Networknt light-4j from 2.1.5 before 2.4.0 contains an authentication bypass vulnerability in BasicAuthHandler that allows unauthenticated attackers to log in as LDAP/AD-delegated users. Attackers can send a Basic Authorization header with a known username and empty password, triggering an unauthenticated LDAP bind that is accepted as successful authentication.
Attack Parameters
Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Attack Requirements
Present
Additional conditions required
Privileges Required
None
No privileges needed
User Interaction
None
No user interaction needed
Impact Assessment
Confidentiality
High
Complete data leak
Integrity
High
Complete data modification
Availability
None
No disruption
CVSS Vector v4.0
Weakness Type (CWE)
References 7
https://github.com/networknt/light-4j/blob/2.3.7/basic-auth/src/main/java/com/n…
disclosure@vulncheck.com
https://github.com/networknt/light-4j/blob/2.3.7/ldap-util/src/main/java/com/ne…
disclosure@vulncheck.com
https://github.com/networknt/light-4j/commit/54743badb34260b76ed131d8b6a4f60210…
disclosure@vulncheck.com
https://github.com/networknt/light-4j/issues/2804
disclosure@vulncheck.com
https://github.com/networknt/light-4j/pull/2805
disclosure@vulncheck.com
https://github.com/networknt/light-4j/releases/tag/2.4.0
disclosure@vulncheck.com
https://www.vulncheck.com/advisories/networknt-light-4j-2.1.5-before-2.4.0-auth…
disclosure@vulncheck.com