CVE-2021-41272

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Summary

CVECVE-2021-41272
StatePUBLIC
Assigner[email protected]
Source PriorityCVE Program / NVD first with legacy fallback
Published2021-12-13 21:15:00 UTC
Updated2021-12-16 16:05:00 UTC
DescriptionBesu 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.

Risk And Classification

Problem Types: CWE-681

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Linuxfoundation Besu 21.10.0 - All All
Application Linuxfoundation Besu 21.10.0 rc1 All All
Application Linuxfoundation Besu 21.10.0 rc2 All All
Application Linuxfoundation Besu 21.10.0 rc3 All All
Application Linuxfoundation Besu 21.10.0 rc4 All All
Application Linuxfoundation Besu 21.10.1 All All All

References

ReferenceSourceLinkTags
Shift Optimization by shemnon · Pull Request #3039 · hyperledger/besu · GitHub MISC github.com
Shift Optimization (#3039) · hyperledger/besu@4170524 · GitHub MISC github.com
SHL, SHR, and SAR operations trigger native exception at key values · Advisory · hyperledger/besu · GitHub CONFIRM github.com
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NVD vulnerability detail NVD nvd.nist.gov canonical, analysis
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