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The Hacker News — Latest Cyber Security, Hacking & Tech News: privilege escalation

Over 40 Drivers Could Let Hackers Install Persistent Backdoor On Windows PCs

Over 40 Drivers Could Let Hackers Install Persistent Backdoor On Windows PCs
August 11, 2019Swati Khandelwal
If you own a device, or a hardware component, manufactured by ASUS, Toshiba, Intel, NVIDIA, Huawei, or other 15 other vendors listed below, you're probably screwed. A team of security researchers has discovered high-risk security vulnerabilities in more than 40 drivers from at least 20 different vendors that could allow attackers to gain most privileged permission on the system and hide malware in a way that remains undetected over time, sometimes for years. For sophisticated attackers, maintaining persistence after compromising a system is one of the most important tasks, and to achieve this, existing hardware vulnerabilities sometimes play an important role. One such component is a device driver, commonly known as a driver or hardware driver, a software program that controls a particular type of hardware device, helping it to communicate with the computer's operating system properly. Since device drivers sit between the hardware and the operating system itself and in

Hacker Discloses Second Zero-Day to Bypass Patch for Windows EoP Flaw

Hacker Discloses Second Zero-Day to Bypass Patch for Windows EoP Flaw
June 07, 2019Wang Wei
An anonymous security researcher going by the name of SandboxEscaper today publicly shared a second zero-day exploit that can be used to bypass a recently patched elevation of privilege vulnerability in the Microsoft Windows operating system. SandboxEscaper is known for publicly dropping zero-day exploits for unpatched Windows vulnerabilities. In the past year, the hacker has disclosed over half a dozen zero-day vulnerabilities in Windows OS without actually bothering to make Microsoft aware of the issues first. Just two weeks ago, the hacker disclosed four new Windows exploits , one of which was an exploit that could allow attackers to bypass a patched elevation of privilege vulnerability (CVE-2019-0841) in Windows that existed when Windows AppX Deployment Service (AppXSVC) improperly handles hard links. Now, the hacker claims to have found a new way to bypass Microsoft security patch for the same vulnerability, allowing a specially crafted malicious application to escalate its

PoC Exploit For Unpatched Windows 10 Zero-Day Flaw Published Online

PoC Exploit For Unpatched Windows 10 Zero-Day Flaw Published Online
May 22, 2019Mohit Kumar
An anonymous hacker with an online alias "SandboxEscaper" today released proof-of-concept (PoC) exploit code for a new zero-day vulnerability affecting Windows 10 operating system—that's his/her 5th publicly disclosed Windows zero-day exploit [ 1 , 2 , 3 ] in less than a year. Published on GitHub , the new Windows 10 zero-day vulnerability is a privilege escalation issue that could allow a local attacker or malware to gain and run code with administrative system privileges on the targeted machines, eventually allowing the attacker to gain full control of the machine. The vulnerability resides in Task Scheduler, a utility that enables Windows users to schedule the launch of programs or scripts at a predefined time or after specified time intervals. SandboxEscaper's exploit code makes use of SchRpcRegisterTask, a method in Task Scheduler to register tasks with the server, which doesn't properly check for permissions and can, therefore, be used to set an arb

New Apache Web Server Bug Threatens Security of Shared Web Hosts

New Apache Web Server Bug Threatens Security of Shared Web Hosts
April 02, 2019Wang Wei
Mark J Cox, one of the founding members of the Apache Software Foundation and the OpenSSL project, today posted a tweet warning users about a recently discovered important flaw in Apache HTTP Server software. The Apache web server is one of the most popular, widely used open-source web servers in the world that powers almost 40 percent of the whole Internet. The vulnerability, identified as CVE-2019-0211 , was discovered by Charles Fol , a security engineer at Ambionics Security firm, and patched by the Apache developers in the latest version 2.4.39 of its software released today. The flaw affects Apache HTTP Server versions 2.4.17 through 2.4.38 and could allow any less-privileged user to execute arbitrary code with root privileges on the targeted server. "In Apache HTTP Server 2.4 releases 2.4.17 to 2.4.38, with MPM event, worker or prefork, code executing in less-privileged child processes or threads (including scripts executed by an in-process scripting interprete

