CVE-2020-15237: Vulnerability Analysis & Exploit Details

CVE-2020-15237 Vulnerability Summary

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.

CVE-2020-15237: Detailed Information and External References

EPSS

0.00137

EPSS %

0.50224

References

0.00137

• https://github.com/shrinerb/shrine/commit/1b27090ce31543bf39f186c20ea47c8250fca2f0
• https://github.com/shrinerb/shrine/security/advisories/GHSA-5jjv-x4fq-qjwp

CWE

CWE-208

CAPEC

0.00137

• Cross-Domain Search Timing: An attacker initiates cross domain HTTP / GET requests and times the server responses. The timing of these responses may leak important information on what is happening on the server. Browser's same origin policy prevents the attacker from directly reading the server responses (in the absence of any other weaknesses), but does not prevent the attacker from timing the responses to requests that the attacker issued cross domain.
• Application Fingerprinting: An adversary engages in fingerprinting activities to determine the type or version of an application installed on a remote target.
• System Footprinting: An adversary engages in active probing and exploration activities to determine security information about a remote target system. Often times adversaries will rely on remote applications that can be probed for system configurations.

Vulnerable Configurations

• cpe:2.3:a:shrinerb:shrine:0.9.0:*:*:*:*:ruby:*:*
  cpe:2.3:a:shrinerb:shrine:0.9.0:*:*:*:*:ruby:*:*
• cpe:2.3:a:shrinerb:shrine:1.0.0:*:*:*:*:ruby:*:*
  cpe:2.3:a:shrinerb:shrine:1.0.0:*:*:*:*:ruby:*:*
• cpe:2.3:a:shrinerb:shrine:1.1.0:*:*:*:*:ruby:*:*
  cpe:2.3:a:shrinerb:shrine:1.1.0:*:*:*:*:ruby:*:*
• cpe:2.3:a:shrinerb:shrine:1.2.0:*:*:*:*:ruby:*:*
  cpe:2.3:a:shrinerb:shrine:1.2.0:*:*:*:*:ruby:*:*
• cpe:2.3:a:shrinerb:shrine:1.3.0:*:*:*:*:ruby:*:*
  cpe:2.3:a:shrinerb:shrine:1.3.0:*:*:*:*:ruby:*:*
• cpe:2.3:a:shrinerb:shrine:1.4.0:*:*:*:*:ruby:*:*
  cpe:2.3:a:shrinerb:shrine:1.4.0:*:*:*:*:ruby:*:*
• cpe:2.3:a:shrinerb:shrine:1.4.1:*:*:*:*:ruby:*:*
  cpe:2.3:a:shrinerb:shrine:1.4.1:*:*:*:*:ruby:*:*
• cpe:2.3:a:shrinerb:shrine:1.4.2:*:*:*:*:ruby:*:*
  cpe:2.3:a:shrinerb:shrine:1.4.2:*:*:*:*:ruby:*:*
• cpe:2.3:a:shrinerb:shrine:2.0.0:*:*:*:*:ruby:*:*
  cpe:2.3:a:shrinerb:shrine:2.0.0:*:*:*:*:ruby:*:*
• cpe:2.3:a:shrinerb:shrine:2.0.1:*:*:*:*:ruby:*:*
  cpe:2.3:a:shrinerb:shrine:2.0.1:*:*:*:*:ruby:*:*
• cpe:2.3:a:shrinerb:shrine:2.1.0:*:*:*:*:ruby:*:*
  cpe:2.3:a:shrinerb:shrine:2.1.0:*:*:*:*:ruby:*:*
• cpe:2.3:a:shrinerb:shrine:2.1.1:*:*:*:*:ruby:*:*
  cpe:2.3:a:shrinerb:shrine:2.1.1:*:*:*:*:ruby:*:*
• cpe:2.3:a:shrinerb:shrine:2.2.0:*:*:*:*:ruby:*:*
  cpe:2.3:a:shrinerb:shrine:2.2.0:*:*:*:*:ruby:*:*
• cpe:2.3:a:shrinerb:shrine:2.3.0:*:*:*:*:ruby:*:*
  cpe:2.3:a:shrinerb:shrine:2.3.0:*:*:*:*:ruby:*:*
• cpe:2.3:a:shrinerb:shrine:2.3.1:*:*:*:*:ruby:*:*
  cpe:2.3:a:shrinerb:shrine:2.3.1:*:*:*:*:ruby:*:*
• cpe:2.3:a:shrinerb:shrine:2.4.0:*:*:*:*:ruby:*:*
  cpe:2.3:a:shrinerb:shrine:2.4.0:*:*:*:*:ruby:*:*
