The Mystery of ‘Jia Tan,’ the XZ Backdoor Mastermind
The thwarted XZ Utils supply chain attack was years in the making. Now, clues suggest nation-state hackers were behind the persona that inserted the malicious code.
CVE-2024-3094 is the new hot one and it’s extremely critical; however, impact should be limited as most normal linux distros are unaffected. Here’s some stuff to know:
This page is short for now but it will get updated as I learn more about the incident. Most likely it will be during the first week of April 2024. The Git repositories of XZ projects are on git.tukaani.org. xz.tukaani.org DNS name (CNAME) has been removed. The XZ projects currently don’t have a home page. This will be fixed in a few days.
Urgent security alert for Fedora 41 and Fedora Rawhide users
Red Hat Information Risk and Security and Red Hat Product Security learned that the latest versions of the “xz” tools and libraries contain malicious code that appears to be intended to allow unauthorized access.
Decade-old Linux ‘wall’ bug helps make fake SUDO prompts, steal passwords
A vulnerability has been discovered in the 'util-linux' library that could allow unprivileged users to put arbitrary text on other users' terminals using the 'wall' command.
Flipping Pages: An analysis of a new Linux vulnerability in nf_tables and hardened exploitation techniques
A tale about exploiting KernelCTF Mitigation, Debian, and Ubuntu instances with a double-free in nf_tables in the Linux kernel, using novel techniques like Dirty Pagedirectory. All without even having to recompile the exploit for different kernel targets once.
Windows 11, Tesla, and Ubuntu Linux hacked at Pwn2Own Vancouver
On the first day of Pwn2Own Vancouver 2024, contestants demoed Windows 11, Tesla, and Ubuntu Linux zero-day vulnerabilities and exploit chains to win $732,500 and a Tesla Model 3 car.
Magnet Goblin Targets Publicly Facing Servers Using 1-Day Vulnerabilities
Magnet Goblin is a financially motivated threat actor that quickly adopts and leverages 1-day vulnerabilities in public-facing services as an initial infection vector. At least in one case of Ivanti Connect Secure VPN (CVE-2024-21887), the exploit entered the group’s arsenal as fast as within 1 day after a POC for it was published. Campaigns that we were able to attribute to this actor targeted Ivanti, Magento, Qlink Sense and possibly Apache ActiveMQ. Analysis of the actor’s recent Ivanti Connect Secure VPN campaign revealed a novel Linux version of a malware called NerbianRAT, in addition to WARPWIRE, a JavaScript credential stealer. * The actor’s arsenal also includes MiniNerbian, a small Linux backdoor, and remote monitoring and management (RMM) tools for Windows like ScreenConnect and AnyDesk.
Nobody would even suspect the mining malware was merely a mask, masquerading behind an intricate modular framework that supports both Linux and Windows. The amount of effort that went into creating the framework is truly remarkable, and its disclosure was quite astonishing.
[CVE-2023-42752] integer overflow in Linux kernel leading to exploitable memory access
I recently found an integer overflow in the Linux kernel, which leads to the kernel allocating skb_shared_info in the userspace, which is exploitable in systems without SMAP protection since skb_shared_info contains references to function pointers.
Reptile is an open-source kernel module rootkit that targets Linux systems and is publicly available on GitHub. [1] Rootkits are malware that possess the capability to conceal themselves or other malware. They primarily target files, processes, and network communications for their concealment. Reptile’s concealment capabilities include not only its own kernel module but also files, directories, file contents, processes, and network traffic. Unlike other rootkit malware that typically only provide concealment capabilities, Reptile goes a step further by offering a reverse...
Almost 40% of Ubuntu users vulnerable to new privilege elevation flaws
Two Linux vulnerabilities introduced recently into the Ubuntu kernel create the potential for unprivileged local users to gain elevated privileges on a massive number of devices.
AVrecon malware infects 70,000 Linux routers to build botnet
Since at least May 2021, stealthy Linux malware called AVrecon was used to infect over 70,000 Linux-based small office/home office (SOHO) routers and add them to a botnet designed to steal bandwidth and provide a hidden residential proxy service.
