Denial-of-Service | Breaking Cybersecurity News | The Hacker News

Microsoft on Thursday disclosed four medium-severity security flaws in the open-source OpenVPN software that could be chained to achieve remote code execution (RCE) and local privilege escalation (LPE). "This attack chain could enable attackers to gain full control over targeted endpoints, potentially resulting in data breaches, system compromise, and unauthorized access to sensitive information," Vladimir Tokarev of the Microsoft Threat Intelligence Community said . That said, the exploit, presented by Black Hat USA 2024, requires user authentication and an advanced understanding of OpenVPN's inner workings. The flaws affect all versions of OpenVPN prior to version 2.6.10 and 2.5.10. The list of vulnerabilities is as follows - CVE-2024-27459 - A stack overflow vulnerability leading to a Denial-of-service (DoS) and LPE in Windows CVE-2024-24974 - Unauthorized access to the "\\openvpn\\service" named pipe in Windows, allowing an attacker to remotely inte...

Google has warned that a security flaw impacting Pixel Firmware has been exploited in the wild as a zero-day. The high-severity vulnerability, tagged as CVE-2024-32896 , has been described as an elevation of privilege issue in Pixel Firmware. The company did not share any additional details related to the nature of attacks exploiting it, but noted "there are indications that CVE-2024-32896 may be under limited, targeted exploitation." The June 2024 security update addresses a total of 50 security vulnerabilities, five of which relate to various components in Qualcomm chipsets. Some of the notable issues patched include denial-of-service (DoS) issue impacting Modem, and numerous information disclosure flaws affecting GsmSs, ACPM, and Trusty.  The updates are available for supported Pixel devices , such as Pixel 5a with 5G, Pixel 6a, Pixel 6, Pixel 6 Pro, Pixel 7, Pixel 7 Pro, Pixel 7a, Pixel 8, Pixel 8 Pro, Pixel 8a, and Pixel Fold. Earlier this April, Google resolved...

Are you using the cloud or thinking about transitioning? Undoubtedly, multi-cloud and hybrid environments offer numerous benefits for organizations. However, the cloud's flexibility, scalability, and efficiency come with significant risk — an expanded attack surface. The decentralization that comes with utilizing multi-cloud environments can also lead to limited visibility into user activity and poor access management.  Privileged accounts with access to your critical systems and sensitive data are among the most vulnerable elements in cloud setups. When mismanaged, these accounts open the doors to unauthorized access, potential malicious activity, and data breaches. That's why strong privileged access management (PAM) is indispensable. PAM plays an essential role in addressing the security challenges of complex infrastructures by enforcing strict access controls and managing the life cycle of privileged accounts. By employing PAM in hybrid and cloud environments, you're not...

Microsoft has released security updates to address 51 flaws as part of its Patch Tuesday updates for June 2024. Of the 51 vulnerabilities, one is rated Critical and 50 are rated Important. This is in addition to 17 vulnerabilities resolved in the Chromium-based Edge browser over the past month. None of the security flaws have been actively exploited in the wild, with one of them listed as publicly known at the time of the release. This concerns a third-party advisory tracked as CVE-2023-50868 (CVSS score: 7.5), a denial-of-service issue impacting the DNSSEC validation process that could cause CPU exhaustion on a DNSSEC-validating resolver. It was reported by researchers from the National Research Center for Applied Cybersecurity (ATHENE) in Darmstadt back in February, alongside KeyTrap ( CVE-2023-50387 , CVSS score: 7.5). "NSEC3 is an improved version of NSEC (Next Secure) that provides authenticated denial of existence," Tyler Reguly, associate director of Security...

Cybersecurity researchers have discovered a critical security flaw in a popular logging and metrics utility called Fluent Bit that could be exploited to achieve denial-of-service (DoS), information disclosure, or remote code execution. The vulnerability, tracked as  CVE-2024-4323 , has been codenamed Linguistic Lumberjack by Tenable Research. It impacts versions from 2.0.7 through 3.0.3, with fixes  available  in  version 3.0.4 . The issue relates to a case of memory corruption in Fluent Bit's built-in HTTP server that could allow for DoS, information leakage, or remote code execution. Specifically, it relates to sending maliciously crafted requests to the  monitoring API  through endpoints such as /api/v1/traces and /api/v1/trace. "Regardless of whether or not any traces are configured, it is still possible for any user with access to this API endpoint to query it," security researcher Jimi Sebree  said . "During the parsing of incomi...

A never-before-seen botnet called  Goldoon  has been observed targeting D-Link routers with a nearly decade-old critical security flaw with the goal of using the compromised devices for further attacks. The vulnerability in question is  CVE-2015-2051  (CVSS score: 9.8), which affects D-Link DIR-645 routers and allows remote attackers to  execute arbitrary commands  by means of specially crafted HTTP requests. "If a targeted device is compromised, attackers can gain complete control, enabling them to extract system information, establish communication with a C2 server, and then use these devices to launch further attacks, such as distributed denial-of-service (DDoS)," Fortinet FortiGuard Labs researchers Cara Lin and Vincent Li  said . Telemetry data from the network security company points to a spike in the botnet activity around April 9, 2024. It all starts with the exploitation of CVE-2015-2051 to ret...