• cpe:2.3:a:shrinerb:shrine:2.4.1:*:*:*:*:ruby:*:*
  cpe:2.3:a:shrinerb:shrine:2.4.1:*:*:*:*:ruby:*:*
• cpe:2.3:a:shrinerb:shrine:2.5.0:*:*:*:*:ruby:*:*
  cpe:2.3:a:shrinerb:shrine:2.5.0:*:*:*:*:ruby:*:*
• cpe:2.3:a:shrinerb:shrine:2.6.0:*:*:*:*:ruby:*:*
  cpe:2.3:a:shrinerb:shrine:2.6.0:*:*:*:*:ruby:*:*
• cpe:2.3:a:shrinerb:shrine:2.6.1:*:*:*:*:ruby:*:*
  cpe:2.3:a:shrinerb:shrine:2.6.1:*:*:*:*:ruby:*:*
• cpe:2.3:a:shrinerb:shrine:2.7.0:*:*:*:*:ruby:*:*
  cpe:2.3:a:shrinerb:shrine:2.7.0:*:*:*:*:ruby:*:*
• cpe:2.3:a:shrinerb:shrine:2.8.0:*:*:*:*:ruby:*:*
  cpe:2.3:a:shrinerb:shrine:2.8.0:*:*:*:*:ruby:*:*
• cpe:2.3:a:shrinerb:shrine:2.9.0:*:*:*:*:ruby:*:*
  cpe:2.3:a:shrinerb:shrine:2.9.0:*:*:*:*:ruby:*:*
• cpe:2.3:a:shrinerb:shrine:2.10.0:*:*:*:*:ruby:*:*
  cpe:2.3:a:shrinerb:shrine:2.10.0:*:*:*:*:ruby:*:*
• cpe:2.3:a:shrinerb:shrine:2.11.0:*:*:*:*:ruby:*:*
  cpe:2.3:a:shrinerb:shrine:2.11.0:*:*:*:*:ruby:*:*
• cpe:2.3:a:shrinerb:shrine:2.12.0:*:*:*:*:ruby:*:*
  cpe:2.3:a:shrinerb:shrine:2.12.0:*:*:*:*:ruby:*:*
• cpe:2.3:a:shrinerb:shrine:2.13.0:*:*:*:*:ruby:*:*
  cpe:2.3:a:shrinerb:shrine:2.13.0:*:*:*:*:ruby:*:*
• cpe:2.3:a:shrinerb:shrine:2.14.0:*:*:*:*:ruby:*:*
  cpe:2.3:a:shrinerb:shrine:2.14.0:*:*:*:*:ruby:*:*
• cpe:2.3:a:shrinerb:shrine:2.15.0:*:*:*:*:ruby:*:*
  cpe:2.3:a:shrinerb:shrine:2.15.0:*:*:*:*:ruby:*:*
• cpe:2.3:a:shrinerb:shrine:2.16.0:*:*:*:*:ruby:*:*
  cpe:2.3:a:shrinerb:shrine:2.16.0:*:*:*:*:ruby:*:*
• cpe:2.3:a:shrinerb:shrine:2.17.0:*:*:*:*:ruby:*:*
  cpe:2.3:a:shrinerb:shrine:2.17.0:*:*:*:*:ruby:*:*
• cpe:2.3:a:shrinerb:shrine:2.17.1:*:*:*:*:ruby:*:*
  cpe:2.3:a:shrinerb:shrine:2.17.1:*:*:*:*:ruby:*:*
• cpe:2.3:a:shrinerb:shrine:2.18.0:*:*:*:*:ruby:*:*
  cpe:2.3:a:shrinerb:shrine:2.18.0:*:*:*:*:ruby:*:*
• cpe:2.3:a:shrinerb:shrine:2.19.0:*:*:*:*:ruby:*:*
  cpe:2.3:a:shrinerb:shrine:2.19.0:*:*:*:*:ruby:*:*
• cpe:2.3:a:shrinerb:shrine:2.19.1:*:*:*:*:ruby:*:*
  cpe:2.3:a:shrinerb:shrine:2.19.1:*:*:*:*:ruby:*:*
• cpe:2.3:a:shrinerb:shrine:2.19.2:*:*:*:*:ruby:*:*
  cpe:2.3:a:shrinerb:shrine:2.19.2:*:*:*:*:ruby:*:*
• cpe:2.3:a:shrinerb:shrine:2.19.3:*:*:*:*:ruby:*:*
  cpe:2.3:a:shrinerb:shrine:2.19.3:*:*:*:*:ruby:*:*
• cpe:2.3:a:shrinerb:shrine:2.19.4:*:*:*:*:ruby:*:*
  cpe:2.3:a:shrinerb:shrine:2.19.4:*:*:*:*:ruby:*:*
• cpe:2.3:a:shrinerb:shrine:3.0.0:*:*:*:*:ruby:*:*
  cpe:2.3:a:shrinerb:shrine:3.0.0:*:*:*:*:ruby:*:*
• cpe:2.3:a:shrinerb:shrine:3.0.1:*:*:*:*:ruby:*:*
  cpe:2.3:a:shrinerb:shrine:3.0.1:*:*:*:*:ruby:*:*
• cpe:2.3:a:shrinerb:shrine:3.1.0:*:*:*:*:ruby:*:*
  cpe:2.3:a:shrinerb:shrine:3.1.0:*:*:*:*:ruby:*:*
• cpe:2.3:a:shrinerb:shrine:3.2.0:*:*:*:*:ruby:*:*
  cpe:2.3:a:shrinerb:shrine:3.2.0:*:*:*:*:ruby:*:*
• cpe:2.3:a:shrinerb:shrine:3.2.1:*:*:*:*:ruby:*:*
  cpe:2.3:a:shrinerb:shrine:3.2.1:*:*:*:*:ruby:*:*
• cpe:2.3:a:shrinerb:shrine:3.2.2:*:*:*:*:ruby:*:*
  cpe:2.3:a:shrinerb:shrine:3.2.2:*:*:*:*:ruby:*:*

CVSS3 Source

nvd@nist.gov

CVSS3 Type

Primary

CVSS3 Vector

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N