For the January Elevation of Privilege (Local Privilege Escalation) – Linux Kernel (CVE-2024-1086), the write-up and PoC were released on March 26. The video demo for the script looks impressive: they run the script as a regular user and after a couple of seconds they get a root shell. According to the author, the exploit works with most Linux kernels between versions 5.14 and 6.6, including Debian, Ubuntu and KernelCTF.
The exploit requires kconfig CONFIG_USER_NS=y; sh command sysctl kernel.unprivileged_userns_clone = 1; kconfig CONFIG_NF_TABLES=y. The author writes that this is the default for Debian, Ubuntu, and KernelCTF, and for other distributions it is necessary to test it. The exploit does not work with kernels v6.4> with kconfig CONFIG_INIT_ON_ALLOC_DEFAULT_ON=y (including Ubuntu v6.5)
February 2024: Vulremi, Vuldetta, PT VM Course relaunch, PT TrendVulns digests, Ivanti, Fortinet, MSPT, Linux PW. Hello everyone! In this episode, I will talk about the February updates of my open source projects, also about projects at my main job at Positive Technologies and interesting vulnerabilities.
November 2023 – January 2024: New Vulristics Features, 3 Months of Microsoft Patch Tuesdays and Linux Patch Wednesdays, Year 2023 in Review. Hello everyone! It has been 3 months since the last episode. I spent most of this time improving my Vulristics project. So in this episode, let’s take a look at what’s been done.
Also, let’s take a look at the Microsoft Patch Tuesdays vulnerabilities, Linux Patch Wednesdays vulnerabilities and some other interesting vulnerabilities that have been released or updated in the last 3 months. Finally, I’d like to end this episode with a reflection on how my 2023 went and what I’d like to do in 2024.
October 2023: back to Positive Technologies, Vulristics updates, Linux Patch Wednesday, Microsoft Patch Tuesday, PhysTech VM lecture. Hello everyone! October was an interesting and busy month for me. I started a new job, worked on my open source Vulristics project, and analyzed vulnerabilities using it. Especially Linux vulnerabilities as part of my new Linux Patch Wednesday project. And, of course, analyzed Microsoft Patch Tuesday as well. In addition, at the end of October I was a guest lecturer at MIPT/PhysTech university. But first thing first.
September 2023: VM courses, Bahasa Indonesia, Russian Podcasts, Goodbye Tinkoff, MS Patch Tuesday, Qualys TOP 20, Linux, Forrester, GigaOm, R-Vision VM. Hello everyone! On the last day of September, I decided to record another retrospective episode on how my Vulnerability Management month went.
Scanvus now supports Vulners and Vulns.io VM Linux vulnerability detection APIs. Hello everyone! Great news for my open source Scanvus project! You can now perform vulnerability checks on Linux hosts and docker images not only using the Vulners.com API, but also with the Vulns.io VM API. It’s especially nice that all the code to support the new API was written and contributed by colleagues from Vulns.io. I just had to do the final test. Many thanks to them for this!
How can the support of these two APIs in Scanvus be useful?
Now there is no binding to one vendor. Choose which service and price you prefer.
The set of supported operating systems varies between Vulners.com and Vulns.io. If a particular Linux distribution is not supported by one vendor, it may be supported by another vendor.
Vulners and Vulns.io implemented vulnerability checks independently of each other. If the results differ when scanning the same host/image, then implementation errors will be clearly visible.
Scanvus is released under the MIT license, so you can use it as an example of working with the Vulners.com and Vulns.io APIs and use this code in your projects.
Scanvus – my open source Vulnerability Scanner for Linux hosts and Docker images. Hello everyone! This video was recorded for the VMconf 22 Vulnerability Management conference, vmconf.pw. I will be talking about my open source project Scanvus. This project is already a year old and I use it almost every day.
Scanvus (Simple Credentialed Authenticated Network VUlnerability Scanner) is a vulnerability scanner for Linux. Currently for Ubuntu, Debian, CentOS, RedHat, Oracle Linux and Alpine distributions. But in general for any Linux distribution supported by the Vulners Linux API. The purpose of this utility is to get a list of packages and Linux distribution version from some source, make a request to an external vulnerabililty detection API (only Vulners Linux API is currently supported), and show the vulnerability report.
Scanvus can show vulnerabilities for
localhost
remote host via SSH
docker image
inventory file of a certain format
This utility greatly simplifies Linux infrastructure auditing. And besides, this is a project in which I can try to implement my ideas on vulnerability detection.
Example of output
For all targets the output is the same. It contains information about the target and the type of check. Then information about the OS version and the number of Linux packages. And finally, the actual information about vulnerabilities: how many vulnerabilities were found and the criticality levels of these vulnerabilities. The table shows the criticality level, bulletin ID, CVE list for the bulletin, and a comparison of the invulnerable fixed package version with the actual installed version.
This report is not the only way to present results. You can optionally export the results to JSON (OS inventory data, raw vulnerability data from Vulners Linux API or processed vulnerability data).
This is my personal blog. The opinions expressed here are my own and not of my employer. All product names, logos, and brands are property of their respective owners. All company, product and service names used here for identification purposes only. Use of these names, logos, and brands does not imply endorsement. You can freely use materials of this site, but it would be nice if you place a link on https://avleonov.com and send message about it at me@avleonov.com or contact me any other way.
The exploit requires kconfig CONFIG_USER_NS=y; sh command sysctl kernel.unprivileged_userns_clone = 1; kconfig CONFIG_NF_TABLES=y. The author writes that this is the default for Debian, Ubuntu, and KernelCTF, and for other distributions it is necessary to test it.
The exploit does not work with kernels v6.4> with kconfig CONFIG_INIT_ON_ALLOC_DEFAULT_ON=y (including Ubuntu v6.5)
