IDN Homograph Attack Vulnerability in Signal Messaging App

CVE-2019-9970 · MEDIUM Severity

AV:N/AC:M/AU:N/C:N/I:P/A:N

Open Whisper Signal (aka Signal-Desktop) through 1.23.1 and the Signal Private Messenger application through 4.35.3 for Android are vulnerable to an IDN homograph attack when displaying messages containing URLs. This occurs because the application produces a clickable link even if (for example) Latin and Cyrillic characters exist in the same domain name, and the available font has an identical representation of characters from different alphabets.

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