7.1 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality Impact
LOW
Integrity Impact
LOW
Availability Impact
LOW
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L
0.0005 Low
EPSS
Percentile
17.0%
The package does not validate the ACS Location URI according to the SAML binding being parsed.
If abused, this flaw allows attackers to register malicious Service Providers at the IdP and inject Javascript in the ACS endpoint definition, achieving Cross-Site-Scripting (XSS) in the IdP context during the redirection at the end of a SAML SSO Flow.
Consequently, an attacker may perform any authenticated action as the victim once the victimβs browser loaded the SAML IdP initiated SSO link for the malicious service provider.
Note: The severity is considered βHighβ because the SP registration is commonly an unrestricted operation in IdPs, hence not requiring particular permissions or publicly accessible to ease the IdP interoperability.
This issue is fixed in 0.4.14
Users of the package can perform external validation of URLs provided in SAML metadata, or restrict the ability for end-users to upload arbitrary metadata.
This issue was reported by Francesco Lacerenza from Doyensec.
CPE | Name | Operator | Version |
---|---|---|---|
github.com/crewjam/saml | lt | 0.4.14 |