CVE-2021-21342
Published: 23 March 2021
Summary
CVE-2021-21342 is a medium-severity Deserialization of Untrusted Data (CWE-502) vulnerability in Oracle Communications Unified Inventory Management. Its CVSS base score is 5.3 (Medium).
Operationally, ranked in the top 24.4% 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-2021-0673
Vulnerability details
XStream is a Java library to serialize objects to XML and back again. In XStream before version 1.4.16, there is a vulnerability where the processed stream at unmarshalling time contains type information to recreate the formerly written objects. XStream creates…
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therefore new instances based on these type information. An attacker can manipulate the processed input stream and replace or inject objects, that result in a server-side forgery request. No user is affected, who followed the recommendation to setup XStream's security framework with a whitelist limited to the minimal required types. If you rely on XStream's default blacklist of the Security Framework, you will have to use at least version 1.4.16.
- 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 attempts server-side requests to internal resources, identifying SSRF weaknesses for remediation.
Validates server-side URLs and resource references to block SSRF attempts.
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.
Outbound connections to external resources can be monitored and limited at the boundary, reducing SSRF impact.
Identifies and blocks malicious code introduced through deserialization of untrusted data at system boundaries.
Detects server-side request forgery through monitoring of unexpected outbound connections.
Integrity verification of serialized information can detect tampering before deserialization occurs.