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CVE-2020-5303
Detail
Modified
This vulnerability has been modified since it was last analyzed by the NVD. It is awaiting reanalysis which may result in further changes to the information provided.
Current 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.
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. ### For more information If you have any questions or comments about this advisory: * Open an issue in tendermint/tendermint * Email us at [security@tendermint.com](mailto:security@tendermint.com) More information can be found here. ### Credits - Ethan Buchman (@ebuchman) for writing a test case for Denial of Service 2 and Tess Rinearson (@tessr) for fixing it - Anton Kaliaev (@melekes) for fixing Denial of Service 1
NVD Analysts use publicly available information to associate vector strings and CVSS scores. We also display any CVSS information provided within the CVE List from the CNA.
Note: It is possible that the NVD CVSS may not match that of the CNA. The most common reason for this is that publicly available information does not provide sufficient detail or that information simply was not available at the time the CVSS vector string was assigned.
NVD Analysts use publicly available information to associate vector strings and CVSS scores. We also display any CVSS information provided within the CVE List from the CNA.
Note: NVD Analysts have published a CVSS score for this CVE based on publicly available information at the time of analysis. The CNA has not provided a score within the CVE List.
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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 r
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 rem
Initial Analysis by NIST4/13/2020 9:55:00 AM
Action
Type
Old Value
New Value
Added
CPE Configuration
OR
*cpe:2.3:a:tendermint:tendermint:*:*:*:*:*:*:*:* versions up to (excluding) 0.31.12
*cpe:2.3:a:tendermint:tendermint:*:*:*:*:*:*:*:* versions from (including) 0.32.0 up to (excluding) 0.32.10
*cpe:2.3:a:tendermint:tendermint:*:*:*:*:*:*:*:* versions from (including) 0.33.0 up to (excluding) 0.33.3
Added
CVSS V2
NIST (AV:N/AC:M/Au:N/C:N/I:N/A:P)
Added
CVSS V3.1
NIST AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L
Added
CWE
NIST CWE-787
Changed
Reference Type
https://github.com/tendermint/tendermint/commit/e2d6859afd7dba4cf97c7f7d412e7d8fc908d1cd No Types Assigned
https://github.com/tendermint/tendermint/commit/e2d6859afd7dba4cf97c7f7d412e7d8fc908d1cd Patch, Third Party Advisory
Changed
Reference Type
https://github.com/tendermint/tendermint/security/advisories/GHSA-v24h-pjjv-mcp6 No Types Assigned
https://github.com/tendermint/tendermint/security/advisories/GHSA-v24h-pjjv-mcp6 Third Party Advisory
Changed
Reference Type
https://hackerone.com/reports/820317 No Types Assigned
https://hackerone.com/reports/820317 Permissions Required, Third Party Advisory
Quick Info
CVE Dictionary Entry: CVE-2020-5303 NVD
Published Date: 04/10/2020 NVD
Last Modified: 06/30/2020
Source: GitHub, Inc.
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