Dep Group Remote Memory Exhaustion (Denial of Service) in ckb

Impact

A remote attacker could exploit this vulnerability to exhaust ckb process memory of an affected node.

Patches

Upgrade to 0.43.1 or later.

References

After resolving the outpoints of one dep group, we put the corresponding content into a vec ( https://github.com/nervosnetwork/ckb/blob/v0.42.0/util/types/src/core/cell.rs#L600-L617 ), there is a vulnerability to a memory dos attack because there is no determination of whether the outpoints is duplicated.

PoC:

before send dos tx rss:
105700

after rss:
2306932

DoS cost: 25.6 KB * 150 + dep_tx out_points capacity ( 36 * 150 * 100 = 540000 ) = 4380000 CKB Send 50 dos_tx, memory exhausted: (25.6 KB * 150 * 100) * 50 = 19.2 GB