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AllegraApplication · Alltena

CVE-2023-51642

MEDIUM · 6.3 CVSS v3.1 Published 2024-11-22
Fix available
A fix is available. Upgrade to 7.5.1 or later.
See remediation →
69/100
Remediation priority · Elevated
Remotely reachable 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
Allegra loadFieldMatch Deserialization of Untrusted Data Remote Code Execution Vulnerability. This vulnerability allows remote attackers to execute arbitrary code on affected installations of Allegra. Although authentication is required to exploit this vulnerability, product implements a registration mechanism that can be used to create a user with a sufficient privilege level. The specific flaw exists within the loadFieldMatch method. The issue results from the lack of proper validation of user-supplied data, which can result in deserialization of untrusted data. An attacker can leverage this vulnerability to execute code in the context of LOCAL SERVICE. Was ZDI-CAN-22506.

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 deserialization vulnerability exists in Allegra's loadFieldMatch method where insufficient validation of user-supplied data allows remote attackers to deserialize untrusted data. Although authentication is required, the product's self-registration mechanism can create users with the necessary privileges, enabling authenticated RCE in the context of LOCAL SERVICE.

MitigationImplement strict input validation on the loadFieldMatch method to ensure only properly validated, expected data types are deserialized. Alternatively, disable the registration mechanism or enforce admin approval for new accounts to prevent unauthorized access.

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
AllegraApplication
Affected:< 7.5.1

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
Low
User interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
Low
Availability
Low

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/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. Check installed Allegra version
    Locate the Allegra application version through the admin interface (typically in About or System Info section), or check version metadata in the installation directory
    Affected if Version is below 7.5.1 (any version < 7.5.1 is affected)
  2. Verify self-registration mechanism status
    Access the system configuration or security settings in the Allegra admin panel and verify whether user self-registration is enabled for public users
    Affected if Self-registration is enabled - this allows attackers to create accounts with the privileges needed to exploit the deserialization flaw
  3. Confirm loadFieldMatch method accessibility
    Identify if the loadFieldMatch API endpoint or method is exposed and accessible to authenticated users through the web interface or API
    Affected if The loadFieldMatch method is accessible to non-admin authenticated users
  4. Audit user accounts for unauthorized registrations
    Review the user management panel to list all registered accounts and check for any unexpected or unknown user accounts that may indicate exploitation
    Affected if Unexpected user accounts exist, especially those with elevated privileges

The environment is affected if Allegra version is below 7.5.1 and self-registration is enabled, allowing unauthenticated attackers to create accounts and trigger the deserialization vulnerability in loadFieldMatch.

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 7.5.1 or later
Fixed in 7.5.1
Interim mitigation

Implement strict input validation on the loadFieldMatch method to ensure only properly validated, expected data types are deserialized. Alternatively, disable the registration mechanism or enforce admin approval for new accounts to prevent unauthorized access.

Recommended fix Moderate confidence

Allegra version 7.5.1

  1. Identify current Allegra installation version
  2. Verify current version is below 7.5.1
  3. Backup the Allegra database and configuration files
  4. Download Allegra version 7.5.1 or later from the official vendor website (www.trackplus.com)
  5. Stop the Allegra service
  6. Install the version 7.5.1 update
  7. Restart the Allegra service
  8. Verify the application is functioning correctly post-upgrade

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

Fix this in Allegra Scoped from the published advisory
  • Consultation2.0 h
  • Implementation4.0 h
  • Testing3.0 h
  • Review / QA2.0 h
11.0 hours of engineering $1,930
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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-2023-51642 in production — separate from our analysis above.

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What this is

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What belongs here
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  • Version or environment caveats, and links to real fixes
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