Security advisory to websites using OpenID Attribute Exchange

A security advisory was issued to websites using OpenID Attribute Exchange (AX) due to a vulnerability that could allow an authentication bypass, particularly affecting sites using the OpenID4Java library. The flaw involves websites failing to confirm that certain information received through AX was properly signed, posing a risk if sensitive information like email addresses is involved. Google and other OpenID Foundation members have worked to inform and assist affected websites in deploying fixes, and no known exploitations of the vulnerability have been reported so far. The advisory emphasizes the need for OpenID relying parties to ensure AX attributes are signed and suggests upgrading to patched versions of affected libraries, while highlighting the importance of verifying email addresses retrieved via OpenID. The advisory acknowledges the contributions of security researchers Rui Wang, Shuo Chen, and XiaoFeng Wang and provides guidance for application developers to safeguard against this issue.

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