A use-after-free condition was present in the Linux 4.9 kernel TCP socket handling code, triggerable by a low privilege local user. The included POC triggers multiple read and write UAF conditions. Additionally, the POC causes a kernel crash on a vanilla Debian build.
read moreBy setting a specific socket option, an attacker can control a pointer in kernel land and cause a general protection fault, or potentially execute arbitrary code. The issue can be triggered by running the included POC as root, inside a default LXC container or with CAP_NET_ADMIN privileges. This issue was confirmed on Debian Stretch (kernel 4.9.168), however Debian have advised that this issue also affects older kernel versions. This issue may also be triggered by a low privileged user that can unshare their user and network namespaces.
I recently had the chance to set up a few security automation bits and pieces, and figured I’d go ahead and detail some of my thoughts on a few quick wins. We’ll look at assigning code owners for security sensitive source code, extending linters to keep bugs from re-appearing in the future and automating alerting on third party library vulnerabilities. These techniques give a low-false-positive rate, and provide a simpler way to get started with security automation rather than attempting to cobble together full-fat static and dynamic security analysis right off the bat.
Containers aren’t really a thing. They’re a mishmash of Linux kernel-isms like namespaces and cgroups. I wanted to write a rootkit that would make exploiting privileged docker containers easier, and learn about how these kernel-isms are implemented along the way. This post is going to take a look at three kernel-module specific techniques to escape a privileged container, ranging from easy-peasy-lemon-squeezy to difficult-difficult-lemon-difficult.
atftpd contained multiple vulnerabilities, including stack buffer overflow, concurrency issues and heap-based read overflow.
read moreBy default, Microsoft BitLocker protected OS drives can be accessed by sniffing the LPC bus, retrieving the volume master key when it’s returned by the TPM, and using the retrieved VMK to decrypt the protected drive. This post will look at extracting the clear-text key from a TPM chip by sniffing the LPC bus, either with a logic analyzer or a cheap FPGA board. This post demonstrates the attack against an HP laptop logic board using a TPM1.2 chip and a Surface Pro 3 using a TPM2.0 chip. From bus wiring through to volume decryption. Source code included.
Kanboard 1.2.7 contains multiple vulnerabilities. The vulnerabilities include CSV account import cross site request forgery which allows an unauthenticated attacker to create a new administrative user. Cross site request forgery 2FA deactivation, allowing an unauthenticated attacker to disable an account’s 2FA configuration. A lack of integrity checking or transport layer encryption enforced on plugins enables remote code execution by a malicious admin. Other vulnerabilities include: session privilege retention, 2FA bypass, database user_id and pre-2FA information disclosure.
Go-pandoc is vulnerable to remote code execution through a user included LUA filter. An attacker can upload a LUA file to a known location on the file system due to a predictable temporary directory being used when handling certain file type includes. The uploaded LUA file can then be used as a filter in a subsequent request, allowing for the execution of arbitrary LUA code.
read moreAn attacker may send the rsync daemon a crafted packet, triggering an out-of-bound memory read in the argument handling code.
We’re coming across more and more instances of Office 365 accounts with suspicious activity. Unfortunately the logging defaults in Office 365 are unsatisfactory and a little additional configuration is required to improve the effectiveness of the logging, especially in regards to user activity.
A memory corruption vulnerability exists in Microsoft DirectX. The corruption happens as a result of the incorrect handling of text, while running CSS tranformations, resulting in an out-of-bounds-read. It is possible to trigger this vulnerability remotely via Internet Explorer. An attacker can use this vulnerability to disclose memory of a victim’s machine. Generally, such vulnerability is chained with a Remote Code Execution vulnerability and used to bypass common defenses.
read moreIn this article I’ll be taking a look at the CAN bus network in a 2009 Ducati 848. How to find the bus, confirm the high and low lines with a scope and analyse messages with a Linux box and socket-CAN. The aim of the game is to identify a way to get onto the bus, and then analyse the messages going across the bus. We’ll end up figuring out how to log the throttle position and RPM data, how the immobilizer is implemented and how to bypass it.
Sourcemaps are intended to make debugging minified JavaScript less of a pain. This article will take a closer look at Sourcemaps and discuss retrieving the original source code tree from a downloaded Sourcemap file.
Can you tell me how to get, how to get shells on OpenCPU…
The Network Manager VPNC plugin is vulnerable to a privilege escalation attack. A new line character can be used to inject a Password helper parameter into the configuration data passed to VPNC, allowing an attacker to execute arbitrary commands as root.
read moreTwo vulnerabilities were discovered within the Oracle WebLogic SAML service provider authentication mechanism. By inserting an XML comment into the SAML NameID tag, an attacker can coerce the SAML service provider to log in as another user. Additionally, WebLogic does not require signed SAML assertions in the default configuration. By omitting the signature portions from a SAML assertion, an attacker can craft an arbitrary SAML assertion and bypass the authentication mechanism.
Pulse Security has identified two vulnerabilities in the ManageEngine OpManager software currently being exploited in the wild, and one observational note. This document details the vulnerabilities and the indicators of compromise that may be used to identify these exploits.
read moreA memory corruption vulnerability exists in Microsoft Internet Explorer. The corruption happens due to the destruction and reuse of an element processed by Internet Explorer. An attacker can use this vulnerability to obtain Remote Code Execution and compromise a victim’s machine. Microsoft fixed this vulnerability in the June 2018 patch cycle. Pulse Security recommends applying the latest updates to mitigate this vulnerability.
read morePhusion Passenger’s Nginx module is vulnerable to a privilege escalation vulnerability when run with a non-standard passenger_instance_registry_dir configuration. A vulnerability exists when creating the control_process.pid file, specifically when the file’s owner is changed from root. An attacker can use this behavior to escalate privileges from the www-data user to the root user when Nginx is restarted.
When it comes to offensive security, engagements can be broadly broken up into two categories: Penetration testing and red teaming. Understanding the differences between the two is essential when attempting to verify the security of an application, network or organisation.
A memory corruption vulnerability exists in Microsoft Internet Explorer. The corruption happens as a result of the destruction and reuse of an element processed by Internet Explorer. An attacker can use this vulnerability to obtain Remote Code Execution and compromise a victim’s machine.
read moreMultiple vulnerabilities were discovered in Pi-Hole, a DNS blocker solution. Vulnerabilities included remote code execution, cross-site scripting, sql injection, privilege escalation and stack-based buffer overflow.
read moreA memory corruption vulnerability exists in Microsoft Edge and Internet Explorer. The corruption happens as a result of incorrect handling of SVG attributes. An attacker can use this vulnerability to disclose memory of a victim’s machine. Generally, such vulnerability is chained with a Remote Code Execution vulnerability and used to bypass common defenses.
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