CVE-2020-15093: Improper verification of signature threshold in tough
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 Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade
toughto a version that resolves this vulnerability.Fixed in 0.7.1
Event History
Frequently Asked Questions
What is the vulnerability ID of this issue?
The vulnerability ID of this issue is CVE-2020-15093.
What is the severity of CVE-2020-15093?
The severity of CVE-2020-15093 is high with a severity value of 8.6.
Which software versions are affected by CVE-2020-15093?
Versions prior to 0.7.1 of the tough library (Rust/crates.io) are affected by CVE-2020-15093.
How does CVE-2020-15093 allow an attacker to circumvent TUF?
CVE-2020-15093 allows an attacker to duplicate a valid signature, bypassing TUF's requirement for a minimum threshold of unique signatures.
Where can I find more information about CVE-2020-15093?
You can find more information about CVE-2020-15093 in the following references: [1](https://crates.io/crates/tough) [2](https://github.com/awslabs/tough/security/advisories/GHSA-5q2r-92f9-4m49) [3](https://github.com/theupdateframework/tuf/commit/2977188139d065ff3356c3cb4aec60c582b57e0e).