pac4j-saml before 6.5.6 does not require signature validation of SAML LogoutRequest messages in SAML2LogoutValidator.validateLogoutRequest(). When an IdP sends no SessionIndex, a session can be destroyed based solely on the NameID, allowing an unauthenticated attacker to submit an unsigned LogoutRequest with a guessed identifier (e.g., an email address used as NameID) to terminate a victim's SAML session.
Attack Parameters
Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Attack Requirements
None
No additional conditions
Privileges Required
None
No privileges needed
User Interaction
None
No user interaction needed
Impact Assessment
Confidentiality
None
No data leak
Integrity
None
No data modification
Availability
Low
Partial disruption
CVSS Vector v4.0
Weakness Type (CWE)
Vulnerable Products 1
| Configuration | From (including) | Up to (excluding) |
|---|---|---|
|
Pac4j Pac4j
cpe:2.3:a:pac4j:pac4j:*:*:*:*:*:*:*:*
|
— |
6.5.6
|
References 5
https://github.com/pac4j/pac4j/commit/2270c3ff70e93cc43831e75702acd5135531237e
Patch Commit
https://www.pac4j.org/blog/security-advisory-pac4j-core-oidc-saml.html
pac4j Security Advisory for pac4j-core, pac4j-oidc and pac4j-saml
https://github.com/pac4j/pac4j/blob/pac4j-parent-6.5.5/pac4j-saml/src/main/java…
NVD
https://github.com/pac4j/pac4j
NVD
https://www.vulncheck.com/advisories/pac4j-saml-before-6.5.6-session-destructio…
VulnCheck Advisory: pac4j-saml before 6.5.6 Session Destruction via Unsigned LogoutRequest