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fix(compiler): disallow i18n resource url attributes (XSS) #68580

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fix(compiler): disallow i18n resource url attributes (XSS) #68580

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30 changes: 23 additions & 7 deletions packages/compiler/src/render3/view/i18n/meta.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -12,7 +12,10 @@ import * as i18n from '../../../i18n/i18n_ast';
import {createI18nMessageFactory, VisitNodeFn} from '../../../i18n/i18n_parser';
import * as html from '../../../ml_parser/ast';
import {ParseTreeResult} from '../../../ml_parser/parser';
import {splitNsName} from '../../../ml_parser/tags';
import * as o from '../../../output/output_ast';
import {SecurityContext} from '../../../core';
import {DomElementSchemaRegistry} from '../../../schema/dom_element_schema_registry';
import {isTrustedTypesSink} from '../../../schema/trusted_types_sinks';

import {hasI18nAttrs, I18N_ATTR, I18N_ATTR_PREFIX, icuFromI18nMessage} from './util';
Expand Down Expand Up @@ -49,6 +52,25 @@ const setI18nRefs = (originalNodeMap: Map<html.Node, html.Node>): VisitNodeFn =>
};
};

const domSchema = new DomElementSchemaRegistry();

function isSecuritySensitiveI18nAttribute(
node: html.Element | html.Component,
attrName: string,
): boolean {
const tagName = node instanceof html.Component ? node.tagName : node.name;
if (tagName === null) {
return false;
}

const elementName = splitNsName(tagName)[1];
return (
isTrustedTypesSink(elementName, attrName) ||
domSchema.securityContext(elementName, attrName, /* isAttribute */ true) ===
SecurityContext.RESOURCE_URL
);
}

/**
* This visitor walks over HTML parse tree and converts information stored in
* i18n-related attributes ("i18n" and "i18n-*") into i18n meta object that is
Expand Down Expand Up @@ -201,14 +223,8 @@ export class I18nMetaVisitor implements html.Visitor {
} else if (attr.name.startsWith(I18N_ATTR_PREFIX)) {
// 'i18n-*' attributes
const name = attr.name.slice(I18N_ATTR_PREFIX.length);
let isTrustedType: boolean;
if (node instanceof html.Component) {
isTrustedType = node.tagName === null ? false : isTrustedTypesSink(node.tagName, name);
} else {
isTrustedType = isTrustedTypesSink(node.name, name);
}

if (isTrustedType) {
if (isSecuritySensitiveI18nAttribute(node, name)) {
this._reportError(
attr,
`Translating attribute '${name}' is disallowed for security reasons.`,
Expand Down
13 changes: 13 additions & 0 deletions packages/core/test/linker/security_integration_spec.ts
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Expand Up @@ -273,5 +273,18 @@ describe('security integration tests', function () {
/Translating attribute 'innerHTML' is disallowed for security reasons./,
);
});

it('should throw error on translated SVG script ResourceURL attributes', () => {
const template = `
<svg>
<script href="/safe-svg-script.js" i18n-href></script>
</svg>
`;
TestBed.overrideComponent(SecuredComponent, {set: {template}});

expect(() => TestBed.createComponent(SecuredComponent)).toThrowError(
/Translating attribute 'href' is disallowed for security reasons./,
);
});
});
});
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