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If you use Slack, a popular cloud-based team collaboration server, and recently received an email from the company about a security incident, don't panic and read this article before taking any action. Slack has been sending a "password reset" notification email to all those users who had not yet changed passwords for their Slack accounts since 2015 when the company suffered a massive data breach. For those unaware, in 2015, hackers unauthorisedly gained access to one of the company's databases that stored user profile information, including their usernames, email addresses, and hashed passwords. At that time, attackers also secretly inserted code, probably on the login page, which allowed them to capture plaintext passwords entered by some Slack users during that time. However, immediately following the security incident, the company automatically reset passwords for those small number of Slack users whose plaintext passwords were exposed, but asked other aff...

Eastern European country Bulgaria has suffered the biggest data breach in its history that compromised personal and financial information of 5 million adult citizens out of its total population of 7 million people. According to multiple sources in local Bulgarian media , an unknown hacker earlier this week emailed them download links to 11GB of stolen data which included taxpayer's personal identifiable numbers, addresses, and financial data. In a brief statement released Monday, the National Revenue Agency (NRA) of Bulgaria said the stolen data originates from the country's tax reporting service. The NRA also indicated that the Ministry of the Interior and the State Agency for National Security (SANS) have started taking an assessment of the potential vulnerability in NRA's systems that attackers might have exploited to breach into its databases. It appears that until now, the hacker, who claimed to be a Russian man, has only released 57 out of a total of 110 c...

Security researchers have discovered a rare piece of Linux spyware that's currently fully undetected across all major antivirus security software products, and includes rarely seen functionalities with regards to most Linux malware, The Hacker News learned. It's a known fact that there are a very few strains of Linux malware exist in the wild as compared to Windows viruses because of its core architecture and also due to its low market share, and also many of them don't even have a wide range of functionalities. In recent years, even after the disclosure of severe critical vulnerabilities in various flavors of Linux operating systems and software, cybercriminals failed to leverage most of them in their attacks. Instead, a large number of malware targeting Linux ecosystem is primarily focused on cryptocurrency mining attacks for financial gain and creating DDoS botnets by hijacking vulnerable servers. However, researchers at security firm Intezer Labs recently d...

Earlier this month, The Hacker News covered a story on research revealing how over 1300 Android apps are collecting sensitive data even when users have explicitly denied the required permissions. The research was primarily focused on how app developers abuse multiple ways around to collect location data, phone identifiers, and MAC addresses of their users by exploiting both covert and side channels. Now, a separate team of cybersecurity researchers has successfully demonstrated a new side-channel attack that could allow malicious apps to eavesdrop on the voice coming out of your smartphone's loudspeakers without requiring any device permission. Abusing Android Accelerometer to Capture Loudspeaker Data Dubbed Spearphone , the newly demonstrated attack takes advantage of a hardware-based motion sensor, called an accelerometer, which comes built into most Android devices and can be unrestrictedly accessed by any app installed on a device even with zero permissions. An ...

In every organization, there is a person who's directly accountable for cybersecurity. The name of the role varies per the organization's size and maturity – CISO, CIO, and Director of IT are just a few common examples – but the responsibility is similar in all places. They're the person who understands the risk and exposure, knows how prepared the team and most important – what the gaps are and how they can be best addressed. Apart from actually securing the organization – and losing some sleep over it – this individual has another equally important task: to communicate the security risk, needs, and status to the company's management. After all, the level of security rises in direct proportion to the amount of invested resources, and management people are the ones who decide and allocate them. Since management people are not typically cybersecurity savvy, engaging them can be challenging – one must find the balance between high-level explanations, a direct c...

If you think that the media files you receive on your end-to-end encrypted secure messaging apps can not be tampered with, you need to think again. Security researchers at Symantec yesterday demonstrated multiple interesting attack scenarios against WhatsApp and Telegram Android apps, which could allow malicious actors to spread fake news or scam users into sending payments to wrong accounts. Dubbed " Media File Jacking ," the attack leverages an already known fact that any app installed on a device can access and rewrite files saved in the external storage, including files saved by other apps installed on the same device. WhatsApp and Telegram allow users to choose if they want to save all incoming multimedia files on internal or external storage of their device. However, WhatsApp for Android by default automatically stores media files in the external storage, while Telegram for Android uses internal storage to store users files that are not accessible to any othe...

The same security vulnerabilities that were recently reported in Zoom for macOS also affect two other popular video conferencing software that under the hood, are just a rebranded version of Zoom video conferencing software. Security researchers confirmed The Hacker News that RingCentral, used by over 350,000 businesses, and Zhumu, a Chinese version of Zoom, also runs a hidden local web server on users' computers, just like Zoom for macOS. The controversial local web server that has been designed to offer an automatic click-to-join feature was found vulnerable to remote command injection attacks through 3rd-party websites. Security researcher Jonathan Leitschuh initially provided a proof-of-concept demonstrating how the vulnerable web server  could eventually allow attackers to turn on users laptop's webcam and microphone remotely. The flaw was later escalated to remote code execution attack by another security researcher, Karan Lyons , who has now published a new v...