CVE-2020-15093

Improper verification of signature threshold in tough

CVSS 8.6 HIGHEPSS 1.4%CWE-347

Vexday Risk Score

21Low

SSVC decision (CISA)

Track

No exploitation signal → monitor

CVSS 8.6EPSS 1.4%KEV nãoPoC —Nuclei —Metasploit —Patch —

Lifecycle

09 Jul 2020Published on NVD

Recommendation: Monitor — no exploitation signal at the moment.

The tough library (Rust/crates.io) prior to version 0.7.1 does not properly verify the threshold of cryptographic signatures. It allows an attacker to duplicate a valid signature in order to circumvent TUF requiring a minimum threshold of unique signatures before the metadata is considered valid. A fix is available in version 0.7.1. CVE-2020-6174 is assigned to the same vulnerability in the TUF reference implementation.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:N

Affected products

awslabs · tough

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References

https://crates.io/crates/tough https://github.com/awslabs/tough/security/advisories/GHSA-5q2r-92f9-4m49 https://github.com/theupdateframework/tuf/commit/2977188139d065ff3356c3cb4aec60c582b57e0e https://github.com/theupdateframework/tuf/pull/974