T05 · Unauthorized Access and Privilege Escalation
Error
- Location
src/services/chatService.ts:10- Finding
Unauthenticated Chat Access and User Impersonation
- Content
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Vulnerability Details
File Location:
src/services/chatService.ts:10-59,src/services/chatService.ts:111-118, andsrc/services/chatService.ts:146-169
Vulnerability Type: Missing authentication and room-level authorization
Risk Level: HighVulnerable Code
ts static sendMessage( roomId: number, userId: string, userName: string, content: string, messageType: MessageType = MessageType.TEXT ): ChatMessage { const db = getDatabase(); const result = db.prepare(` INSERT INTO chat_messages (room_id, user_id, user_name, content, message_type) VALUES (?, ?, ?, ?, ?) `).run(roomId, userId, userName, content, messageType); const message = this.getById(result.lastInsertRowid as number)!; chatEvents.emit('message', { roomId, message }); return message; }ts static getRoomMessages( roomId: number, limit: number = 100, beforeId?: number ): ChatMessage[] { const db = getDatabase(); let sql = 'SELECT * FROM chat_messages WHERE room_id = ?'; const params: any[] = [roomId]; if (beforeId) { sql += ' AND id < ?'; params.push(beforeId); } sql += ' ORDER BY created_at DESC LIMIT ?'; params.push(limit); const rows = db.prepare(sql).all(...params) as any[]; return rows.map(this.mapRowToMessage).reverse(); }ts static deleteMessage(messageId: number, userId: string): boolean { const db = getDatabase(); const message = this.getById(messageId); if (!message) throw new Error('Message does not exist'); if (message.userId !== userId) throw new Error('Users may only delete their own messages'); const result = db.prepare('DELETE FROM chat_messages WHERE id = ?').run(messageId); return result.changes > 0; }ts static exportChat(roomId: number): string { const messages = this.getRoomMessages(roomId, 10000); let markdow ...[truncated 2712 chars]- Remediation
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Remediation Suggestions
- Introduce an authenticated principal derived from a verified session or signed token. Do not accept the acting user ID as an authoritative request parameter.
- Change service methods to receive a trusted authentication context, such as
AuthContext, and deriveuserIdfrom that context. - Before every chat read, search, statistics, or export operation, verify that the authenticated user belongs to the requested room.
- Before sending a message, verify that the room exists, that the authenticated user is a member, and that the room status permits messaging.
- Load the display name from the registered user record instead of accepting
userNamefrom the caller. - For deletion, compare the message owner with the authenticated principal rather than a supplied
userId. Define explicit moderator or host permissions if privileged deletion is required. - Apply pagination and bounded limits to exports and history operations to reduce denial-of-service exposure.
- Centralize room authorization in a reusable guard so new chat methods cannot accidentally omit membership checks.
- Add negative tests covering non-members, spoofed identities, unauthorized exports, and deletion attempts using another user's ID.