Snapd Flaw Lets Attackers Gain Root Access On Linux Systems

Snapd Flaw Lets Attackers Gain Root Access On Linux Systems
February 13, 2019Mohit Kumar
Ubuntu and some other Linux distributions suffer from a severe privilege escalation vulnerability that could allow a local attacker or a malicious program to obtain root privileges and total control over the targeted system. Dubbed " Dirty_Sock " and identified as CVE-2019-7304 , the vulnerability was discovered by security researcher Chris Moberly, who privately disclosed it to Canonical, the maker of Ubuntu, late last month. The vulnerability resides in the REST API for snapd service , a universal Linux packaging system that makes an application compatible for various Linux distributions without requiring any modification. Built by Canonical, snapd comes by default installed on all versions of Ubuntu and also used by other Linux distributions, including Debian, OpenSUSE, Arch Linux, Solus, and Fedora. Snap packages are basically applications compressed together with their dependencies that also includes instructions on how to run and interact with other software o

Latest iOS 12.1.4 Update Patches 2 Zero-Day and FaceTime Bugs

Latest iOS 12.1.4 Update Patches 2 Zero-Day and FaceTime Bugs
February 08, 2019Swati Khandelwal
Apple has finally released iOS 12.1.4 software update to patch the terrible Group FaceTime privacy bug that could have allowed an Apple user to call you via the FaceTime video chat service and hear or see you before you even pick up the call without your knowledge. The Facetime bug (CVE-2019-6223) was discovered by 14-year-old Grant Thompson of Catalina Foothills High School while he was trying to set up a Group FaceTime session with his friends. Thompson reported the bug to the company a week before it made headlines across the internet, forcing Apple to temporarily disable the group calling feature within FaceTime. In its advisory published Thursday, Apple described the bug as "a logic issue existed in the handling of Group FaceTime calls," that also impacted the group FaceTime calling feature on Apple's macOS Mojave 10.14.2. Along with Thompson, Apple has also credited Daven Morris of Arlington, Texas, in its official advisory for reporting this bug. Acc

New Systemd Privilege Escalation Flaws Affect Most Linux Distributions

New Systemd Privilege Escalation Flaws Affect Most Linux Distributions
January 10, 2019Wang Wei
Security researchers have discovered three vulnerabilities in Systemd, a popular init system and service manager for most Linux operating systems, that could allow unprivileged local attackers or malicious programs to gain root access on the targeted systems. The vulnerabilities, assigned as CVE-2018-16864, CVE-2018-16865, and CVE-2018-16866, actually resides in the "systemd-journald" service that collects information from different sources and creates event logs by logging information in the journal. The vulnerabilities, which were discovered and reported by security researchers at Qualys, affect all systemd-based Linux distributions, including Redhat and Debian , according to the researchers. However, some Linux distros such as SUSE Linux Enterprise 15, openSUSE Leap 15.0, and Fedora 28 and 29 are not affected, as "their userspace [code] is compiled with GCC's -fstack-clash-protection ." The first two flaws are memory corruptions issues, while the

Warning! Unprivileged Linux Users With UID > INT_MAX Can Execute Any Command

Warning! Unprivileged Linux Users With UID > INT_MAX Can Execute Any Command
December 06, 2018Mohit Kumar
Hold tight, this may blow your mind… A low-privileged user account on most Linux operating systems with UID value anything greater than 2147483647 can execute any systemctl command unauthorizedly—thanks to a newly discovered vulnerability. The reported vulnerability actually resides in PolicyKit (also known as polkit)—an application-level toolkit for Unix-like operating systems that defines policies, handles system-wide privileges and provides a way for non-privileged processes to communicate with privileged ones, such as "sudo," that does not grant root permission to an entire process. The issue, tracked as CVE-2018-19788 , impacts PolicyKit version 0.115 which comes pre-installed on most popular Linux distributions, including Red Hat , Debian ,  Ubuntu , and CentOS. The vulnerability exists due to PolicyKit's improper validation of permission requests for any low-privileged user with UID greater than INT_MAX. Where, INT_MAX is a constant in computer progra

