[github.com/crewjam/saml] crewjam/saml vulnerable to signature bypass via multiple Assertion elements due to improper authentication

Impact

The crewjam/saml go library is vulnerable to an authentication bypass when processing SAML responses containing multiple Assertion elements.

Patches

This issue has been corrected in version 0.4.9.

Credit

This issue was reported by Felix Wilhelm from Google Project Zero.

References

• https://github.com/crewjam/saml/security/advisories/GHSA-j2jp-wvqg-wc2g
• https://nvd.nist.gov/vuln/detail/CVE-2022-41912
• https://github.com/crewjam/saml/commit/aee3fb1edeeaf1088fcb458727e0fd863d277f8b
• https://github.com/crewjam/saml/releases/tag/v0.4.9
• https://github.com/advisories/GHSA-j2jp-wvqg-wc2g