Flash Report: Spring4Shell

TLP: WHITE

In this briefing, ZeroFox Intelligence provides information on Spring4Shell (CVE-2022-22965), a vulnerability within the Spring Core Framework that could enable remote code execution.

Standing Intelligence Requirements

VULN

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Link to Download

https://zf-dashboard-media.s3.amazonaws.com/intel/40720ca6-1b71-48d0-b858-fd9e73a49f83/ZeroFox+Flash+Report+-+Spring4Shell.pdf

Scope Note

ZeroFox Intelligence is derived from a variety of sources, including—but not limited to—curated open-source accesses, vetted social media, proprietary data sources, and direct access to threat actors and groups through covert communication channels. Information relied upon to complete any report cannot always be independently verified. As such, ZeroFox applies rigorous analytic standards and tradecra in accordance with best practices and includes caveat language and source citations to clearly identify the veracity of our Intelligence reporting and substantiate our assessments and recommendations. All sources used in this particular Intelligence product were identified prior to 9:00 AM (EDT) on April 1, 2022; per cyber hygiene best practices, caution is advised when clicking on any third-party links.

Key Findings

A zero-day vulnerability dubbed “Spring4Shell” enables remote code execution in the Spring Core Framework.
The vulnerability impacts Spring Model-View-Controller (MVC) and Spring WebFlux applications running with certain configurations.
The vulnerability, now tracked as CVE-2022-22965, is caused by unsafe deserialization of passed arguments.
Patches have been released to address vulnerabilities in versions of Spring Framework (5.3.18 and 5.2.20) and Spring Boot (2.5.12 and 2.6.6)