CVE intelligence and bounded remediation

CVE-2021-42853 — Riverbed Steelcentral Appinternals Dynamic Sampling Agent security vulnerability

Critical CVSS 9.8

It was discovered that the SteelCentral AppInternals Dynamic Sampling Agent's (DSA) AgentDiagnosticServlet has directory traversal vulnerability at the "/api/appInternals/1.0/agent/diagnostic/logs" API. The affected endpoint does not have any input validation of the user's input that allows a malicious payload to be injected.

Severity
Critical
CVSS
9.8 (3.1)
Published
2022-03-10
CISA KEV
Not currently listed
Ecosystem
software/application
Weaknesses
CWE-20, CWE-22

Affected products

  • riverbed / steelcentral_appinternals_dynamic_sampling_agent
  • riverbed / steelcentral_appinternals_dynamic_sampling_agent / 10.0.0

Showing 2 representative product identities from 3 source matches. Confirm exact affected versions with the linked vendor and NVD evidence.

Matched remediation archetype

Path traversal, unsafe upload, and file handling

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Check exposure

  • Trace untrusted filenames, archive entries, URLs, and path segments into read, write, include, extraction, and upload operations.
  • Identify filesystem roots, mount permissions, symbolic-link behavior, archive handling, and whether uploaded content is web-accessible or executable.
  • Review canonicalization and containment checks across supported operating systems and storage backends.

Remediate safely

  • Generate server-side storage identifiers and resolve paths beneath a fixed root using filesystem-aware containment checks.
  • Reject absolute, parent-relative, alternate-separator, device, link, and archive entries that escape the intended root.
  • Store uploads outside executable or served paths, validate type and size, and use private atomic temporary files.

Authoritative sources

Complete CVE record and remediation plan

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