fix: Sanitize control characters in page parameter response headers

Strip control characters from page parameter header values to prevent
ERR_INVALID_CHAR errors when parameters contain CRLF or other control
characters. The sanitization is applied regardless of the
encodePageParamHeaders setting.

Author: mtrezza

spec/PagesRouter.spec.js

@@ -1040,6 +1040,32 @@ describe('Pages Router', () => {
         }).catch(e => e);
         expect(response.status).not.toBe(500);
       });
+
+      it('does not return 500 when page parameter contains CRLF characters', async () => {
+        await reconfigureServer(config);
+        const crlf = 'abc\r\nX-Injected: 1';
+        const url = `${config.publicServerURL}/apps/choose_password?appId=test&token=${encodeURIComponent(crlf)}&username=testuser`;
+        const response = await request({
+          url: url,
+          followRedirects: false,
+        }).catch(e => e);
+        expect(response.status).not.toBe(500);
+        expect(response.status).toBe(200);
+      });
+
+      it('does not return 500 when page parameter contains CRLF characters in redirect response', async () => {
+        await reconfigureServer(config);
+        const crlf = 'abc\r\nX-Injected: 1';
+        const url = `${config.publicServerURL}/apps/test/resend_verification_email`;
+        const response = await request({
+          method: 'POST',
+          url: url,
+          headers: { 'Content-Type': 'application/x-www-form-urlencoded' },
+          body: `username=${encodeURIComponent(crlf)}`,
+          followRedirects: false,
+        }).catch(e => e);
+        expect(response.status).not.toBe(500);
+      });
     });
 
     describe('custom route', () => {

src/Routers/PagesRouter.js

@@ -455,13 +455,7 @@ export class PagesRouter extends PromiseRouter {
 
     // Add placeholders in header to allow parsing for programmatic use
     // of response, instead of having to parse the HTML content.
-    const encode = this.pagesConfig.encodePageParamHeaders;
-    const headers = Object.entries(params).reduce((m, p) => {
-      if (p[1] !== undefined) {
-        m[`${pageParamHeaderPrefix}${p[0].toLowerCase()}`] = encode ? encodeURIComponent(p[1]) : p[1];
-      }
-      return m;
-    }, {});
+    const headers = this.composePageParamHeaders(params);
 
     return { text: data, headers: headers };
   }
@@ -555,6 +549,29 @@ export class PagesRouter extends PromiseRouter {
     return locale;
   }
 
+  /**
+   * Composes page parameter headers from the given parameters. Control
+   * characters are always stripped from header values to prevent
+   * ERR_INVALID_CHAR errors. Values are URI-encoded if the
+   * `encodePageParamHeaders` option is enabled.
+   * @param {Object} params The parameters to include in the headers.
+   * @returns {Object} The headers object.
+   */
+  composePageParamHeaders(params) {
+    const encode = this.pagesConfig.encodePageParamHeaders;
+    return Object.entries(params).reduce((m, p) => {
+      if (p[1] !== undefined) {
+        let value = encode ? encodeURIComponent(p[1]) : p[1];
+        if (typeof value === 'string') {
+          // eslint-disable-next-line no-control-regex
+          value = value.replace(/[\x00-\x1f\x7f]/g, '');
+        }
+        m[`${pageParamHeaderPrefix}${p[0].toLowerCase()}`] = value;
+      }
+      return m;
+    }, {});
+  }
+
   /**
    * Creates a response with http redirect.
    * @param {Object} req The express request.
@@ -578,13 +595,7 @@ export class PagesRouter extends PromiseRouter {
 
     // Add parameters to header to allow parsing for programmatic use
     // of response, instead of having to parse the HTML content.
-    const encode = this.pagesConfig.encodePageParamHeaders;
-    const headers = Object.entries(params).reduce((m, p) => {
-      if (p[1] !== undefined) {
-        m[`${pageParamHeaderPrefix}${p[0].toLowerCase()}`] = encode ? encodeURIComponent(p[1]) : p[1];
-      }
-      return m;
-    }, {});
+    const headers = this.composePageParamHeaders(params);
 
     return {
       status: 303,