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Steelcentral Appinternals Dynamic Sampling AgentApplication · Riverbed

CVE-2021-42787

CRITICAL · 9.8 CVSS v3.1 Published 2022-03-10
Fix available
A fix is available. Upgrade to 11.8.8 / 12.13.0 or later.
See remediation →
100/100
Remediation priority · Urgent
Remotely reachable No privileges Zero-click

Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.

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

Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.

dbcve analysis · moderate confidence

The SteelCentral AppInternals Dynamic Sampling Agent's AgentConfigurationServlet contains a path traversal vulnerability at the /api/appInternals/1.0/agent/configuration API endpoint. Due to the absence of input validation on user-supplied parameters, an attacker can inject path traversal sequences (e.g., ../) to read or write files outside the intended web root directory, potentially leading to arbitrary file access or remote code execution.

MitigationImplement strict input validation and sanitization on the affected endpoint to reject path traversal characters and validate all file paths against an allowed whitelist or root directory. Apply proper file access controls and consider restricting the API to authenticated users only.

Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.

Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.

NVD · CPE data
Steelcentral Appinternals Dynamic Sampling AgentApplication
Affected:>= 11.0.0, < 11.8.8>= 12.0.0, < 12.13.0= 10.0.0

CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.

From the vector
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.

dbcve checks

Work through these to decide whether this CVE applies to you.

  1. Identify if SteelCentral AppInternals Dynamic Sampling Agent is installed
    Look for the agent process running on the system (process name may contain 'appinternals', 'dsagent' or similar) or check for installation directories containing 'SteelCentral' or 'AppInternals' in the name
    Affected if The agent software is present on the system
  2. Determine the installed agent version
    Check the agent's version information - typically available via the agent's service properties, a version file in the installation directory, or by querying the agent via its management API if accessible
    Affected if The installed version falls within 10.0.0, or >= 11.0.0 and < 11.8.8, or >= 12.0.0 and < 12.13.0
  3. Test for path traversal vulnerability
    Send a crafted request to the /api/appInternals/1.0/agent/configuration endpoint with path traversal sequences in parameters (e.g., ../../../etc/passwd or ../../../config) and observe if the response reveals file contents outside the web root
    Affected if The API returns file contents from outside the intended directory or allows writing files to arbitrary locations

If the SteelCentral AppInternals Dynamic Sampling Agent is installed and the version falls within 10.0.0, >= 11.0.0 to < 11.8.8, or >= 12.0.0 to < 12.13.0, and the vulnerable API endpoint is accessible, the environment is affected by this path traversal vulnerability.

Generated from the published advisory. Verify against your own configuration.

Check your environment

Paste your version and any relevant configuration and it will be compared against the affected criteria above. Do not include secrets or credentials.

AI-assisted, checked against the advisory. Informational, not a guarantee.

Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.

dbcve · scoped
Upgrade available Upgrade to 11.8.8 / 12.13.0 or later
Fixed in 11.8.812.13.0
Interim mitigation

Implement strict input validation and sanitization on the affected endpoint to reject path traversal characters and validate all file paths against an allowed whitelist or root directory. Apply proper file access controls and consider restricting the API to authenticated users only.

Recommended fix High confidence

Upgrade to SteelCentral AppInternals Dynamic Sampling Agent 11.8.8 (for 11.x branch) or 12.13.0 (for 12.x branch), or later

  1. 1. Identify all SteelCentral AppInternals Dynamic Sampling Agent installations in your environment and note their current versions
  2. 2. For agents running version 10.0.0: upgrade to version 11.8.8 or later (preferably 12.13.0 or later)
  3. 3. For agents running version 11.0.0 through 11.8.7: upgrade to version 11.8.8
  4. 4. For agents running version 12.0.0 through 12.12.x: upgrade to version 12.13.0
  5. 5. After upgrading, verify the AgentConfigurationServlet endpoint no longer accepts directory traversal payloads
  6. 6. Test that the agent continues to function properly after the upgrade

Generated from the published advisory — verify against the referenced sources before acting.

Fix this in Steelcentral Appinternals Dynamic Sampling Agent Scoped from the published advisory
  • Consultation3.0 h
  • Implementation6.0 h
  • Testing4.0 h
  • Review / QA2.0 h
15.0 hours of engineering $2,640
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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2021-42787 in production — separate from our analysis above.

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What this is

A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.

What belongs here
  • Verified mitigations, workarounds, and config changes
  • Version or environment caveats, and links to real fixes
  • No weaponised exploit code, or anything meant to cause harm
  • No spam, self-promotion, credentials, or personal data