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Sphere ImagebackendApplication · Sphere Imagebackend Project

CVE-2022-31561

CRITICAL · 9.3 CVSS v3.1 Published 2022-07-11
Fix available
A fix is available. Upgrade to after 2019-10-03 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
The varijkapil13/Sphere_ImageBackend repository through 2019-10-03 on GitHub allows absolute path traversal because the Flask send_file function is used unsafely.

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 · high confidence

A path traversal vulnerability exists in the varijkapil13/Sphere_ImageBackend Flask application where the send_file function is used without proper input validation, allowing attackers to access arbitrary files on the server by manipulating file path parameters.

MitigationReplace unsafe send_file usage with secure path handling: either use Flask's safe_join() function to validate paths stay within an allowed directory, or implement strict input validation to prevent directory traversal sequences (../) and ensure only intended files within a controlled directory can be served.

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
Sphere ImagebackendApplication
Affected:<= 2019-10-03

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
Changed
Confidentiality
High
Integrity
None
Availability
Low

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

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. Locate the Sphere ImageBackend application
    Search your environment for files or directories named 'Sphere_ImageBackend', 'Sphere ImageBackend', or the varijkapil13 repository structure
    Affected if The application is present in your environment
  2. Determine the application version or deployment date
    Check the application's version metadata, commit history, or deployment timestamp against the affected version dated 2019-10-03 or earlier
    Affected if The deployed version is from 2019-10-03 or earlier or has no version available after that date
  3. Inspect the source code for send_file usage
    Examine the Flask application source files for calls to flask.send_file() that accept user-controlled file path parameters without validation
    Affected if The code contains send_file() calls that use path parameters directly from requests without sanitization
  4. Verify input validation is missing
    Search the codebase for safe_join() usage, os.path.abspath() validation, or explicit '../' filtering in the file serving logic
    Affected if No path validation mechanism such as safe_join() is found before send_file() is called
  5. Check the application's exposure
    Review the Flask route handlers that serve files and determine if they are accessible to untrusted users or network callers
    Affected if The vulnerable file serving endpoint is exposed to untrusted or public access

Your environment is affected if you have deployed the Sphere ImageBackend application at version 2019-10-03 or earlier and the codebase contains send_file() calls serving user-supplied paths without safe_join() or equivalent validation.

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 a release after 2019-10-03
Interim mitigation

Replace unsafe send_file usage with secure path handling: either use Flask's safe_join() function to validate paths stay within an allowed directory, or implement strict input validation to prevent directory traversal sequences (../) and ensure only intended files within a controlled directory can be served.

Recommended fix Moderate confidence

Latest available version/commit after 2019-10-03 from the Sphere_ImageBackend repository

  1. 1. Navigate to the project repository at github.com/varijkapil13/Sphere_ImageBackend
  2. 2. Check the repository for any security commits or patches addressing the path traversal vulnerability in Flask's send_file usage
  3. 3. Identify the latest commit or release after 2019-10-03 that contains the fix
  4. 4. Update the local codebase to the fixed commit or release version
  5. 5. Verify the fix by reviewing the code changes to ensure send_file is now used safely with proper path validation
  6. 6. Test the application to confirm the path traversal vulnerability is resolved

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

Fix this in Sphere Imagebackend Scoped from the published advisory
  • Consultation3.0 h
  • Implementation4.0 h
  • Testing3.0 h
  • Review / QA2.0 h
12.0 hours of engineering $2,130
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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-2022-31561 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