Shrine up to 3.2.x derivation_endpoint Plugin Utils.secure_compare information exposure
|CVSS Meta Temp Score|
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|Current Exploit Price (≈)|
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|CTI Interest Score|
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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.
CVSSv3VulDB 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: 🔍
VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍
NVD Base Score: 🔒
ExploitingClass: Information disclosure
Status: Not defined
Price Prediction: 🔍
Current Price Estimation: 🔒
Threat IntelligenceThreat: 🔍
0-Day Time: 🔒
Upgrade: Shrine 3.3.0
Timeline06/25/2020 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
CVE: CVE-2020-15237 (🔒)
EntryCreated: 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
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