX-T0192.

bibtex
@misc{nrdax_NRDAX_T0192,
  title = {Oversized Transaction Block-Fill (NRDAX-T0192)},
  howpublished = {NRDAX Registry},
  url = {https://nrdax.com/techniques/NRDAX-T0192},
}
json (csl)
{
  "id": "nrdax-NRDAX-T0192",
  "type": "dataset",
  "title": "Oversized Transaction Block-Fill (NRDAX-T0192)",
  "URL": "https://nrdax.com/techniques/NRDAX-T0192",
  "publisher": "NRDAX Registry"
}
badge

NRDAX-T0192 in the NRDAX registry

[![NRDAX-T0192 in the NRDAX registry](https://nrdax.com/badge/NRDAX-T0192.svg)](https://nrdax.com/techniques/NRDAX-T0192-oversized-transaction-block-fill)

use from the CLI

Retrieve or cite this technique from a script or the terminal with the NRDAX Python library & CLI.

Retrieve this technique 
nrdax get NRDAX-T0192
Cite it (BibTeX) 
nrdax cite NRDAX-T0192 --format bibtex

CLI guide → GitHub ↗