Bug 1216308 (CVE-2023-45683)

Summary: VUL-0: CVE-2023-45683: TRACKERBUG: github.com/crewjam/saml: XSS via missing Binding syntax validation
Product: [Novell Products] SUSE Security Incidents Reporter: SMASH SMASH <smash_bz>
Component: IncidentsAssignee: Security Team bot <security-team>
Status: NEW --- QA Contact: Security Team bot <security-team>
Severity: Major    
Priority: P3 - Medium CC: gabriele.sonnu
Version: unspecified   
Target Milestone: ---   
Hardware: Other   
OS: Other   
URL: https://smash.suse.de/issue/382019/
Whiteboard: CVSSv3.1:SUSE:CVE-2023-45683:7.1:(AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L)
Found By: Security Response Team Services Priority:
Business Priority: Blocker: ---
Marketing QA Status: --- IT Deployment: ---
Bug Depends on: 1216310, 1216309, 1216311    
Bug Blocks:    

Description SMASH SMASH 2023-10-17 07:59:41 UTC 
Impact

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 victim’s browser loaded the SAML IdP initiated SSO link for the malicious service provider.

Note: The severity is considered “High” because the SP registration is commonly an unrestricted operation in IdPs, hence not requiring particular permissions or publicly accessible to ease the IdP interoperability.

Patches

This issue is fixed in 0.4.14

Workarounds

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.

References:
https://github.com/crewjam/saml/security/advisories/GHSA-267v-3v32-g6q5
http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2023-45683