Podatność CVE-2021-21405


Publikacja: 2021-04-15   Modyfikacja: 2021-04-16

Opis:
Lotus is an Implementation of the Filecoin protocol written in Go. BLS signature validation in lotus uses blst library method VerifyCompressed. This method accepts signatures in 2 forms: "serialized", and "compressed", meaning that BLS signatures can be provided as either of 2 unique byte arrays. Lotus block validation functions perform a uniqueness check on provided blocks. Two blocks are considered distinct if the CIDs of their blockheader do not match. The CID method for blockheader includes the BlockSig of the block. The result of these issues is that it would be possible to punish miners for valid blocks, as there are two different valid block CIDs available for each block, even though this must be unique. By switching from the go based `blst` bindings over to the bindings in `filecoin-ffi`, the code paths now ensure that all signatures are compressed by size and the way they are deserialized. This happened in https://github.com/filecoin-project/lotus/pull/5393.

Typ:

CWE-347

(Improper Verification of Cryptographic Signature)

CVSS2 => (AV:N/AC:L/Au:N/C:N/I:P/A:N)

Ogólna skala CVSS
Znaczenie
Łatwość wykorzystania
5/10
2.9/10
10/10
Wymagany dostęp
Złożoność ataku
Autoryzacja
Zdalny
Niska
Nie wymagana
Wpływ na poufność
Wpływ na integralność
Wpływ na dostępność
Brak
Częściowy
Brak
Affected software
Filecoin -> Lotus 

 Referencje:
https://github.com/filecoin-project/lotus/pull/5393
https://gist.github.com/wadeAlexC/2490d522e81a796af9efcad1686e6754
https://github.com/filecoin-project/lotus/security/advisories/GHSA-4g52-pqcj-phvh

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