CVSS 3.1
5.9 mediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:NCVE-2020-15237
Medium (5.9) in shrinerb shrine. EPSS 1.0% chance of exploitation in the next 30 days. Fixed in shrine 3.3.0.
In Shrine before version 3.3.0, when using the `derivation_endpoint` plugin, it's possible for the attacker to use a timing attack to guess the signature of the derivation URL. The problem has been fixed by comparing sent and calculated signature in constant time, using `Rack::Utils.secure_compare`. Users using the `derivation_endpoint` plugin are urged to upgrade to Shrine 3.3.0 or greater. A possible workaround is provided in the linked advisory.
Severity
- EPSS
- 1.0% chance of exploitation in the next 30 days; higher than 63% of CVEs (scores of 2026-10-31)
- CWEs
- CWE-203, CWE-208
- Published
- Modified
- Record from
- the NVD, synced
Affected
- shrinerb:shrine
Packages (OSV)
| Advisory | Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|---|
| GHSA-5jjv-x4fq-qjwp | RubyGems | shrine | <3.3.0 | 3.3.0 |
References
- https://github.com/shrinerb/shrine/commit/1b27090ce31543bf39f186c20ea47c8250fca2f0
- https://github.com/shrinerb/shrine/security/advisories/GHSA-5jjv-x4fq-qjwp
- https://github.com/shrinerb/shrine/commit/1b27090ce31543bf39f186c20ea47c8250fca2f0
- https://github.com/shrinerb/shrine/security/advisories/GHSA-5jjv-x4fq-qjwp