CVE-2021-26920: apache software foundation apache druid Prototype Pollution

Vulnerability summary

CVE-2021-26920 is a medium (CVSS 6.5) Prototype Pollution vulnerability in apache software foundation apache druid. EPSS estimates a 9.50% chance of exploitation in the next 30 days, higher than 95.3% of scored vulnerabilities. 1 public exploit is recorded.

Timeline

1. 02-07-2021
   PublishedVulnerability first disclosed.
2. 03-08-2024
   Last modifiedVulnerability information updated.

Description

In the Druid ingestion system, the InputSource is used for reading data from a certain data source. However, the HTTP InputSource allows authenticated users to read data from other sources than intended, such as the local file system, with the privileges of the Druid server process. This is not an elevation of privilege when users access Druid directly, since Druid also provides the Local InputSource, which allows the same level of access. But it is problematic when users interact with Druid indirectly through an application that allows users to specify the HTTP InputSource, but not the Local InputSource. In this case, users could bypass the application-level restriction by passing a file URL to the HTTP InputSource.

• CWE-1321Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')The product receives input from an upstream component that specifies attributes that are to be initialized or updated in an object, but it does not properly control modifications of attributes of the object prototype.
• CWE-610Externally Controlled Reference to a Resource in Another SphereThe product uses an externally controlled name or reference that resolves to a resource that is outside of the intended control sphere.