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Signal Messenger Bug Lets Callers Auto-Connect Calls Without Receivers' Interaction

Signal Messenger Bug Lets Callers Auto-Connect Calls Without Receivers' Interaction

October 04, 2019Swati Khandelwal
Almost every application contains security vulnerabilities, some of which you may find today, but others would remain invisible until someone else finds and exploits them—which is the harsh reality of cybersecurity and its current state. And when we say this, Signal Private Messenger —promoted as one of the most secure messengers in the world—isn't any exception. Google Project Zero researcher Natalie Silvanovich discovered a logical vulnerability in the Signal messaging app for Android that could allow malicious caller to force a call to be answered at the receiver's end without requiring his/her interaction. In other words, the flaw could be exploited to turn on the microphone of a targeted Signal user's device and listen to all surrounding conversations. However, the Signal vulnerability can only be exploited if the receiver fails to answer an audio call over Signal, eventually forcing the incoming call to be automatically answered on the receiver's device
Signal Secure Messaging App Now Encrypts Sender's Identity As Well

Signal Secure Messaging App Now Encrypts Sender's Identity As Well

October 30, 2018Swati Khandelwal
Signal, the popular end-to-end encrypted messaging app, is planning to roll out a new feature that aims to hide the sender's identity from potential attackers trying to intercept the communication. Although messages send via secure messaging services, like Signal , WhatsApp , and Telegram , are fully end-to-end encrypted as they transmit across their servers, each message leaves behind some of the metadata information that reveals who sent the message to whom and when. The new feature, dubbed " Sealed Sender ," announced by Signal is going to further reduce the amount of information that is accessible to the company itself. However, you should note that Signal never stores metadata or logs of information on its users like who sends messages to each other and when, but the new feature would protect the sender's identity in case the communication is somehow intercepted. How Does the Signal's Sealed Sender Feature Protect Metadata? According to a blog post
Another severe flaw in Signal desktop app lets hackers steal your chats in plaintext

Another severe flaw in Signal desktop app lets hackers steal your chats in plaintext

May 16, 2018Swati Khandelwal
For the second time in less than a week, users of the popular end-to-end encrypted Signal messaging app have to update their desktop applications once again to patch another severe code injection vulnerability. Discovered Monday by the same team of security researchers, the newly discovered vulnerability poses the same threat as the previous one, allowing remote attackers to inject malicious code on the recipients' Signal desktop app just by sending them a message—without requiring any user interaction. To understand more about the first code injection vulnerability ( CVE-2018-10994 ), you can read our previous article covering how researchers find the Signal flaw and how it works. The only difference between the two is that the previous flaw resides in the function that handles links shared in the chat, whereas the new vulnerability (CVE-2018-11101) exists in a different function that handles the validation of quoted messages, i.e., quoting a previous message in a reply
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