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Close to 14 million Linux-based systems are directly exposed to the Internet, making them a lucrative target for an array of real-world attacks that could result in the deployment of malicious web shells, coin miners, ransomware, and other trojans. That's according to an in-depth look at the Linux threat landscape published by U.S.-Japanese cybersecurity firm Trend Micro , detailing the top threats and vulnerabilities affecting the operating system in the first half of 2021, based on data amassed from honeypots, sensors, and anonymized telemetry. The company, which detected nearly 15 million malware events aimed at Linux-based cloud environments, found coin miners and ransomware to make up 54% of all malware, with web shells accounting for a 29% share. In addition, by dissecting over 50 million events reported from 100,000 unique Linux hosts during the same time period, the researchers found 15 different security weaknesses that are known to be actively exploited in the wild o...

A cybersecurity researcher today uncovers a set of 7 new unpatchable hardware vulnerabilities that affect all desktops and laptops sold in the past 9 years with Thunderbolt, or Thunderbolt-compatible USB-C ports. Collectively dubbed 'ThunderSpy,' the vulnerabilities can be exploited in 9 realistic evil-maid attack scenarios, primarily to steal data or read/write all of the system memory of a locked or sleeping computer—even when drives are protected with full disk encryption. In a nutshell, if you think someone with a few minutes of physical access to your computer—regardless of the location—can cause any form of significant harm to you, you're at risk for an evil maid attack. According to Björn Ruytenberg of the Eindhoven University of Technology, the ThunderSpy attack "may require opening a target laptop's case with a screwdriver, [but] it leaves no trace of intrusion and can be pulled off in just a few minutes." In other words, the flaw is not li...

The US-CERT today issued advisory warning users of a new dangerous 17-year-old remote code execution vulnerability affecting the PPP daemon (pppd) software that comes installed on almost all Linux based operating systems, as well as powers the firmware of many other networking devices. The affected pppd software is an implementation of Point-to-Point Protocol (PPP) that enables communication and data transfer between nodes, primarily used to establish internet links such as those over dial-up modems, DSL broadband connections, and Virtual Private Networks. Discovered by IOActive security researcher Ilja Van Sprundel , the critical issue is a stack buffer overflow vulnerability that exists due to a logical error in the Extensible Authentication Protocol (EAP) packet parser of the pppd software, an extension that provides support for additional authentication methods in PPP connections. The vulnerability , tracked as CVE-2020-8597  with CVSS Score 9.8, can be exploited by ...

A team of cybersecurity researchers has disclosed a new severe vulnerability affecting most Linux and Unix-like operating systems, including FreeBSD, OpenBSD, macOS, iOS, and Android, that could allow remote 'network adjacent attackers' to spy on and tamper with encrypted VPN connections. The vulnerability, tracked as CVE-2019-14899, resides in the networking stack of various operating systems and can be exploited against both IPv4 and IPv6 TCP streams. Since the vulnerability does not rely on the VPN technology used, the attack works against widely implemented virtual private network protocols like OpenVPN, WireGuard, IKEv2/IPSec, and more, the researchers confirmed. This vulnerability can be exploited by a network attacker — controlling an access point or connected to the victim's network — just by sending unsolicited network packets to a targeted device and observing replies, even if they are encrypted. As explained by the researchers, though there are variati...

Linux users, beware! If you haven't recently updated your Linux operating system, especially the command-line text editor utility, do not even try to view the content of a file using Vim or Neovim. Security researcher Armin Razmjou recently discovered a high-severity arbitrary OS command execution vulnerability (CVE-2019-12735) in Vim and Neovim —two most popular and powerful command-line text editing applications that come pre-installed with most Linux-based operating systems. On Linux systems, Vim editor allows users to create, view or edit any file, including text, programming scripts, and documents. Since Neovim is just an extended forked version of Vim, with better user experience, plugins and GUIs, the code execution vulnerability also resides in it. Code Execution Flaw in Vim and Neovim Razmjou discovered a flaw in the way Vim editor handles "modelines," a feature that's enabled-by-default to automatically find and apply a set of custom pref...

Libssh2, a popular open source client-side C library implementing the SSHv2 protocol, has released the latest version of its software to patch a total of nine security vulnerabilities. The Libssh2 library is available for all major distributors of the Linux operating systems, including Ubuntu, Red Hat, Debian, and also comes bundled within some distributions and software as a default library. According to an  advisory published Monday, all the below listed vulnerabilities that were patched with the release of libssh2 version 1.8.1 lead to memory corruption issues which could result in arbitrary code execution on a client system in certain circumstances. Here's the list of security vulnerabilities patched in Libssh: 1. CVE-2019-3855: Possible integer overflow in transport read that could lead to an out-of-bounds write. A malicious server, or a remote attacker who compromises an SSH server, could send a specially crafted packet which could result in executing malicious ...

