Security Digest · Critical advisory (no CVE assigned)
GHSA-qm5c-m76r-2hfr: Laravel RCE vulnerability in "cookie" session driver
Applications using the "cookie" session driver that were also exposing an encryption oracle via their application were vulnerable to remote code execution.
CVSS 9.9 Critical GitHub-reviewed · critical
Should you act?
- Only if you depend on one of the packages below, directly or transitively, in a vulnerable version. Check your lockfile with
composer audit. - No CVE has been assigned, so it will not appear in CVE-based scanners that ignore GitHub advisories.
npm audit,pip-auditand Dependabot do read GitHub advisories.
Affected packages
| Ecosystem | Package | Vulnerable | First fixed |
|---|---|---|---|
| Composer (PHP) | laravel/framework | >= 4.1.0, < 6.18.31 | 6.18.31 |
| Composer (PHP) | laravel/framework | >= 7.0.0, < 7.22.4 | 7.22.4 |
Details
Applications using the "cookie" session driver that were also exposing an encryption oracle via their application were vulnerable to remote code execution. An encryption oracle is a mechanism where arbitrary user input is encrypted and the encrypted string is later displayed or exposed to the user. This combination of scenarios lets the user generate valid Laravel signed encryption strings for any plain-text string, thus allowing them to craft Laravel session payloads when an application is using the "cookie" driver.
CVSS: 9.9 (v3.1) CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Sources and references
- GitHub Advisory GHSA-qm5c-m76r-2hfr github.com
- blog.laravel.com blog.laravel.com
- github.com github.com
Critical Composer (PHP) advisories · Today’s Security Digest