Exploit for Improper Restriction of Operations within the Bounds of a Memory Buffer in Microsoft

This is a proof-of-concept PoC exploit for CVE-2020-0796, also known as SMBGhost. The exploit targets a remote code execution vulnerability in the Windows SMBv3 server. The PoC is written in Python and uses a shellcode written in x64 assembly language. The PoC consists of two main components: 1. ...

Linux/x86 Tiny Read Polymorphic Shellcode (75 bytes)

Title: Linux/x86 - Tiny Read Polymorphic Shellcode 75 bytes Author: Xenofon Vassilakopoulos Tested on: Linux 3.13.0-32-generic 57precise1-Ubuntu i686 i386 GNU/Linux Blog: https://xenovass.wordpress.com/2019/06/26/slae-assignment-6-create-polymorphic-shellcode/ Architecture: i686 GNU/Linux Shellco...

Linux/x64_86 ROL Encoded Execve Shellcode (57 bytes)

57 bytes small Linux/x6486 /bin/bash shellcode. The stub decodes the ROL Encoded shellcode. When the stub has finished decoding the payload, execution control is passed to the payload. // Shellcode Title: Linux/x64 - ROL Encoded Execve Shellcode 57 bytes // Shellcode Author: Bobby Cooke // Tested...

Linux/x86 Egghunter Shellcode (39 bytes)

39 bytes small Linux/x86 egghunter null-free shellcode. The egghunter dynamically searches memory for 2 instances of the egg. When the eggs are found, the egghunter passes execution control to the payload at the memory address of the eggs. // Shellcode Title: Linux/x86 - EggHunter + Null-free 39...

Out-of-bounds

An issue was discovered in Contiki-NG through 4.3 and Contiki through 3.0. An out of bounds write is present in the data section during 6LoWPAN fragment re-assembly in the face of forged fragment offsets in os/net/ipv6/sicslowpan.c...

CVE-2019-8359

An issue was discovered in Contiki-NG through 4.3 and Contiki through 3.0. An out of bounds write is present in the data section during 6LoWPAN fragment re-assembly in the face of forged fragment offsets in os/net/ipv6/sicslowpan.c...

Service Update 0.14 for Microsoft Dynamics 365 9.0

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Execute .net Assembly (x64 only)

This module executes a .NET assembly in memory. It reflectively loads a dll that will host CLR, then it copies the assembly to be executed into memory. Credits for AMSI bypass to Rastamouse @RastaMouse This module requires Metasploit: https://metasploit.com/download Current source:...

RHEL 7 : libreoffice (RHSA-2020:1151)

The remote Redhat Enterprise Linux 7 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2020:1151 advisory. LibreOffice is an open source, community-developed office productivity suite. It includes key desktop applications, such as a word processor...

SharpRDP - Remote Desktop Protocol .NET Console Application For Authenticated Command Execution

To compile open the project in Visual Studio and build for release. Two DLLs will be output to the Release directory, you do not need those because the DLLs are in the assembly. If you do not want to use the provided DLLs you will need to .NET SDK to create the AxMSTSCLib.dll DLL. To create it...

Valve: OOB reads in network message handlers leads to RCE

Vulnerability In Source engine games there are many network messages sent from the server to the client that take an entity index. There is a common pattern among many of these messages for the lower bounds of the entity index to be checked but not the upper bounds. In many cases these out of bou...

Huawei EulerOS: Security Advisory for libreoffice (EulerOS-SA-2019-2169)

The remote host is missing an update for the Huawei EulerOS SPDX-FileCopyrightText: 2020 Greenbone AG Some text descriptions might be excerpted from a referenced sources, and are Copyright C by the respective right holders. SPDX-License-Identifier: GPL-2.0-only ifdescription...

Windows/7 - Screen Lock Shellcode (9 bytes)

Title: Windows/7 - Screen Lock Shellcode 9 bytes Author: Saswat Nayak Date: 2020-01-22 Shellcode length 9 Tested on: Win 7 SP1-64 / Assembly code follows xor eax,eax xor ebx,ebx xor ecx,ecx mov eax,0x00000002 mov ebx,0x00020000 push ebx push al mov ecx,0x77661497 call ecx / char code=...

The Basics of Exploit Development 1: Win32 Buffer Overflows

In this article we will cover the creation of an exploit for a 32-bit Windows application vulnerable to a buffer overflow using X64dbg and the associated ERC plugin. As this is the first article in this series, we will be looking at an exploit where we have a complete EIP overwrite and ESP points...

EulerOS Virtualization for ARM 64 3.0.5.0 : libgcrypt (EulerOS-SA-2020-1085)

According to the versions of the libgcrypt package installed, the EulerOS Virtualization for ARM 64 installation on the remote host is affected by the following vulnerabilities : - It was discovered that there was a ECDSA timing attack in the libgcrypt20 cryptographic library. Version affected:...

openSUSE: Security Advisory for go1.12 (openSUSE-SU-2019:2085-1)

The remote host is missing an update for the Copyright C 2020 Greenbone Networks GmbH Some text descriptions might be excerpted from a referenced sources, and are Copyright C by the respective right holders. SPDX-License-Identifier: GPL-2.0-or-later This program is free software; you can...

Netwide Assembler Buffer Overflow Vulnerability (CNVD-2020-02979)

Netwide Assembler NASM is a Linux-based assembler. The product is capable of creating binaries and writing bootloaders. A buffer overflow vulnerability exists in the expr function of the asm/eval.c file in version 2.14.02 of Netwide Assembler NASM. The vulnerability stems from a networked system ...

DEBIAN-CVE-2019-20352

In Netwide Assembler NASM 2.15rc0, a heap-based buffer over-read occurs via a crafted .asm file in settextfree when called from expandonesmacro in asm/preproc.c...

SysWhispers - AV/EDR Evasion Via Direct System Calls

SysWhispers helps with evasion by generating header/ASM files implants can use to make direct system calls. All core syscalls are supported from Windows XP to 10. Example generated files available in example-output/. Introduction Various security products place hooks in user-mode APIs which allow...

Telerik UI - Remote Code Execution via Insecure Deserialization

See the full write-up at Bishop Fox, CVE-2019-18935: https://know.bishopfox.com/research/cve-2019-18935-remote-code-execution-in-telerik-ui, for a complete walkthrough of vulnerability and exploit details for this issue along with patching instructions. Install git clone...