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