CVE-2021-41248 Information

Description

GraphiQL is the reference implementation of this monorepo GraphQL IDE an official project under the GraphQL Foundation. All versions of graphiql older than graphiql@1.4.7 are vulnerable to compromised HTTP schema introspection responses or schema prop values with malicious GraphQL type names exposing a dynamic XSS attack surface that can allow code injection on operation autocomplete. In order for the attack to take place the user must load a vulnerable schema in graphiql. There are a number of ways that can occur. By default the schema URL is not attacker-controllable in graphiql or in its suggested implementations or examples leaving only very complex attack vectors. If a custom implementation of graphiql’s fetcher allows the schema URL to be set dynamically such as a URL query parameter like ?endpoint= in graphql-playground or a database provided value then this custom graphiql implementation is vulnerable to phishing attacks and thus much more readily available low or no privelege level xss attacks. The URLs could look like any generic looking graphql schema URL. It should be noted that desktop clients such as Altair Insomnia Postwoman do not appear to be impacted by this. This vulnerability does not impact codemirror-graphql monaco-graphql or other dependents as it exists in onHasCompletion.ts in graphiql. It does impact all forks of graphiql and every released version of graphiql.

CVSS Vector

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

Reference

https://github.com/graphql/graphql-playground/security/advisories/GHSA-59r9-6jp6-jcm7 https://github.com/graphql/graphiql/security/advisories/GHSA-x4r7-m2q9-69c8 https://github.com/graphql/graphiql/commit/cb237eeeaf7333c4954c752122261db7520f7bf4

Attack Complexity

HIGH

Privileges Required

NONE

User Interaction Required

NONE

Scope

REQUIRED

Confidentiality Impact

CHANGED

Integrity Impact

LOW

Availability Impact

LOW

Base Score

NONE

Base Severity

4.7