CVE-2020-15093
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.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (1.36%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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.
- CVSS 3.1
- 8.6 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:N
- EPSS
- 1.36% probability · 70th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-347
- Affected
- amazon/tough
- Source
- security-advisories@github.com
References
- https://crates.io/crates/toughThird Party Advisory
- https://github.com/awslabs/tough/security/advisories/GHSA-5q2r-92f9-4m49Third Party Advisory
- https://github.com/theupdateframework/tuf/commit/2977188139d065ff3356c3cb4aec60c582b57e0ePatch, Third Party Advisory
- https://github.com/theupdateframework/tuf/pull/974Issue Tracking, Patch, Third Party Advisory
- https://crates.io/crates/toughThird Party Advisory
- https://github.com/awslabs/tough/security/advisories/GHSA-5q2r-92f9-4m49Third Party Advisory
- https://github.com/theupdateframework/tuf/commit/2977188139d065ff3356c3cb4aec60c582b57e0ePatch, Third Party Advisory
- https://github.com/theupdateframework/tuf/pull/974Issue Tracking, Patch, Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.