Threat actors are actively scanning and exploiting a pair of security flaws that are said to affect as many as 92,000 internet-exposed D-Link network-attached storage (NAS) devices. Tracked as  CVE-2024-3272  (CVSS score: 9.8) and  CVE-2024-3273  (CVSS score: 7.3), the vulnerabilities impact  legacy D-Link products  that have reached end-of-life (EoL) status. D-Link, in an  advisory , said it does not plan to ship a patch and instead urges customers to replace them. "The vulnerability lies within the nas_sharing.cgi uri, which is vulnerable due to two main issues: a backdoor facilitated by hard-coded credentials, and a command injection vulnerability via the system parameter," security researcher who goes by the name netsecfish  said  in late March 2024. Successful exploitation of the flaws could lead to arbitrary command execution on the affected D-Link NAS devices, granting threat actors the ability to access sensitive information, alt...

Ivanti has released security updates to address four security flaws impacting Connect Secure and Policy Secure Gateways that could result in code execution and denial-of-service (DoS). The list of flaws is as follows - CVE-2024-21894  (CVSS score: 8.2) - A heap overflow vulnerability in the IPSec component of Ivanti Connect Secure (9.x, 22.x) and Ivanti Policy Secure allows an unauthenticated malicious user to send specially crafted requests in order to crash the service thereby causing a DoS attack. In certain conditions, this may lead to execution of arbitrary code. CVE-2024-22052  (CVSS score: 7.5) - A null pointer dereference vulnerability in IPSec component of Ivanti Connect Secure (9.x, 22.x) and Ivanti Policy Secure allows an unauthenticated malicious user to send specially crafted requests in order to crash the service thereby causing a DoS attack. CVE-2024-22053  (CVSS score: 8.2) - A heap overflow vulnerability in the IPSec component of Ivanti Connect ...

Details have emerged about a vulnerability impacting the "wall" command of the util-linux package that could be potentially exploited by a bad actor to leak a user's password or alter the clipboard on certain Linux distributions. The bug, tracked as CVE-2024-28085, has been codenamed  WallEscape  by security researcher Skyler Ferrante. It has been described as a case of improper neutralization of escape sequences. "The util-linux wall command does not filter  escape sequences  from command line arguments," Ferrante  said . "This allows unprivileged users to put arbitrary text on other users' terminals, if mesg is set to "y" and wall is setgid." The  vulnerability  was introduced as part of a  commit  made in August 2013.  The "wall" command is used to write a message to the terminals of all users that are currently logged in to a server, essentially allowing users with elevated permissions to  broadcast key information  t...

A novel denial-of-service (DoS) attack vector has been found to target application-layer protocols based on User Datagram Protocol (UDP), putting hundreds of thousands of hosts likely at risk. Called  Loop DoS attacks , the  approach  pairs "servers of these protocols in such a way that they communicate with each other indefinitely," researchers from the CISPA Helmholtz-Center for Information Security said. UDP, by design, is a  connectionless protocol  that does not validate source IP addresses, making it susceptible to IP spoofing. Thus, when attackers forge several UDP packets to include a victim IP address, the destination server responds to the victim (as opposed to the threat actor), creating a reflected denial-of-service (DoS) attack. The latest study found that certain implementations of the UDP protocol, such as DNS, NTP, TFTP, Active Users, Daytime, Echo, Chargen, QOTD, and Time, can be weaponized to create a self-perpetuating attack loop. "It p...

Cybersecurity researchers have discovered an updated variant of a stealer and malware loader called  BunnyLoader  that modularizes its various functions as well as allow it to evade detection. "BunnyLoader is dynamically developing malware with the capability to steal information, credentials and cryptocurrency, as well as deliver additional malware to its victims," Palo Alto Networks Unit 42  said  in a report published last week. The new version, dubbed BunnyLoader 3.0, was announced by its developer named Player (or Player_Bunny) on February 11, 2024, with rewritten modules for data theft, reduced payload size, and enhanced keylogging capabilities. BunnyLoader was  first documented  by Zscaler ThreatLabz in September 2023, describing it as a malware-as-a-service (MaaS) designed to harvest credentials and facilitate cryptocurrency theft. It was initially offered on a subscription basis for $250 per month. The malware has since undergone frequent upd...

The decentralized social network Mastodon has disclosed a critical security flaw that enables malicious actors to impersonate and take over any account. "Due to insufficient origin validation in all Mastodon, attackers can impersonate and take over any remote account," the maintainers said in a terse advisory. The vulnerability, tracked as  CVE-2024-23832 , has a severity rating of 9.4 out of a maximum of 10. Security researcher  arcanicanis  has been credited with discovering and reporting it. It has been described as an "origin validation error" ( CWE-346 ), which can typically allow an attacker to "access any functionality that is inadvertently accessible to the source." Every Mastodon version prior to 3.5.17 is vulnerable, as are 4.0.x versions before 4.0.13, 4.1.x versions before 4.1.13, and 4.2.x versions before 4.2.5. Mastodon said it's withholding additional technical specifics about the flaw until February 15, 2024, to give  admins  ampl...

