CVE-2021-39151
Published: 23 August 2021
Summary
CVE-2021-39151 is a high-severity Unrestricted Upload of File with Dangerous Type (CWE-434) vulnerability in Oracle Utilities Framework. Its CVSS base score is 8.5 (High).
Operationally, ranked in the top 29.3% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog; a public proof-of-concept is referenced.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2021-1751
Vulnerability details
XStream is a simple library to serialize objects to XML and back again. In affected versions this vulnerability may allow a remote attacker to load and execute arbitrary code from a remote host only by manipulating the processed input stream.…
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No user is affected, who followed the recommendation to setup XStream's security framework with a whitelist limited to the minimal required types. XStream 1.4.18 uses no longer a blacklist by default, since it cannot be secured for general purpose.
- 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.
Untrusted serialized data can be deserialized and observed inside the chamber, blocking gadget-chain exploitation outside the sandbox.
Scans files from external sources on download/open/execute, blocking unrestricted uploads of dangerous file types.
Penetration testing supplies malicious serialized objects, detecting unsafe deserialization and supporting corrective actions.
Requiring identifiable owners for portable devices reduces the attack surface for unrestricted uploads of dangerous file types via anonymous media.
Evaluation of untrusted data handling (deserialization testing) reveals unsafe processing, which the required remediation process addresses.
Prevents unrestricted writing of arbitrary or malicious firmware by keeping hardware write-protect enabled except under tightly controlled manual procedures.
Validates or rejects untrusted serialized data before deserialization occurs.
Integrity verification of serialized information can detect tampering before deserialization occurs.