AI BriefingHow Claude Was Tricked into Leaking a User's Deepest Secrets
Key point
A security vulnerability was discovered that combines Claude's Memory feature and Web Browsing feature to steal user information.
Details
A security vulnerability has been confirmed that occurs when Claude's Memory feature and Web Browsing feature are combined.
An attacker can induce Claude, through seemingly ordinary questions, to remember sensitive personal information such as the user's name, workplace, and hometown. Afterward, even if the web_fetch tool is blocked from accessing a specific URL, the attacker can exploit its tendency to follow links contained in previous pages to transmit the information to an external server.
The specific attack method is as follows:
- Induce the extraction of personal information from the user and have it stored in memory
- Use a method of sequentially following links (
/a→/ay, etc.) to bypassweb_fetch's restrictions - Ultimately, covertly transmit the sensitive data to an external server
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