CVE-2021-42948

What it actually does

Session identifiers are transmitted in cleartext within URL query parameters, exposing them to interception via browser history, server logs, referer headers, and network captures.

Why it matters to the business

Attackers may obtain valid sessions to view or manipulate hotel booking and guest data, potentially leading to privacy incidents or operational disruption even though the flaw is difficult to exploit at scale.

How an attack unfolds

An attacker observes URLs generated by the application that embed session tokens, extracts the token values from logs or intercepted traffic, and replays the tokens in subsequent requests to impersonate legitimate users.

How to fix it

Upgrade to the latest version of HotelDruid that removes session tokens from GET parameters; until then, configure the application to transmit sessions only via secure cookies and ensure all sensitive links use POST requests.

How to confirm the fix worked

Review application source and generated URLs to confirm session identifiers no longer appear in query strings; inspect server logs and browser developer tools for absence of tokens in GET requests after upgrade.

Typical attack path

1. Identify application-generated links containing session identifiers in query strings
2. Capture tokens from browser history, web server access logs, or network traffic
3. Reuse captured tokens in authenticated requests to access protected resources
4. Maintain session access until the token expires or is invalidated

How to detect it

Search web server access logs, proxy logs, and browser histories for requests containing session tokens embedded in query strings; look for repeated use of the same token from unexpected IP addresses or user agents.

• session= in GET query strings
• phpsessid= in URLs
• sid= in request parameters

What your security team should do

• Prioritize patching or migrating away from the affected HotelDruid version given the long exposure window
• Audit web server and proxy logs for historical presence of session tokens in URLs
• Enforce HTTPS everywhere and disable any features that log full request URLs
• Monitor EPSS trend and re-evaluate risk if exploit code appears