CVE-2023-27372
Published: 28 February 2023
Summary
CVE-2023-27372 is a critical-severity Deserialization of Untrusted Data (CWE-502) vulnerability in Spip Spip. Its CVSS base score is 9.8 (Critical).
Operationally, ranked in the top 0.2% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog; a public proof-of-concept is referenced.
Deeper analysis
SPIP versions prior to 4.2.1 contain a remote code execution vulnerability stemming from improper handling of serialized data in form inputs processed within the public-facing area of the application. The flaw is tracked under CWE-502 and carries a CVSS 3.1 base score of 9.8, reflecting network-accessible exploitation without authentication or user interaction. Affected releases include all branches before the listed fixes of 3.2.18, 4.0.10, 4.1.8, and 4.2.1.
Unauthenticated attackers can submit crafted form values to trigger unsafe deserialization, resulting in arbitrary code execution on the server with the privileges of the web application process. This grants full control over confidentiality, integrity, and availability of the SPIP instance and any hosted data or connected systems.
The SPIP project published a critical security advisory and corresponding Git commits that restore safe serialization handling; administrators are advised to upgrade immediately to one of the patched releases. Public exploit code has been posted to Packet Storm for both the original disclosure and subsequent variants.
The CVE maintains a very high EPSS score with a recorded peak of 0.9734, indicating sustained and widespread exploitation interest following public disclosure.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2023-31148
Vulnerability details
SPIP before 4.2.1 allows Remote Code Execution via form values in the public area because serialization is mishandled. The fixed versions are 3.2.18, 4.0.10, 4.1.8, and 4.2.1.
- CWE(s)
Related Threats
No named actor attribution yet. ATT&CK technique mapping in progress for this CVE.
Affected Assets
Mitigating Controls
Likely Mitigating Controls AI
Per-CVE control mapping for this CVE has not run yet; the list below is derived from the weakness types (CWEs) cited in the NVD entry.
Penetration testing supplies malicious serialized objects, detecting unsafe deserialization and supporting corrective actions.
Evaluation of untrusted data handling (deserialization testing) reveals unsafe processing, which the required remediation process addresses.
Untrusted serialized data can be deserialized and observed inside the chamber, blocking gadget-chain exploitation outside the sandbox.
Validates or rejects untrusted serialized data before deserialization occurs.
Identifies and blocks malicious code introduced through deserialization of untrusted data at system boundaries.
Integrity verification of serialized information can detect tampering before deserialization occurs.
Provenance of associated data allows detection of untrusted sources before deserialization or processing occurs.