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CVE-2021-21271— Tendermint 资源管理错误漏洞

一分钟漏洞结论

影响对象
tendermint tendermint
利用判断
尚无明确在野利用证据，仍需结合暴露面评估
建议动作
优先检查厂商安全公告和参考链接中的修复版本；无法立即升级时，限制受影响服务暴露并加强监测。

Tendermint是美国Tendermint公司的一款Byzantine Fault Tolerant (BFT) 式中间件。 Tendermint Core 存在安全漏洞，该漏洞源于无效DuplicateVoteEvidence的任何节点将提出无效证据。

CVSS 6.5 · Medium EPSS 1.74% · P77
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一、 漏洞 CVE-2021-21271 基础信息

漏洞信息
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Vulnerability Title
Denial of service in TenderMint Core
来源: CVE Program / CVE List V5
Vulnerability Description
Tendermint Core is an open source Byzantine Fault Tolerant (BFT) middleware that takes a state transition machine - written in any programming language - and securely replicates it on many machines. Tendermint Core v0.34.0 introduced a new way of handling evidence of misbehavior. As part of this, we added a new Timestamp field to Evidence structs. This timestamp would be calculated using the same algorithm that is used when a block is created and proposed. (This algorithm relies on the timestamp of the last commit from this specific block.) In Tendermint Core v0.34.0-v0.34.2, the consensus reactor is responsible for forming DuplicateVoteEvidence whenever double signs are observed. However, the current block is still “in flight” when it is being formed by the consensus reactor. It hasn’t been finalized through network consensus yet. This means that different nodes in the network may observe different “last commits” when assigning a timestamp to DuplicateVoteEvidence. In turn, different nodes could form DuplicateVoteEvidence objects at the same height but with different timestamps. One DuplicateVoteEvidence object (with one timestamp) will then eventually get finalized in the block, but this means that any DuplicateVoteEvidence with a different timestamp is considered invalid. Any node that formed invalid DuplicateVoteEvidence will continue to propose invalid evidence; its peers may see this, and choose to disconnect from this node. This bug means that double signs are DoS vectors in Tendermint Core v0.34.0-v0.34.2. Tendermint Core v0.34.3 is a security release which fixes this bug. As of v0.34.3, DuplicateVoteEvidence is no longer formed by the consensus reactor; rather, the consensus reactor passes the Votes themselves into the EvidencePool, which is now responsible for forming DuplicateVoteEvidence. The EvidencePool has timestamp info that should be consistent across the network, which means that DuplicateVoteEvidence formed in this reactor should have consistent timestamps. This release changes the API between the consensus and evidence reactors.
来源: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
来源: CVE Program / CVE List V5
Vulnerability Type
未加控制的资源消耗(资源穷尽)
来源: CVE Program / CVE List V5
Vulnerability Title
Tendermint 资源管理错误漏洞
来源: 中国国家信息安全漏洞库 CNNVD
Vulnerability Description
Tendermint是美国Tendermint公司的一款Byzantine Fault Tolerant (BFT) 式中间件。 Tendermint Core 存在安全漏洞，该漏洞源于无效DuplicateVoteEvidence的任何节点将提出无效证据。
来源: 中国国家信息安全漏洞库 CNNVD
CVSS Information
N/A
来源: 中国国家信息安全漏洞库 CNNVD
Vulnerability Type
N/A
来源: 中国国家信息安全漏洞库 CNNVD

受影响产品

厂商 产品 影响版本 CPE 订阅
tendermint tendermint >= 0.34.0, < 0.34.3 -

二、漏洞 CVE-2021-21271 的公开POC

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三、漏洞 CVE-2021-21271 的情报信息

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CVE-2021-21271 补丁与修复 (1)

CVE-2021-21271 厂商安全公告 (1)

CVE-2021-21271 其他参考 (1)

IV. Related Vulnerabilities

Same product: tendermint
Same vendor: tendermint
Same weakness: CWE-400

V. Comments for CVE-2021-21271

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