Yet another incident which showcases that you should not explicitly trust user-controlled software repositories. One of the most popular Linux distros Arch Linux has pulled as many as three user-maintained software repository AUR packages after it was found hosting malicious code. Arch Linux is an independently developed, general-purpose GNU/Linux distribution composed predominantly of free and open-source software, and supports community involvement. Besides official repositories like Arch Build System (ABS), Arch Linux users can also download software packages from several other repositories, including AUR (Arch User Repository), a community-driven repository created and managed by Arch Linux users. Since AUR packages are user-produced content, Arch maintainers always suggest Linux users to carefully check all files, especially PKGBUILD and any .install file for malicious commands. However, this AUR repository has recently been found hosting malware code in several inst...

A bug in Linux kernel that was discovered two years ago, but was not considered a security threat at that time, has now been recognised as a potential local privilege escalation flaw. Identified as CVE-2017-1000253, the bug was initially discovered by Google researcher Michael Davidson in April 2015. Since it was not recognised as a serious bug at that time, the patch for this kernel flaw was not backported to long-term Linux distributions in kernel 3.10.77. However, researchers at Qualys Research Labs has now found that this vulnerability could be exploited to escalate privileges and it affects all major Linux distributions, including Red Hat, Debian, and CentOS. The vulnerability left "all versions of CentOS 7 before 1708 (released on September 13, 2017), all versions of Red Hat Enterprise Linux 7 before 7.4 (released on August 1, 2017), and all versions of CentOS 6 and Red Hat Enterprise Linux 6 are exploitable," Qualys said in an advisory published yesterday....

Microsoft has been expressing its love for Linux for almost three years now, and this love costs Microsoft an arm and a leg. Last year, Microsoft surprised everyone by announcing the arrival of Windows Subsystem for Linux (WSL) in Windows 10, which brings the Linux command-line shell to Windows , allowing users to run native Linux applications on Windows system without virtualization. However, security researchers from security firm Check Point Software Technologies have discovered a potential security issue with the WSL feature that could allow malware families designed for Linux target Windows computers—undetected by all current security software. The researchers devised a new attack technique, dubbed Bashware , that takes advantage of Windows' built-in WSL feature, which is now out of beta and is set to arrive in the Windows 10 Fall Creators Update in October 2017. Bashware Attack Undetectable by All Anti-Virus & Security Solutions According to CheckPoint rese...

If you came across any Facebook message with a video link sent by anyone, even your friend — just don't click on it. Security researchers at Kaspersky Lab have spotted an ongoing cross-platform campaign on Facebook Messenger, where users receive a video link that redirects them to a fake website, luring them to install malicious software. Although it is still unclear how the malware spreads, researchers believe spammers are using compromised accounts, hijacked browsers, or clickjacking techniques to spread the malicious link. The attackers make use of social engineering to trick users into clicking the video link, which purports to be from one of their Facebook friends, with the message that reads "< your friend name > Video" followed by a bit.ly link, as shown. Here's How this Cross-Platform Malware Works: The URL redirects victims to a Google doc that displays a dynamically generated video thumbnail, like a playable movie, based on the sender'...

A critical vulnerability has been discovered in Systemd , the popular init system and service manager for Linux operating systems, that could allow remote attackers to potentially trigger a buffer overflow to execute malicious code on the targeted machines via a DNS response. The vulnerability, designated as CVE-2017-9445 , actually resides in the ' dns_packet_new ' function of 'systemd-resolved,' a DNS response handler component that provides network name resolution to local applications. According to an advisory published Tuesday, a specially crafted malicious DNS response can crash 'systemd-resolved' program remotely when the system tries to lookup for a hostname on an attacker-controlled DNS service. Eventually, large DNS response overflows the buffer, allowing an attacker to overwrite the memory which leads to remote code execution. This means the attackers can remotely run any malware on the targeted system or server via their evil DNS service...

A Russian man accused of infecting tens of thousands of computer servers worldwide to generate millions in illicit profit has finally entered a guilty plea in the United States and is going to face sentencing in August. Maxim Senakh, 41, of Velikii Novgorod, Russia, pleaded guilty in a US federal court on Tuesday for his role in the development and maintenance of the infamous Linux botnet known as Ebury that siphoned millions of dollars from victims worldwide. Senakh, who was detained by Finland in August 2015 and extradition to the US in January 2016, admitted to installing Ebury malware on computer servers worldwide, including thousands in the United States. First spotted in 2011, Ebury is an SSH backdoor Trojan for Linux and Unix-style operating systems, like FreeBSD or Solaris, which infected more than 500,000 computers and 25,000 dedicated servers in a worldwide malware campaign called ' Operation Windigo .' Ebury backdoor gives attackers full shell control of...

