rest-client Gem Vulnerable to Session Fixation

The primary impact of CVE-2015-1820 is the potential for session fixation and cookie theft. An attacker could manipulate redirects within a Ruby application using rest-client to set cookies on the victim's browser. Subsequently, the attacker could then use these cookies to impersonate the victim, gaining unauthorized access to their account. This is particularly concerning in applications that rely heavily on cookies for authentication and session management. The vulnerability's ease of exploitation and the potential for significant data compromise make it a high-priority concern.

Ruby applications that utilize the rest-client library for making HTTP requests are at risk. This includes web applications, APIs, and automation scripts. Applications that rely on cookies for authentication and session management are particularly vulnerable.

• ruby / gem: Check gem versions using gem list rest-client. If the version is less than 1.8.0, the system is vulnerable. • ruby / gem: Inspect application code for usage of rest-client and identify potential redirect vulnerabilities. • generic web: Monitor application logs for unusual redirect patterns or cookie setting behavior.

1. 2015-07-16Discovery

   discovery

2. 2018-08-13Disclosure

   disclosure

3. 2018-08-13Patch

   patch

1. Publicada2018-08-13
2. Modificada2024-02-16
3. EPSS atualizado2026-04-02

The recommended mitigation for CVE-2015-1820 is to immediately upgrade to rest-client version 1.8.0 or later. If upgrading is not immediately feasible, consider implementing stricter cookie security measures, such as setting the HttpOnly and Secure flags on cookies to prevent cross-site scripting (XSS) attacks and man-in-the-middle (MITM) interception. Additionally, carefully review and validate all redirects within your application to ensure they are not susceptible to manipulation. After upgrading, confirm the fix by testing redirect functionality and verifying that cookies are not being improperly set.