Vulnerability · Published Jul 9, 2020 · Assigned by GitHub_M

CVE-2020-15093Improper verification of signature threshold in tough

High 8.6

In plain English

A high-severity security flaw in tough from awslabs. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 1.4% (higher than 72% of all known vulnerabilities).

Severity (CVSS 3.1)8.6High

Exploit odds (30 days)1.4%top 28.2% of all CVEs

Exploited in the wildNo reportsnot in CISA KEV

Attack toolingNoneno public tooling known

Official description

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.

Affected products (as reported)

Vendor	Product	Versions
awslabs	tough	< 0.7.1

Weakness: CWE-347 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:N

References

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