CVE-2020-15237

Timing attack in Shrine

Description

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.

Category

5.9
CVSS
Severity: Medium
CVSS 3.1 •
CVSS 2.0 •
EPSS 0.32%
Third-Party Advisory github.com Third-Party Advisory github.com
Affected: shrinerb shrine
Published at:
Updated at:

References

Link Tags
https://github.com/shrinerb/shrine/security/advisories/GHSA-5jjv-x4fq-qjwp third party advisory
https://github.com/shrinerb/shrine/commit/1b27090ce31543bf39f186c20ea47c8250fca2f0 third party advisory patch

Frequently Asked Questions

What is the severity of CVE-2020-15237?
CVE-2020-15237 has been scored as a medium severity vulnerability.
How to fix CVE-2020-15237?
To fix CVE-2020-15237, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2020-15237 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2020-15237 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2020-15237?
CVE-2020-15237 affects shrinerb shrine.
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