Vulnerability Details : CVE-2021-41272
Besu is an Ethereum client written in Java. Starting in version 21.10.0, changes in the implementation of the SHL, SHR, and SAR operations resulted in the introduction of a signed type coercion error in values that represent negative values for 32 bit signed integers. Smart contracts that ask for shifts between approximately 2 billion and 4 billion bits (nonsensical but valid values for the operation) will fail to execute and hence fail to validate. In networks where vulnerable versions are mining with other clients or non-vulnerable versions this will result in a fork and the relevant transactions will not be included in the fork. In networks where vulnerable versions are not mining (such as Rinkeby) no fork will result and the validator nodes will stop accepting blocks. In networks where only vulnerable versions are mining the relevant transaction will not be included in any blocks. When the network adds a non-vulnerable version the network will act as in the first case. Besu 21.10.2 contains a patch for this issue. Besu 21.7.4 is not vulnerable and clients can roll back to that version. There is a workaround available: Once a transaction with the relevant shift operations is included in the canonical chain, the only remediation is to make sure all nodes are on non-vulnerable versions.
Products affected by CVE-2021-41272
- cpe:2.3:a:linuxfoundation:besu:21.10.0:-:*:*:*:*:*:*
- cpe:2.3:a:linuxfoundation:besu:21.10.0:rc1:*:*:*:*:*:*
- cpe:2.3:a:linuxfoundation:besu:21.10.0:rc2:*:*:*:*:*:*
- cpe:2.3:a:linuxfoundation:besu:21.10.0:rc3:*:*:*:*:*:*
- cpe:2.3:a:linuxfoundation:besu:21.10.0:rc4:*:*:*:*:*:*
- cpe:2.3:a:linuxfoundation:besu:21.10.1:*:*:*:*:*:*:*
Exploit prediction scoring system (EPSS) score for CVE-2021-41272
0.15%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 51 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2021-41272
Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
---|---|---|---|---|---|---|
5.0
|
MEDIUM | AV:N/AC:L/Au:N/C:N/I:N/A:P |
10.0
|
2.9
|
NIST | |
7.5
|
HIGH | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
3.9
|
3.6
|
GitHub, Inc. |
CWE ids for CVE-2021-41272
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When converting from one data type to another, such as long to integer, data can be omitted or translated in a way that produces unexpected values. If the resulting values are used in a sensitive context, then dangerous behaviors may occur.Assigned by: security-advisories@github.com (Primary)
References for CVE-2021-41272
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https://github.com/hyperledger/besu/commit/4170524ac3b45185704fcfbdeeb71b0b05dfa0a1
Shift Optimization (#3039) · hyperledger/besu@4170524 · GitHubPatch;Third Party Advisory
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https://github.com/hyperledger/besu/pull/3039
Shift Optimization by shemnon · Pull Request #3039 · hyperledger/besu · GitHubIssue Tracking;Patch;Third Party Advisory
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https://github.com/hyperledger/besu/security/advisories/GHSA-7pg2-p5vj-xp5h
SHL, SHR, and SAR operations trigger native exception at key values · Advisory · hyperledger/besu · GitHubPatch;Third Party Advisory
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