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CVE-2020-5303— Denial of service in Tendermint

Quick assessment

Affected
Tendermint Tendermint
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Tendermint是美国Tendermint公司的一款Byzantine Fault Tolerant (BFT) 式中间件。 Tendermint 0.33.3之前版本、0.32.10之前版本和0.31.12版本中存在拒绝服务漏洞，该漏洞源于程序没有限制P2P连接请求的数量。攻击者可利用该漏洞造成拒绝服务。

CVSS 3.1 · Low EPSS 1.37% · P71
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I. Basic Information for CVE-2020-5303

Vulnerability Information
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Vulnerability Title
Denial of service in Tendermint
Source: CVE Program / CVE List V5
Vulnerability Description
Tendermint before versions 0.33.3, 0.32.10, and 0.31.12 has a denial-of-service vulnerability. Tendermint does not limit the number of P2P connection requests. For each p2p connection, it allocates XXX bytes. Even though this memory is garbage collected once the connection is terminated (due to duplicate IP or reaching a maximum number of inbound peers), temporary memory spikes can lead to OOM (Out-Of-Memory) exceptions. Additionally, Tendermint does not reclaim activeID of a peer after it's removed in Mempool reactor. This does not happen all the time. It only happens when a connection fails (for any reason) before the Peer is created and added to all reactors. RemovePeer is therefore called before AddPeer, which leads to always growing memory (activeIDs map). The activeIDs map has a maximum size of 65535 and the node will panic if this map reaches the maximum. An attacker can create a lot of connection attempts (exploiting above denial of service), which ultimately will lead to the node panicking. These issues are patched in Tendermint 0.33.3 and 0.32.10.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
未经控制的内存分配
Source: CVE Program / CVE List V5
Vulnerability Title
Tendermint 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Tendermint是美国Tendermint公司的一款Byzantine Fault Tolerant (BFT) 式中间件。 Tendermint 0.33.3之前版本、0.32.10之前版本和0.31.12版本中存在拒绝服务漏洞，该漏洞源于程序没有限制P2P连接请求的数量。攻击者可利用该漏洞造成拒绝服务。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Tendermint Tendermint >= 0.32.0, < 0.32.10 -

II. Public POCs for CVE-2020-5303

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III. Intelligence Information for CVE-2020-5303

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Patches & Fixes for CVE-2020-5303 (1)

Vendor Advisories for CVE-2020-5303 (1)

Other References for CVE-2020-5303 (1)

IV. Related Vulnerabilities

Same product: Tendermint
Same vendor: Tendermint
Same weakness: CWE-789

V. Comments for CVE-2020-5303

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