dbcve.org
Active Backup For Business AgentApplication · Synology

CVE-2023-52949

MEDIUM · 5.5 CVSS v3.1 Published 2024-09-26
Fix available
A fix is available. Upgrade to 2.7.0-3221 or later.
See remediation →
57/100
Remediation priority · Elevated
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
Missing authentication for critical function vulnerability in proxy settings functionality in Synology Active Backup for Business Agent before 2.7.0-3221 allows local users to obtain user credential via unspecified vectors.

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

Synology Active Backup for Business Agent before version 2.7.0-3221 contains a missing authentication vulnerability in its proxy settings functionality. This allows local users to access the proxy settings without authentication and obtain user credentials that may be stored or transmitted through the proxy configuration. The vulnerability has a CVSS vector indicating local attack vector (AV:L) and requires low privileges (PR:L).

MitigationUpdate Synology Active Backup for Business Agent to version 2.7.0-3221 or later to remediate the missing authentication vulnerability. Verify that proxy settings do not contain plaintext credentials and consider rotating any credentials that may have been exposed.

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
Active Backup For Business AgentApplication
Affected:< 2.7.0-3221

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
Local
Complexity
Low
Privileges
Low
User interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
None

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

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 Synology Active Backup for Business Agent is installed
    Check the system for the presence of Synology Active Backup for Business Agent. Look in installed programs list on Windows or check for the application bundle on the system.
    Affected if The agent is installed on the system.
  2. Determine the installed version of the Synology Active Backup for Business Agent
    Access the agent's UI or use command line tools to retrieve the version information. Common locations include the application properties, help about section, or registry entries under HKLM\Software\Synology\ActiveBackupForBusiness or similar paths.
    Affected if The installed version is lower than 2.7.0-3221.
  3. Locate and inspect proxy configuration files or settings
    Access the proxy settings functionality within the Synology Active Backup for Business Agent interface or examine configuration files stored in the agent's data directory.
    Affected if Proxy settings are configured or accessible through the agent.
  4. Check for stored credentials in proxy configuration
    Examine the proxy settings for any stored usernames, passwords, or authentication tokens. These may appear in configuration files, registry entries, or within the agent's stored settings.
    Affected if Proxy settings contain plaintext or encoded credentials that could be accessed without authentication.

The environment is affected if Synology Active Backup for Business Agent version is below 2.7.0-3221 and proxy settings with credentials are accessible without authentication.

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 2.7.0-3221 or later
Fixed in 2.7.0-3221
Interim mitigation

Update Synology Active Backup for Business Agent to version 2.7.0-3221 or later to remediate the missing authentication vulnerability. Verify that proxy settings do not contain plaintext credentials and consider rotating any credentials that may have been exposed.

Recommended fix High confidence

Active Backup for Business Agent version 2.7.0-3221

  1. Navigate to the Synology download center and locate Active Backup for Business Agent
  2. Download the latest version 2.7.0-3221 or later from the official Synology website
  3. Ensure you have a backup of any critical configuration data for the Active Backup for Business Agent
  4. Close any running instances of the Active Backup for Business Agent
  5. Run the installer and follow the on-screen prompts to upgrade the agent to version 2.7.0-3221
  6. After installation, verify the installed version matches 2.7.0-3221 or later in the agent's about or system information section

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

Fix this in Active Backup For Business Agent Scoped from the published advisory
  • Consultation2.0 h
  • Implementation4.0 h
  • Testing3.0 h
  • Review / QA1.0 h
10.0 hours of engineering $1,750
Get the upgrade done

An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $2,800.

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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-2023-52949 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