CVE-2024-27917

Workarounds

Using Redis for Sessions, as this does not trigger the exploit code. Example configuration for Redis

# php.ini
session.save_handler = redis
session.save_path = "tcp://127.0.0.1:6379"

Consequences

As an guest browser session has been cached on a 404 page, every missing image or directly reaching a 404 page will logout the customer or clear his cart.

The Symfony Session Handler, pop's the Session Cookie and assign it to the Response. Since Shopware 6.5.8.0 the 404 pages, are cached, to improve the performance of 404 pages. So the cached Response, contains a Session Cookie when the Browser accessing the 404 page, has no cookies yet. The Symfony Session Handler is in use, when no explicit Session configuration has been done.
When Redis is in use for Sessions using the PHP Redis extension, this exploiting code is not used.

CVE-2024-27917 has a CVSS score of 7.5 (High). The vector is network-reachable, no privileges required, and no user interaction. A CVSS score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether this affects your application depends on whether the vulnerable code is present and reachable in your environment. A fixed version is available (6.5.8.7); upgrading removes the vulnerable code path.

Kodem intelligence

Update to Shopware version 6.5.8.7

1. What is CVE-2024-27917? CVE-2024-27917 is a high-severity security vulnerability in shopware/storefront (composer), affecting versions >= 6.5.8.0, < 6.5.8.7. It is fixed in 6.5.8.7.
2. How severe is CVE-2024-27917? CVE-2024-27917 has a CVSS score of 7.5 (High). This score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether it represents real risk in your environment depends on whether the vulnerable code is present and reachable.
3. Which packages are affected by CVE-2024-27917?
   • shopware/storefront (composer) (versions >= 6.5.8.0, < 6.5.8.7)
   • shopware/platform (composer) (versions >= 6.5.8.0, < 6.5.8.7)
4. Is there a fix for CVE-2024-27917? Yes. CVE-2024-27917 is fixed in 6.5.8.7. Upgrade to this version or later.
5. Is CVE-2024-27917 exploitable, and should I be worried? Whether CVE-2024-27917 is exploitable in your environment depends on whether the vulnerable code is present and reachable. A CVSS score is a worst-case rating; it does not account for your specific deployment, configuration, or usage patterns. Kodem, an Intelligent Application Security platform, uses runtime intelligence to show which vulnerabilities actually execute in production, so you can focus on the ones that represent real risk. Get a demo
6. What actually determines whether CVE-2024-27917 is exploitable, and how bad it is? Exploitability and impact are not fixed properties of a CVE. They depend on runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A high CVSS score on a dependency that never runs is not the same as real risk. Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter.
7. How do I fix CVE-2024-27917?
   • Upgrade shopware/storefront to 6.5.8.7 or later
   • Upgrade shopware/platform to 6.5.8.7 or later