New Privilege Escalation Flaw Affects Most Linux Distributions

New Privilege Escalation Flaw Affects Most Linux Distributions
October 26, 2018Mohit Kumar
An Indian security researcher has discovered a highly critical flaw in X.Org Server package that impacts OpenBSD and most Linux distributions, including Debian, Ubuntu, CentOS, Red Hat, and Fedora. Xorg X server is a popular open-source implementation of the X11 system (display server) that offers a graphical environment to a wider range of hardware and OS platforms. It serves as an intermediary between client and user applications to manage graphical displays. According to a blog post published by software security engineer Narendra Shinde , Xorg X server doesn't correctly handle and validate arguments for at least two command-line parameters, allowing a low-privileged user to execute malicious code and overwrite any file—including files owned by privileged users like root. The flaw, tracked as CVE-2018-14665 , was introduced in X.Org server 1.19.0 package that remained undetected for almost two years and could have been exploited by a local attacker on the terminal or vi

Google Hacker Discloses New Linux Kernel Vulnerability and PoC Exploit

Google Hacker Discloses New Linux Kernel Vulnerability and PoC Exploit
September 28, 2018Mohit Kumar
A cybersecurity researcher with Google Project Zero has released the details, and a proof-of-concept (PoC) exploit for a high severity vulnerability that exists in Linux kernel since kernel version 3.16 through 4.18.8. Discovered by white hat hacker Jann Horn, the kernel vulnerability (CVE-2018-17182) is a cache invalidation bug in the Linux memory management subsystem that leads to use-after-free vulnerability, which if exploited, could allow an attacker to gain root privileges on the targeted system. The use-after-free (UAF) vulnerabilities are a class of memory corruption bug that can be exploited by unprivileged users to corrupt or alter data in memory, enabling them to cause a denial of service (system crash) or escalate privileges to gain administrative access on a system. Linux Kernel Exploit Takes an Hour to Gain Root Access However, Horn says his PoC Linux kernel exploit made available to the public "takes about an hour to run before popping a root shell."

New Linux Kernel Bug Affects Red Hat, CentOS, and Debian Distributions

New Linux Kernel Bug Affects Red Hat, CentOS, and Debian Distributions
September 26, 2018Mohit Kumar
Security researchers have published the details and proof-of-concept (PoC) exploits of an integer overflow vulnerability in the Linux kernel that could allow an unprivileged user to gain superuser access to the targeted system. The vulnerability, discovered by cloud-based security and compliance solutions provider Qualys, which has been dubbed "Mutagen Astronomy," affects the kernel versions released between July 2007 and July 2017, impacting the Red Hat Enterprise Linux, CentOS, and Debian distributions. The Mutagen Astronomy vulnerability tracked as CVE-2018-14634, is a type of a local privilege escalation issue—one of the most common issues with operating systems as a whole—and exists in the Linux kernel's create_elf_tables() function that operates the memory tables. To successfully exploit this vulnerability, attackers need to have access to the targeted system and run their exploit that leads to a buffer overflow, thereby resulting in the execution of malici

Flaw in 4GEE WiFi Modem Could Leave Your Computer Vulnerable

Flaw in 4GEE WiFi Modem Could Leave Your Computer Vulnerable
September 21, 2018Swati Khandelwal
A high-severity vulnerability has been discovered in 4G-based wireless 4GEE Mini modem sold by mobile operator EE that could allow an attacker to run a malicious program on a targeted computer with the highest level of privileges in the system. The vulnerability—discovered by 20-year-old Osanda Malith , a Sri Lankan security researcher at ZeroDayLab—can be exploited by a low privileged user account to escalate privileges on any Windows computer that had once connected to the EE Mini modem via USB. This, in turn, would allow an attacker to gain full system access to the targeted remote computer and thereby, perform any malicious actions, such as installing malware, rootkits, keylogger, or stealing personal information. 4G Mini WiFi modem is manufactured by Alcatel and sold by EE, a mobile operator owned by BT Group— Britain's largest digital communications company that serves over 31 million connections across its mobile, fixed and wholesale networks. How Does the Attack

