GameOver(lay) encompasses two significant vulnerabilities within the Ubuntu kernel, CVE-2023-2640, and CVE-2023-32629, each carrying a high-severity rating with CVSS scores of 7.8. These vulnerabilities pose a critical threat, potentially affecting around 40% of Ubuntu users. The vulnerability lies within the OverlayFS module of the Ubuntu kernel, enabling a
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...
Netfilter is a framework in the Linux kernel for implementing various networking-related tasks with user-defined handlers. Netfilter provides various functions for packet filtering, network address translation and port translation, and packet logging. Netfilter represents a set of hooks that allow other kernel modules to register callback functions in the kernel’s networking stack.
At Grapl we believe that in order to build the best defensive system we need to deeply understand attacker behaviors. As part of that goal we're investing in offensive security research. Keep up with our blog for new research on high risk vulnerabilities, exploitation, and advanced threat tactics.
A few weeks ago, I found and reported CVE-2022-25636 - a heap out of bounds write in the Linux kernel. The bug is exploitable to achieve kernel code execution (via ROP), giving full local privilege escalation, container escape, whatever you want.
This is the story of CVE-2022-0847, a vulnerability in the Linux kernel since 5.8 which allows overwriting data in arbitrary read-only files. This leads to privilege escalation because unprivileged processes can inject code into root processes.
It is similar to CVE-2016-5195 “Dirty Cow” but is easier to exploit.
The vulnerability was fixed in Linux 5.16.11, 5.15.25 and 5.10.102.