So Freund, wir sind wieder online. Wieso wieder Online fragt Ihr, na wegen PHP2SHELL !
PHP Apocalypse abgewendet
PHP hat zwar früher als erwartet das Embargo für die PHP Patche freigegeben, aber dank eines Geniestreichs, waren unsere Server schneller wieder am Netz als andere, denn die Mirrors der Updatepakete waren nicht aktuell. Hätte man auf die gewartet, hätte es Stunden dauern können.
Was ist überhaupt passiert:
Security advisory: Critical remote code execution vulnerabilities, update now
PHP 8.5.12, 8.4.27, 8.3.36 and 8.2.35 fix two critical vulnerabilities that can allow unauthenticated remote code execution. All PHP users are strongly encouraged to update immediately.
Who is at risk: all PHP installations serving web requests, including PHP-FPM, Apache with mod_php, php-cgi, FrankenPHP and LiteSpeed. We consider the risk highest for mod_php, with a demonstrated exploit where an unauthenticated request can trigger the attack before any application code runs.
The vulnerabilities:
- RCE via OOM corruption, CVE-2026-109618 (GHSA-w8hw-w9fx-j79w): out-of-memory handling can interrupt PHP while internal request data is only partially initialized. Request cleanup may then treat the invalid data as valid.
- RCE via stale global state, CVE-2026-109619 (GHSA-6wmf-4rv5-p3rp): request-owned internal state can survive after its backing memory has been freed. A later request handled by the same worker may use that stale state before normal initialization resets it.
How to update:
- Update to PHP 8.5.12, 8.4.27, 8.3.36 or 8.2.35. Source downloads are on our downloads page. Windows source and binaries are on the same page.
- Linux distributions and LTS vendors received the patches in advance, so check your vendor for updated packages.
- PHP 8.1 and older no longer receive updates from the PHP project. Some distributions and LTS vendors provide backported fixes, so contact your vendor for details, or upgrade to a supported version.
- If you rely on the volunteer-maintained
rpms.remirepo.net, we urge you to switch to distribution packages or build from source, so you can immediately apply updates. The repo will not have updates today.- Given the severity of these vulnerabilities, the PHP security team provided minimal source-backports for PHP 7.4, PHP 8.0, and PHP 8.1 to help people building from source or without access to an LTS vendor.
If you cannot update immediately: while only an update is a complete solution, the following measures reduce exposure to specific attack paths but do not make an installation safe.
RCE via OOM corruption (CVE-2026-109618):
- Set
memory_limit=-1, preferably in a way applications can’t override, such asphp_admin_valuein the FPM pool or Apache configuration, and check that no pool, directory or application setting puts a finite limit back. This removes the controllable PHP memory limit failure, but an underlying allocation failure can still reach the vulnerable path.- Set a low
post_max_size. For applications that don’t require file uploads, setpost_max_size = 8M. If file uploads are necessary, setpost_max_size = 32M. Keepupload_max_filesizebelowpost_max_size. Consider enforcing limits at the web server or proxy level for decoded request size, input field count, multipart part count, header count, and nesting depth. These limits must also cover requests without a usableContent-Length.- Use a container or cgroup limit as an availability boundary, preferably with a policy that kills only the affected worker. Do not substitute
RLIMIT_ASorRLIMIT_DATA, as these can cause the vulnerable allocation failure.RCE via stale global state (CVE-2026-109619):
- Set
session.upload_progress.enabled=0and restart every worker. Usephp.ini, an FPM pool or server configuration that applies before request parsing. Do not rely onini_set()or FPM.user.ini. This blocks the confirmed session paths but not other variants.- On PHP 8.5, set
fatal_error_backtraces=0and restart every worker. This blocks the confirmed fatal backtrace path only.- Remove invalid or deprecated settings applied per request that emit diagnostics before initialization. Hiding diagnostics with
error_reporting,display_errorsor@does not help.- Fix attacker-reachable fatal errors and execution timeouts, including failures in callbacks, upload or import processing and cleanup.
The advisories linked above have the full technical details.
Quelle: php.net
Da 24h Zeit waren wurden heute Mittag im Geheimen bereits das Update für Fedora kompiliert. Daher konnte man die Pakete bereits früher haben als die Mirrors. Letztendlich wurden die dann über unsere Updateserver verteilt, so daß alle unsere Server das für ein normales Update wie jedes andere behandelt haben.
