CVE-2021-21405
Lotus BLS Signature Confusion Vulnerability
Description
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.
INFO
Published Date :
April 15, 2021, 10:15 p.m.
Last Modified :
Nov. 21, 2024, 5:48 a.m.
Source :
[email protected]
Remotely Exploitable :
Yes !
Impact Score :
3.6
Exploitability Score :
3.9
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2021-21405.
| URL | Resource |
|---|---|
| https://gist.github.com/wadeAlexC/2490d522e81a796af9efcad1686e6754 | Exploit Third Party Advisory |
| https://github.com/filecoin-project/lotus/pull/5393 | Patch Third Party Advisory |
| https://github.com/filecoin-project/lotus/security/advisories/GHSA-4g52-pqcj-phvh | Patch Third Party Advisory |
| https://gist.github.com/wadeAlexC/2490d522e81a796af9efcad1686e6754 | Exploit Third Party Advisory |
| https://github.com/filecoin-project/lotus/pull/5393 | Patch Third Party Advisory |
| https://github.com/filecoin-project/lotus/security/advisories/GHSA-4g52-pqcj-phvh | Patch Third Party Advisory |
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2021-21405 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2021-21405 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Modified by af854a3a-2127-422b-91ae-364da2661108
Nov. 21, 2024
Action Type Old Value New Value Added Reference https://gist.github.com/wadeAlexC/2490d522e81a796af9efcad1686e6754 Added Reference https://github.com/filecoin-project/lotus/pull/5393 Added Reference https://github.com/filecoin-project/lotus/security/advisories/GHSA-4g52-pqcj-phvh -
CVE Modified by [email protected]
May. 14, 2024
Action Type Old Value New Value -
Initial Analysis by [email protected]
Apr. 23, 2021
Action Type Old Value New Value Added CVSS V2 NIST (AV:N/AC:L/Au:N/C:N/I:P/A:N) Added CVSS V3.1 NIST AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N Changed Reference Type https://gist.github.com/wadeAlexC/2490d522e81a796af9efcad1686e6754 No Types Assigned https://gist.github.com/wadeAlexC/2490d522e81a796af9efcad1686e6754 Exploit, Third Party Advisory Changed Reference Type https://github.com/filecoin-project/lotus/pull/5393 No Types Assigned https://github.com/filecoin-project/lotus/pull/5393 Patch, Third Party Advisory Changed Reference Type https://github.com/filecoin-project/lotus/security/advisories/GHSA-4g52-pqcj-phvh No Types Assigned https://github.com/filecoin-project/lotus/security/advisories/GHSA-4g52-pqcj-phvh Patch, Third Party Advisory Added CPE Configuration OR *cpe:2.3:a:filecoin:lotus:*:*:*:*:*:*:*:* versions up to (excluding) 1.5.0
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2021-21405 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2021-21405
weaknesses.
Exploit Prediction
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.
0.17 }} 0.02%
score
0.35332
percentile