CVE Vulnerabilities

CVE-2021-23383

Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')

Published: May 04, 2021 | Modified: Dec 03, 2021
CVSS 3.x
9.8
CRITICAL
Source:
NVD
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS 2.x
7.5 HIGH
AV:N/AC:L/Au:N/C:P/I:P/A:P
RedHat/V2
RedHat/V3
9.8 MODERATE
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Ubuntu
MEDIUM

The package handlebars before 4.7.7 are vulnerable to Prototype Pollution when selecting certain compiling options to compile templates coming from an untrusted source.

Weakness

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.

Affected Software

Name Vendor Start Version End Version
Handlebars Handlebarsjs * 4.7.7 (excluding)
OpenShift Logging 5.1 RedHat openshift-logging/kibana6-rhel8:v6.8.1-48 *
OpenShift Logging 5.2 RedHat openshift-logging/kibana6-rhel8:v6.8.1-47 *
Red Hat Advanced Cluster Management for Kubernetes 2.3 for RHEL 8 RedHat rhacm2/application-ui-rhel8:v2.3.0-120 *
Red Hat OpenShift Container Platform 4.6 RedHat openshift4/ose-logging-kibana6:v4.6.0-202106181629.p0.git.40f3e72 *
RHPAM 7.13.1 async RedHat handlebars *
Node-handlebars Ubuntu bionic *
Node-handlebars Ubuntu groovy *
Node-handlebars Ubuntu hirsute *
Node-handlebars Ubuntu impish *
Node-handlebars Ubuntu kinetic *
Node-handlebars Ubuntu lunar *
Node-handlebars Ubuntu mantic *
Node-handlebars Ubuntu trusty *
Node-handlebars Ubuntu xenial *

Extended Description

By adding or modifying attributes of an object prototype, it is possible to create attributes that exist on every object, or replace critical attributes with malicious ones. This can be problematic if the product depends on existence or non-existence of certain attributes, or uses pre-defined attributes of object prototype (such as hasOwnProperty, toString or valueOf). This weakness is usually exploited by using a special attribute of objects called proto, constructor or prototype. Such attributes give access to the object prototype. This weakness is often found in code that assigns object attributes based on user input, or merges or clones objects recursively.

Potential Mitigations

References