QID 982428

QID 982428: Go (go) Security Update for github.com/filecoin-project/lotus (GHSA-4g52-pqcj-phvh)

Security update has been released for github.com/filecoin-project/lotus to fix the vulnerability.

Note: The preceding description block is extracted directly from the security advisory. Using automation, we have attempted to clean and format it as much as possible without introducing additional issues.

1. 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.
2. 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.

CVSS V3 rated as High - 7.5 severity.

CVSS V2 rated as Medium - 5 severity.

Solution

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

Vendor References

GHSA-4g52-pqcj-phvh - github.com/advisories/GHSA-4g52-pqcj-phvh

CVEs related to QID 982428

CVE-2021-21405 |

Software Advisories

Advisory ID	Software	Component	Link
GHSA-4g52-pqcj-phvh	github.com/filecoin-project/lotus		github.com/advisories/GHSA-4g52-pqcj-phvh

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