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8.1

Graylog before 3.3.3 allows interception of user authentication

CVE-2020-15813 · published 6 years ago
Summary

If an attacker can intercept Graylog's connection to your LDAP server, they can trick Graylog into using a fake server, bypassing user authentication. This is a risk if you're using LDAP to manage user access to your Graylog system. Update to version 3.3.3 or later to fix this issue.

What to do
  • Update graylog org.graylog:graylog-parent to version 3.3.3.
  • Update graylog graylog to version 3.3.3 or later.
Affected software
Ecosystem VendorProductAffected versions
maven graylog org.graylog:graylog-parent < 3.3.3
Fix: upgrade to 3.3.3
– graylog graylog < 3.3.3
cpe:2.3:a:graylog:graylog:*:*:*:*:*:*:*:*
Original advisory text
Graylog before 3.3.3 lacks SSL Certificate Validation for LDAP servers. It allows use of an external user/group database stored in LDAP. The connection configuration allows the usage of unencrypted...
Graylog before 3.3.3 lacks SSL Certificate Validation for LDAP servers. It allows use of an external user/group database stored in LDAP. The connection configuration allows the usage of unencrypted, SSL- or TLS-secured connections. Unfortunately, the Graylog client code (in all versions that support LDAP) does not implement proper certificate validation (regardless of whether the "Allow self-signed certificates" option is used). Therefore, any attacker with the ability to intercept network traffic between a Graylog server and an LDAP server is able to redirect traffic to a different LDAP server (unnoticed by the Graylog server due to the lack of certificate validation), effectively bypassing Graylog's authentication mechanism.
References
Fix within
Internet-facing 3 days
Internal 60 days
  • Not known to be exploited
  • Can be exploited automatically (estimated)
  • Gives an attacker full control (estimated)
Severity
8.1 High
Exploitation
<1% chance of attack within 30 days
Type
CWE-295Improper Certificate Validation
Timeline
Published17 Jul 2020
Updated4 Nov 2026
First seen6 Mar 2026
Sources
GHSA-3gg9-f3vh-866f · GHSA
CVE-2020-15813 · NVD
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