CVE-2019-9970: Medium severity signal private messenger vulnerability
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.
Affected Software
Event History
Frequently Asked Questions
What is CVE-2019-9970?
CVE-2019-9970 is a vulnerability in Open Whisper Signal (aka Signal-Desktop) through 1.23.1 and the Signal Private Messenger application through 4.35.3 for Android that exposes users to an IDN homograph attack when displaying messages containing URLs.
How does CVE-2019-9970 affect Signal Private Messenger for Android?
CVE-2019-9970 affects Signal Private Messenger for Android versions up to and including 4.35.3.
How does CVE-2019-9970 affect Signal-Desktop?
CVE-2019-9970 affects Signal-Desktop versions up to and including 1.23.1.
What is an IDN homograph attack?
An IDN homograph attack is a type of phishing attack where an attacker uses visually similar characters to create a fake website that appears identical to the legitimate one.
Are there any known fixes for CVE-2019-9970?
At the moment, there are no known fixes for CVE-2019-9970. It is recommended to exercise caution when clicking on URLs in Signal messages.