CVE-2020-5303

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Summary

CVECVE-2020-5303
StatePUBLIC
Assigner[email protected]
Source PriorityCVE Program / NVD first with legacy fallback
Published2020-04-10 19:15:00 UTC
Updated2020-06-30 18:15:00 UTC
DescriptionTendermint 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.

Risk And Classification

Problem Types: CWE-787

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Tendermint Tendermint All All All All
Application Tendermint Tendermint All All All All

References

ReferenceSourceLinkTags
HackerOne MISC hackerone.com Permissions Required, Third Party Advisory
p2p: limit the number of incoming connections · tendermint/tendermint@e2d6859 · GitHub MISC github.com Patch, Third Party Advisory
Security Advisory Lavender · Advisory · tendermint/tendermint · GitHub CONFIRM github.com Third Party Advisory
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Legacy QID Mappings

  • 982386 Go (go) Security Update for github.com/tendermint/tendermint/p2p (GHSA-v24h-pjjv-mcp6)

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