Hacker Discloses Unpatched Windows Zero-Day Vulnerability (With PoC)

Hacker Discloses Unpatched Windows Zero-Day Vulnerability (With PoC)
August 28, 2018Swati Khandelwal
A security researcher has publicly disclosed the details of a previously unknown zero-day vulnerability in the Microsoft's Windows operating system that could help a local user or malicious program obtain system privileges on the targeted machine. And guess what? The zero-day flaw has been confirmed working on a "fully-patched 64-bit Windows 10 system." The vulnerability is a privilege escalation issue which resides in the Windows' task scheduler program and occured due to errors in the handling of Advanced Local Procedure Call (ALPC) systems. Advanced local procedure call (ALPC) is an internal mechanism, available only to Windows operating system components, that facilitates high-speed and secure data transfer between one or more processes in the user mode. The revelation of the Windows zero-day came earlier today from a Twitter user with online alias SandboxEscaper, who also posted a link to a Github page hosting a proof-of-concept (PoC) exploit for the

Adobe releases important security patches for its 4 popular software

Adobe releases important security patches for its 4 popular software
August 14, 2018Mohit Kumar
Adobe has released August 2018 security patch updates for a total of 11 vulnerabilities in its products, two of which are rated as critical that affect Adobe Acrobat and Reader software. The vulnerabilities addressed in this month updates affect Adobe Flash Player, Creative Cloud Desktop Application, Adobe Experience Manager, Adobe Acrobat and Reader applications. None of the security vulnerabilities patched this month were either publicly disclosed or found being actively exploited in the wild. Adobe Acrobat and Reader (Windows and macOS) Security researchers from Trend Micro's Zero Day Initiative and Cybellum Technologies have discovered and reported two critical arbitrary code execution vulnerabilities respectively in Acrobat DC and Acrobat Reader DC for Windows and macOS. According to the Adobe advisory, the flaw (CVE-2018-12808) reported by Cybellum Technologies is an out-of-bounds write flaw, whereas the bug (CVE-2018-12799) reported by Zero Day Initiative is an

15-Year-Old Apple macOS 0-Day Kernel Flaw Disclosed, Allows Root Access

15-Year-Old Apple macOS 0-Day Kernel Flaw Disclosed, Allows Root Access
January 02, 2018Swati Khandelwal
A security researcher on New Year's eve made public the details of an unpatched security vulnerability in Apple's macOS operating system that can be exploited to take complete control of a system. On the first day of 2018, a researcher using the online moniker Siguza released the details of the unpatched zero-day macOS vulnerability, which he suggests is at least 15 years old, and proof-of-concept (PoC) exploit code on GitHub . The bug is a serious local privilege escalation (LPE) vulnerability that could enable an unprivileged user (attacker) to gain root access on the targeted system and execute malicious code. Malware designed to exploit this flaw could fully install itself deep within the system. From looking at the source, Siguza believes this vulnerability has been around since at least 2002, but some clues suggest the flaw could actually be ten years older than that. "One tiny, ugly bug. Fifteen years. Full system compromise," he wrote. This local p

Yet Another Linux Kernel Privilege-Escalation Bug Discovered

Yet Another Linux Kernel Privilege-Escalation Bug Discovered
October 16, 2017Wang Wei
Security researchers have discovered a new privilege-escalation vulnerability in Linux kernel that could allow a local attacker to execute code on the affected systems with elevated privileges. Discovered by Venustech ADLab (Active-Defense Lab) researchers, the Linux kernel vulnerability (CVE-2017-15265) is due to a use-after-free memory error in the Advanced Linux Sound Architecture (ALSA) sequencer interface of the affected application. The Advanced Linux Sound Architecture (ALSA) provides audio and MIDI functionality to the Linux operating system, and also bundles a userspace driven library for application developers, enabling direct (kernel) interaction with sound devices through ALSA libraries. Successful exploitation of this vulnerability requires an attacker—with local access on the targeted system—to execute a maliciously crafted application on a targeted system, which allows the attacker to elevate his privilege to root on the targeted system, a Cisco advisory warned

