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CRITICAL severity

Laravel RCE vulnerability in "cookie" session driverGHSA-qm5c-m76r-2hfr

CRITICAL

GHSA-qm5c-m76r-2hfr is a critical-severity (CVSS 9.9) remote code execution vulnerability in laravel/framework. A fix is available for laravel/framework — see the affected versions and patch details below.

Published
Updated
Affected
2 pkgs
Patched
2 / 2
Exploits
None indexed
Exploitation data as of Nov 29, 2024 · OSV.dev, FIRST.org (EPSS)

Real-World Exposure

2 pkgs affected
🐘laravel/framework🐘laravel/framework

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects Packagist packages — download data is not available via public APIs for these ecosystems.

Description

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.

Affected Packages

2 total 2 fixed
EcosystemPackageVulnerable rangeFix
🐘Packagistlaravel/framework≥ 4.1.0&&< 6.18.316.18.31composer require laravel/framework:^6.18.31
🐘Packagistlaravel/framework≥ 7.0.0&&< 7.22.47.22.4composer require laravel/framework:^7.22.4

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for laravel/framework, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update laravel/framework to 6.18.31 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-qm5c-m76r-2hfr is resolved across your whole dependency graph.

  3. Workarounds

    If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.

Frequently Asked Questions

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.
O3 Security · Impact-Aware SCA

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Laravel RCE vulnerability in "cookie" session driver