CVE-2017-8028: Spring-LDAP authentication with userSearch and STARTTLS allows authentication with arbitrary password

HIGH | OCTOBER 16, 2017 | CVE-2017-8028

Description

When connected to some LDAP servers, when no additional attributes are bound, and when using LDAP BindAuthenticator with org.springframework.ldap.core.support.DefaultTlsDirContextAuthenticationStrategy as the authentication strategy, and setting userSearch, authentication is allowed with an arbitrary password when the username is correct. This occurs because some LDAP vendors require an explicit operation for the LDAP bind to take effect.

Affected Spring Products and Versions

Spring-LDAP versions 1.3.0 - 2.3.1

Mitigation

Users of affected versions should apply the following mitigation:

Upgrade to Spring-LDAP version 2.3.2.RELEASE+

Credit

This vulnerability was responsibly reported by Tobias Schneider.

History

2017-10-16: Initial vulnerability report published

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