A nine-year-old critical vulnerability has been discovered in virtually all versions of the Linux operating system and is actively being exploited in the wild. Dubbed " Dirty COW ," the Linux kernel security flaw (CVE-2016-5195) is a mere privilege-escalation vulnerability, but researchers are taking it extremely seriously due to many reasons. First, it's very easy to develop exploits that work reliably. Secondly, the Dirty COW flaw exists in a section of the Linux kernel, which is a part of virtually every distro of the open-source operating system, including RedHat, Debian, and Ubuntu, released for almost a decade. And most importantly, the researchers have discovered attack code that indicates the Dirty COW vulnerability is being actively exploited in the wild. Dirty COW potentially allows any installed malicious app to gain administrative (root-level) access to a device and completely hijack it within just 5 seconds. Earlier this week, Linus Torvalds admi...

Are you also the one who downloaded Linux Mint on February 20th? You may have been Infected! Linux Mint is one of the best and popular Linux distros available today, but if you have downloaded and installed the operating system recently you might have done so using a malicious ISO image. Here's why: Last night, Some unknown hacker or group of hackers had managed to hack into the Linux Mint website and replaced the download links on the site that pointed to one of their servers offering a malicious ISO images for the Linux Mint 17.3 Cinnamon Edition . "Hackers made a modified Linux Mint ISO, with a backdoor in it, and managed to hack our website to point to it," the head of Linux Mint project Clement Lefebvre said in a surprising announcement dated February 21, 2016. Who are affected? As far as the Linux Mint team knows, the issue only affects the one edition, and that is Linux Mint 17.3 Cinnamon edition. The situation happened last night, s...

Hackers enjoy much playing with PlayStation and Xbox, rather than playing on them. And this time, they have done some crazy things with Sony's PlayStation gaming console. It appears that a console-hacking that goes by the name of Fail0verflow have managed to hack PlayStation 4 (PS4) to run a Linux kernel-based operating system. Fail0verflow announced this week that they successfully cracked the PlayStation 4 and managed to install a full version of Linux on the system, turning the PlayStation 4 into a real PC . With this latest PS4 hack, the console-hacking group gave the homebrew software community hope that Sony's popular game console will soon become a valuable tool in their arsenal. Group Managed to Run Game Boy Advance and Pokémon on PS4 What's even more interesting? The hacking group didn't stop with Linux. The group also managed to install an emulator for the Game Boy Advance and a version of Pokémon , dubbing it the "PlayStat...

So what would anyone need to bypass password protection on your computer? It just needs to hit the backspace key 28 times , for at least the computer running Linux operating system. Wait, what? A pair of security researchers from the University of Valencia have uncovered a bizarre bug in several distributions of Linux that could allow anyone to bypass any kind of authentication during boot-up just by pressing backspace key 28 times. This time, the issue is neither in a kernel nor in an operating system itself, but rather the vulnerability actually resides in Grub2 , the popular Grand Unified Bootloader , which is used by most Linux systems to boot the operating system when the PC starts. Also Read: GPU-based Linux Rootkit and Keylogger . The source of the vulnerability is nothing but an integer underflow fault that was introduced with single commit in Grub version 1.98 (December 2009) – b391bdb2f2c5ccf29da66cecdbfb7566656a704d – affecting the grub_password...

Offensive Security , the creators of Swiss army knife for Security researchers, Penetration testers and Hackers have finally released the much awaited and most powerful version of  Kali Linux 2.0 . Kali Linux 2.0 (Codename 'Kali Sana') , an open-source penetration testing platform brings hundreds of Penetration Testing, Forensics, Hacking and Reverse Engineering tools together into a Debian-based Linux distribution. Kali Linux 2.0 offers a redesigned user interface for streamlined work experience, along with a new multi-level menus and tool categories options. Kali Linux 2.0 is now a rolling distribution, means users will receive tools and core system updates frequently. Kali Linux 2.0 Features: Runs on Linux kernel 4.0,  use full Gnome 3 Desktop instead of gnome-fallback,  improved hardware and wireless driver coverage,  support for a variety of Desktop Environments,  updated desktop environment and tools,  Featuring new cutt...

The world of hacking has become more organized and reliable over recent years and so the techniques of hackers. Nowadays, attackers use highly sophisticated tactics and often go to extraordinary lengths in order to mount an attack. And there is something new to the list: A team of developers has created not one, but two pieces of malware that run on an infected computer's graphics processor unit (GPU) instead of its central processor unit (CPU), in order to enhance their stealthiness and computational efficiency. The two pieces of malware: Jellyfish Rootkit for Linux operating system Demon Keylogger The source code of both the Jellyfish Rootkit and the Demon keylogger, which are described as proof-of-concepts malware, have been published on Github. Until now, security researchers have discovered nasty malware running on the CPU and exploiting the GPU capabilities in an attempt to mine cryptocurrencies such as Bitcoins. However, these two malware co...