Juniper Networks has released out-of-band updates to  address high-severity flaws  in SRX Series and EX Series that could be exploited by a threat actor to take control of susceptible systems. The vulnerabilities, tracked as  CVE-2024-21619 and CVE-2024-21620 , are rooted in the J-Web component and impact all versions of Junos OS. Two other shortcomings, CVE-2023-36846 and CVE-2023-36851, were  previously disclosed  by the company in August 2023. CVE-2024-21619  (CVSS score: 5.3) - A missing authentication vulnerability that could lead to exposure of sensitive configuration information CVE-2024-21620  (CVSS score: 8.8) - A cross-site scripting (XSS) vulnerability that could lead to the execution of arbitrary commands with the target's permissions by means of a specially crafted request Cybersecurity firm watchTowr Labs has been  credited  with discovering and reporting the issues. The two vulnerabilities have been addressed in the foll...

Multiple security vulnerabilities have been disclosed in the TCP/IP network protocol stack of an open-source reference implementation of the Unified Extensible Firmware Interface ( UEFI ) specification used widely in modern computers. Collectively dubbed  PixieFail  by Quarkslab, the  nine issues  reside in the TianoCore EFI Development Kit II ( EDK II ) and could be exploited to achieve remote code execution, denial-of-service (DoS), DNS cache poisoning, and leakage of sensitive information. UEFI firmware – which is responsible for  booting the operating system  – from AMI, Intel, Insyde, and Phoenix Technologies are impacted by the shortcomings. EDK II incorporates its own TCP/IP stack called  NetworkPkg  to enable network functionalities available during the initial Preboot eXecution Environment ( PXE , pronounced "pixie") stage, which allows for management tasks in the absence of a running operating system. In other words, it is a client...

Over 178,000 SonicWall firewalls exposed over the internet are exploitable to at least one of the two security flaws that could be potentially exploited to cause a denial-of-service (DoS) condition and remote code execution (RCE). "The two issues are fundamentally the same but exploitable at different HTTP URI paths due to reuse of a vulnerable code pattern," Jon Williams, a senior security engineer at Bishop Fox,  said  in a technical analysis shared with The Hacker News. The vulnerabilities in question are listed below - CVE-2022-22274  (CVSS score: 9.4) - A stack-based buffer overflow vulnerability in the SonicOS via HTTP request allows a remote, unauthenticated attacker to cause DoS or potentially result in code execution in the firewall. CVE-2023-0656  (CVSS score: 7.5) - A stack-based buffer overflow vulnerability in the SonicOS allows a remote, unauthenticated attacker to cause DoS, which could result in a crash. While there are no reports of exploi...

Juniper Networks has released updates to fix a critical remote code execution (RCE) vulnerability in its SRX Series firewalls and EX Series switches. The issue, tracked as  CVE-2024-21591 , is rated 9.8 on the CVSS scoring system. "An out-of-bounds write vulnerability in J-Web of Juniper Networks Junos OS SRX Series and EX Series allows an unauthenticated, network-based attacker to cause a Denial-of-Service (DoS) or Remote Code Execution (RCE) and obtain root privileges on the device," the company  said  in an advisory. The networking equipment major, which is set to be  acquired by Hewlett Packard Enterprise (HPE)  for $14 billion, said the issue is caused by use of an insecure function allowing a bad actor to overwrite arbitrary memory. The flaw impacts the following versions, and has been fixed in versions 20.4R3-S9, 21.2R3-S7, 21.3R3-S5, 21.4R3-S5, 22.1R3-S4, 22.2R3-S3, 22.3R3-S2, 22.4R2-S2, 22.4R3, 23.2R1-S1, 23.2R2, 23.4R1, and later - Junos OS ver...

Microsoft released its final set of Patch Tuesday updates for 2023, closing out 34 flaws in its software, making it one of the lightest releases in recent years. Of the 34 shortcomings, four are rated Critical and 30 are rated Important in severity. The fixes are in addition to  18 flaws  Microsoft addressed in its Chromium-based Edge browser since the release of  Patch Tuesday updates for November 2023 . According to data from the  Zero Day Initiative , the software giant has patched more than 900 flaws this year, making it one of the busiest years for Microsoft patches. For comparison, Redmond resolved 917 CVEs in 2022. While none of the vulnerabilities are listed as publicly known or under active attack at the time of release, some of the notable ones are listed below - CVE-2023-35628  (CVSS score: 8.1) - Windows MSHTML Platform Remote Code Execution Vulnerability CVE-2023-35630  (CVSS score: 8.8) - Internet Connection Sharing (ICS) Remote Code E...