CVE-2016-2403: Unauthorized access on a misconfigured Ldap server when using an empty password

Published May 9, 2016
·
Updated

CVE-2016-2403: Unauthorized access on a misconfigured Ldap server when using an empty password

Other sources

Symfony before 2.8.6 and 3.x before 3.0.6 allows remote attackers to bypass authentication by logging in with an empty password and valid username, which triggers an unauthenticated bind.

Affected Software

28 affected componentsFixes available
composer/symfony/symfony>=2.8.0, <2.8.6, >=3.0.0, <3.0.6
composer/symfony/security-core>=2.8.0, <2.8.6, >=3.0.0, <3.0.6
composer/symfony/security>=2.8.0, <2.8.6, >=3.0.0, <3.0.6
debian/symfony
3.4.22+dfsg-2+deb10u13.4.22+dfsg-2+deb10u24.4.19+dfsg-2+deb11u35.4.23+dfsg-15.4.29+dfsg-15.4.30+dfsg-1
composer/symfony/symfony>=3.0.0<3.0.6
3.0.6
composer/symfony/symfony>=2.8.0<2.8.6
2.8.6
composer/symfony/security>=3.0.0<3.0.6
3.0.6
composer/symfony/security>=2.8.0<2.8.6
2.8.6
composer/symfony/security-core>=3.0.0<3.0.6
3.0.6
composer/symfony/security-core>=2.8.0<2.8.6
2.8.6
SensioLabs Symfony=2.8.0
SensioLabs Symfony=2.8.1
SensioLabs Symfony=2.8.2
SensioLabs Symfony=2.8.3
SensioLabs Symfony=2.8.4
SensioLabs Symfony=2.8.5
SensioLabs Symfony=3.0.0
SensioLabs Symfony=3.0.1
SensioLabs Symfony=3.0.2
SensioLabs Symfony=3.0.3
SensioLabs Symfony=3.0.4
SensioLabs Symfony=3.0.5
composer/symfony/symfony>=2.8.0, <2.8.6
2.8.6
composer/symfony/symfony>=3.0.0, <3.0.6
3.0.6
composer/symfony/security>=2.8.0, <2.8.6
2.8.6
composer/symfony/security>=3.0.0, <3.0.6
3.0.6
composer/symfony/security-core>=2.8.0, <2.8.6
2.8.6
composer/symfony/security-core>=3.0.0, <3.0.6
3.0.6

Remediation

Recommended actions to resolve this vulnerability, in priority order.

  1. Upgrade

    Upgrade debian/symfony to a version that resolves this vulnerability.

    Fixed in 3.4.22+dfsg-2+deb10u1Fixed in 3.4.22+dfsg-2+deb10u2Fixed in 4.4.19+dfsg-2+deb11u3Fixed in 5.4.23+dfsg-1Fixed in 5.4.29+dfsg-1Fixed in 5.4.30+dfsg-1
  2. Upgrade

    Upgrade composer/symfony/symfony to a version that resolves this vulnerability.

    Fixed in 3.0.6
  3. Upgrade

    Upgrade composer/symfony/symfony to a version that resolves this vulnerability.

    Fixed in 2.8.6
  4. Upgrade

    Upgrade composer/symfony/security to a version that resolves this vulnerability.

    Fixed in 3.0.6
  5. Upgrade

    Upgrade composer/symfony/security to a version that resolves this vulnerability.

    Fixed in 2.8.6
  6. Upgrade

    Upgrade composer/symfony/security-core to a version that resolves this vulnerability.

    Fixed in 3.0.6
  7. Upgrade

    Upgrade composer/symfony/security-core to a version that resolves this vulnerability.

    Fixed in 2.8.6
  8. Upgrade

    Upgrade Symfony to a version that resolves this vulnerability.

    Fixed in 2.8.6
  9. Upgrade

    Upgrade Symfony to a version that resolves this vulnerability.

    Fixed in 3.0.6

Event History

May 9, 2016
Advisory Published
via Packagist·09:34 PM
Data Sourced
via Packagist·09:34 PM
DescriptionSeverityAffected Software
Advisory Published
09:35 PM
Feb 7, 2017
CVE Published
via MITRE·05:00 PM
Data Sourced
via MITRE·05:00 PM
Description
Data Sourced
via NVD·05:59 PM
DescriptionSeverityWeaknessAffected Software

Frequently Asked Questions

1

What is the severity of CVE-2016-2403?

CVE-2016-2403 is classified as a critical vulnerability due to its potential to allow unauthorized access.

2

How do I fix CVE-2016-2403?

To remediate CVE-2016-2403, upgrade Symfony to version 2.8.6 or 3.0.6 or later.

3

What versions are affected by CVE-2016-2403?

CVE-2016-2403 affects Symfony versions 2.8.0 through 2.8.6 and 3.0.0 through 3.0.6.

4

What kind of security risk does CVE-2016-2403 present?

CVE-2016-2403 presents a security risk of unauthorized access, allowing attackers to authenticate with empty passwords.

5

Is CVE-2016-2403 specific to any web framework?

Yes, CVE-2016-2403 specifically affects the Symfony framework versions mentioned.

Company

Resources

Contact

SecAlerts Pty Ltd.
132 Wickham Terrace
Fortitude Valley,
QLD 4006, Australia
info@secalerts.co
By using SecAlerts services, you agree to our services end-user license agreement. This website is safeguarded by reCAPTCHA and governed by the Google Privacy Policy and Terms of Service. All names, logos, and brands of products are owned by their respective owners, and any usage of these names, logos, and brands for identification purposes only does not imply endorsement. If you possess any content that requires removal, please get in touch with us.
© 2026 SecAlerts Pty Ltd.
ABN: 70 645 966 203, ACN: 645 966 203