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RconfigApplication

CVE-2020-12258

CRITICAL · 9.1 CVSS v3.1 Published 2020-05-18
Mitigation only
No fix yet — a mitigation exists. There is no fixed release. A documented workaround reduces exposure in the meantime.
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
rConfig 3.9.4 is vulnerable to session fixation because session expiry and randomization are mishandled. The application can reuse a session via PHPSESSID. Also, an attacker can exploit this vulnerability in conjunction with CVE-2020-12256 or CVE-2020-12259.

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

rConfig 3.9.4 contains a session fixation vulnerability where session expiry is not properly enforced and session IDs (PHPSESSID) are not adequately randomized, allowing attackers to reuse or pre-determine session tokens. This can be chained with other CVEs for escalated attacks.

MitigationImplement proper session management: regenerate session IDs on authentication, enforce session expiration policies, and ensure cryptographically secure session ID generation.

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
RconfigApplication
Affected:= 3.9.4

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
None

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/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. Confirm rConfig version
    Locate the version file or admin interface footer that displays the installed rConfig version number
    Affected if The installed version is exactly 3.9.4
  2. Inspect PHP session configuration
    Check the PHP configuration file (php.ini) or runtime settings for session.use_strict_mode, session.use_only_cookies, and session.cookie_httponly directives
    Affected if session.use_strict_mode is disabled or session.use_only_cookies is disabled
  3. Verify session ID regeneration on login
    Examine the login authentication code to determine whether session_regenerate_id() is called upon successful login
    Affected if Session IDs are not regenerated after successful authentication (session_regenerate_id is absent or not called)
  4. Check session expiry enforcement
    Review session configuration for session.gc_maxlifetime and session.cookie_lifetime settings, and inspect session management code for expiration logic
    Affected if Session expiry is not enforced (gc_maxlifetime is excessively long or no timeout logic exists)

A defender is affected if they are running rConfig version 3.9.4 and the session configuration lacks proper ID regeneration, strict mode, and expiration enforcement.

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
Mitigation available No clean upgrade yet — mitigate in the meantime
Mitigation

Implement proper session management: regenerate session IDs on authentication, enforce session expiration policies, and ensure cryptographically secure session ID generation.

Recommended fix Moderate confidence

rConfig 3.9.5 or later stable release

  1. 1. Backup your current rConfig installation and database before making any changes
  2. 2. Identify your current rConfig version by checking the version file or admin interface
  3. 3. Download the latest stable version of rConfig from the official repository or website
  4. 4. Replace the existing rConfig files with the new version, preserving your configuration and database connection settings
  5. 5. Clear all existing PHP sessions by deleting session files from the server's session directory (typically /var/lib/php/sessions or similar)
  6. 6. Test the application to ensure functionality is preserved after upgrade
  7. 7. Verify the session fixation vulnerability is resolved by confirming sessions are properly regenerated on login
Caveat Review release notes for any breaking changes between 3.9.4 and the target version, particularly regarding PHP version compatibility requirements

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

Fix this in Rconfig Scoped from the published advisory
  • Consultation3.0 h
  • Implementation6.0 h
  • Testing3.0 h
  • Review / QA2.0 h
14.0 hours of engineering $2,490
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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-2020-12258 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
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  • Version or environment caveats, and links to real fixes
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