GobRAT malware written in Go language targeting Linux routers
JPCERT/CC has confirmed attacks that infected routers in Japan with malware around February 2023. This blog article explains the details of the attack confirmed by JPCERT/CC and GobRAT malware, which was used in the attack. ### Attack flow up to...
oss-sec: [CVE-2023-32233] Linux kernel use-after-free in Netfilter nf_tables when processing batch requests can be abused to perform arbitrary reads and writes in kernel memory
An issue has been discovered in the Linux kernel that can be abused by unprivileged local users to escalate privileges. The issue is about Netfilter nf_tables accepting some invalid updates to its configuration.
RTM Locker Ransomware as a Service (RaaS) Now on Linux - Uptycs
Uptycs threat research team discovered a new ransomware Linux binary attributed to the RTM group Locker, a known Ransomware-as-a-Service (RaaS) provider.
Here's an article from a French anarchist describing how his (encrypted) laptop was seized after he was arrested, and material from the encrypted partition has since been entered as evidence against him. His encryption password was supposedly greater than 20 characters and included a mixture of cases, numbers, and punctuation, so in the absence of any sort of opsec failures this implies that even relatively complex passwords can now be brute forced, and we should be transitioning to even more secure passphrases. Or does it? Let's go into what LUKS is doing in the first place. The actual data is typically encrypted with AES, an extremely popular and well-tested encryption algorithm. AES has no known major weaknesses and is not considered to be practically brute-forceable - at least, assuming you have a random key. Unfortunately it's not really practical to ask a user to type in 128 bits of binary every time they want to unlock their drive, so another approach has to be taken.
The ASEC analysis team recently discovered that a Linux malware developed with Shc has been installing a CoinMiner. It is presumed that after successful authentication through a dictionary attack on inadequately managed Linux SSH servers, various malware were installed on the target system. Among those installed were the Shc downloader, XMRig CoinMiner installed through the former, and DDoS IRC Bot, developed with Perl.
The ASEC analysis team recently discovered that a Linux malware developed with Shc has been installing a CoinMiner. It is presumed that after successful authentication through a dictionary attack on inadequately managed Linux SSH servers, various malware were installed on the target system. Among those installed were the Shc downloader, XMRig CoinMiner installed through the former, and DDoS IRC Bot, developed with Perl.
The ASEC analysis team recently discovered that a Linux malware developed with Shc has been installing a CoinMiner. It is presumed that after successful authentication through a dictionary attack on inadequately managed Linux SSH servers, various malware were installed on the target system. Among those installed were the Shc downloader, XMRig CoinMiner installed through the former, and DDoS IRC Bot, developed with Perl.
The ASEC analysis team recently discovered that a Linux malware developed with Shc has been installing a CoinMiner. It is presumed that after successful authentication through a dictionary attack on inadequately managed Linux SSH servers, various malware were installed on the target system. Among those installed were the Shc downloader, XMRig CoinMiner installed through the former, and DDoS IRC Bot, developed with Perl.
The ASEC analysis team recently discovered that a Linux malware developed with Shc has been installing a CoinMiner. It is presumed that after successful authentication through a dictionary attack on inadequately managed Linux SSH servers, various malware were installed on the target system. Among those installed were the Shc downloader, XMRig CoinMiner installed through the former, and DDoS IRC Bot, developed with Perl.
The ASEC analysis team recently discovered that a Linux malware developed with Shc has been installing a CoinMiner. It is presumed that after successful authentication through a dictionary attack on inadequately managed Linux SSH servers, various malware were installed on the target system. Among those installed were the Shc downloader, XMRig CoinMiner installed through the former, and DDoS IRC Bot, developed with Perl.
The ASEC analysis team recently discovered that a Linux malware developed with Shc has been installing a CoinMiner. It is presumed that after successful authentication through a dictionary attack on inadequately managed Linux SSH servers, various malware were installed on the target system. Among those installed were the Shc downloader, XMRig CoinMiner installed through the former, and DDoS IRC Bot, developed with Perl.