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A vulnerability exists where if a user opens a locally saved HTML file, this file can use file: URIs to access other files in the same directory or sub-directories if the names are known or guessed. The Fetch API can then be used to read the contents of any files stored in these directories and they may uploaded to a server. It was demonstrated that in combination with a popular Android messaging app, if a malicious HTML attachment is sent to a user and they opened that attachment in Firefox, due to that app's predictable pattern for locally-saved file names, it is possible to read attachments the victim received from other correspondents. This vulnerability affects Firefox ESR < 60.8, Firefox < 68, and Thunderbird < 60.8.

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Mozilla Firefox 信息泄露漏洞

Mozilla Firefox是美国Mozilla基金会的一款开源Web浏览器。 Mozilla Firefox 68之前版本和Firefox ESR 60.8之前版本中存在信息泄露漏洞。攻击者可利用该漏洞绕过安全限制，读取用户接收到的附件内容。

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