2-Year-Old Linux Kernel Issue Resurfaces As High-Risk Flaw

2-Year-Old Linux Kernel Issue Resurfaces As High-Risk Flaw
September 28, 2017Unknown
A bug in Linux kernel that was discovered two years ago, but was not considered a security threat at that time, has now been recognised as a potential local privilege escalation flaw. Identified as CVE-2017-1000253, the bug was initially discovered by Google researcher Michael Davidson in April 2015. Since it was not recognised as a serious bug at that time, the patch for this kernel flaw was not backported to long-term Linux distributions in kernel 3.10.77. However, researchers at Qualys Research Labs has now found that this vulnerability could be exploited to escalate privileges and it affects all major Linux distributions, including Red Hat, Debian, and CentOS. The vulnerability left "all versions of CentOS 7 before 1708 (released on September 13, 2017), all versions of Red Hat Enterprise Linux 7 before 7.4 (released on August 1, 2017), and all versions of CentOS 6 and Red Hat Enterprise Linux 6 are exploitable," Qualys said in an advisory published yesterday.

Critical Flaws Found in Windows NTLM Security Protocol – Patch Now

Critical Flaws Found in Windows NTLM Security Protocol – Patch Now
July 12, 2017Swati Khandelwal
As part of this month's Patch Tuesday , Microsoft has released security patches for a serious privilege escalation vulnerability which affect all versions of its Windows operating system for enterprises released since 2007. Researchers at behavioral firewall specialist Preempt discovered two zero-day vulnerabilities in Windows NTLM security protocols, both of which allow attackers to create a new domain administrator account and get control of the entire domain. NT LAN Manager (NTLM) is an old authentication protocol used on networks that include systems running the Windows operating system and stand-alone systems. Although NTLM was replaced by Kerberos in Windows 2000 that adds greater security to systems on a network, NTLM is still supported by Microsoft and continues to be used widely. The first vulnerability involves unprotected Lightweight Directory Access Protocol (LDAP) from NTLM relay, and the second impact Remote Desktop Protocol (RDP) Restricted-Admin mode. L

A Decade Old Unix/Linux/BSD Root Privilege-Escalation Bug Discovered

A Decade Old Unix/Linux/BSD Root Privilege-Escalation Bug Discovered
June 20, 2017Swati Khandelwal
Update: Find working Exploits and Proof-of-Concepts at the bottom of this article. Security researchers have discovered more than a decade-old vulnerability in several Unix-based operating systems — including Linux, OpenBSD, NetBSD, FreeBSD and Solaris — which can be exploited by attackers to escalate their privileges to root, potentially leading to a full system takeover. Dubbed Stack Clash , the vulnerability ( CVE-2017-1000364 ) has been discovered in the way memory was being allocated on the stack for user space binaries. Exploiting Stack Clash Bug to Gain Root Access The explanation is simple: Each program uses a special memory region called the stack, which is used to store short-term data. It expands and contracts automatically during the execution of any program, depending upon the needs of that program. According to researchers at Qualys, who discovered and reported this bug, a malicious program can attempt to use more memory space than available on the stack,

11-Year Old Linux Kernel Local Privilege Escalation Flaw Discovered

11-Year Old Linux Kernel Local Privilege Escalation Flaw Discovered
February 22, 2017Swati Khandelwal
Another privilege-escalation vulnerability has been discovered in Linux kernel that dates back to 2005 and affects major distro of the Linux operating system, including Redhat, Debian, OpenSUSE, and Ubuntu. Over a decade old Linux Kernel bug ( CVE-2017-6074 ) has been discovered by security researcher Andrey Konovalov in the DCCP (Datagram Congestion Control Protocol) implementation using Syzkaller , a kernel fuzzing tool released by Google. The vulnerability is a use-after-free flaw in the way the Linux kernel's "DCCP protocol implementation freed SKB (socket buffer) resources for a DCCP_PKT_REQUEST packet when the IPV6_RECVPKTINFO option is set on the socket." The DCCP double-free vulnerability could allow a local unprivileged user to alter the Linux kernel memory, enabling them to cause a denial of service ( system crash ) or escalate privileges to gain administrative access on a system. "An attacker can control what object that would be and overwrite
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