Shrine up to 3.2.x derivation_endpoint Plugin Utils.secure_compare information exposure

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CVSS Meta Temp Score
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CTI Interest Score
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5.3$0-$5k0.00

A vulnerability, which was classified as problematic, was found in Shrine up to 3.2.x. This affects the function Rack::Utils.secure_compare of the component derivation_endpoint Plugin. The manipulation with an unknown input leads to a information disclosure vulnerability. CWE is classifying the issue as CWE-203. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

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.

The weakness was released 10/04/2020. It is possible to read the advisory at github.com. This vulnerability is uniquely identified as CVE-2020-15237 since 06/25/2020. The attack needs to be done within the local network. A authentication is necessary for exploitation. Technical details of the vulnerability are known, but there is no available exploit.

Upgrading to version 3.3.0 eliminates this vulnerability. Applying a patch is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

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CPE 2.3infoedit

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CVSSv3infoedit

VulDB Meta Base Score: 5.5
VulDB Meta Temp Score: 5.3

VulDB Base Score: 5.5
VulDB Temp Score: 5.3
VulDB Vector: 🔒
VulDB Reliability: 🔍

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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

NVD Base Score: 🔒

Exploitinginfoedit

Class: Information disclosure
CWE: CWE-203
ATT&CK: Unknown

Local: No
Remote: Partially

Availability: 🔒
Status: Not defined

Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfoedit

Threat: 🔍
Adversaries: 🔍
Geopolitics: 🔍
Economy: 🔍
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Remediation: 🔍

Countermeasuresinfoedit

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Shrine 3.3.0
Patch: github.com

Timelineinfoedit

06/25/2020 CVE assigned
10/04/2020 +101 days Advisory disclosed
10/06/2020 +2 days VulDB entry created
11/16/2020 +41 days VulDB last update

Sourcesinfoedit

Advisory: github.com
Status: Confirmed
Confirmation: 🔒

CVE: CVE-2020-15237 (🔒)

Entryinfoedit

Created: 10/06/2020 10:27 AM
Updated: 11/16/2020 05:02 PM
Changes: (7) vulnerability_cvss2_nvd_av vulnerability_cvss2_nvd_ac vulnerability_cvss2_nvd_au vulnerability_cvss2_nvd_ci vulnerability_cvss2_nvd_ii vulnerability_cvss2_nvd_ai source_cve_cna
Complete: 🔍

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