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The Hacker News - Cybersecurity News and Analysis: Log4Shell

Log4Shell Still Being Exploited to Hack VMWare Servers to Exfiltrate Sensitive Data

Log4Shell Still Being Exploited to Hack VMWare Servers to Exfiltrate Sensitive Data

June 23, 2022Ravie Lakshmanan
The U.S. Cybersecurity and Infrastructure Security Agency (CISA), along with the Coast Guard Cyber Command (CGCYBER), on Thursday released a joint advisory warning of continued attempts on the part of threat actors to exploit the Log4Shell flaw in VMware Horizon servers to breach target networks. "Since December 2021, multiple threat actor groups have exploited Log4Shell on unpatched, public-facing VMware Horizon and [Unified Access Gateway] servers," the agencies  said . "As part of this exploitation, suspected APT actors implanted loader malware on compromised systems with embedded executables enabling remote command-and-control (C2)." In one instance, the adversary is said to have been able to move laterally inside the victim network, obtain access to a disaster recovery network, and collect and exfiltrate sensitive law enforcement data. Log4Shell , tracked as  CVE-2021-44228  (CVSS score: 10.0), is a remote code execution vulnerability affecting the Apache
Chinese Hackers Target VMware Horizon Servers with Log4Shell to Deploy Rootkit

Chinese Hackers Target VMware Horizon Servers with Log4Shell to Deploy Rootkit

April 01, 2022Ravie Lakshmanan
A Chinese advanced persistent threat tracked as Deep Panda has been observed exploiting the  Log4Shell vulnerability  in VMware Horizon servers to deploy a backdoor and a novel rootkit on infected machines with the goal of stealing sensitive data. "The nature of targeting was opportunistic insofar that multiple infections in several countries and various sectors occurred on the same dates,"  said  Rotem Sde-Or and Eliran Voronovitch, researchers with Fortinet's FortiGuard Labs, in a report released this week. "The victims belong to the financial, academic, cosmetics, and travel industries." Deep Panda , also known by the monikers Shell Crew, KungFu Kittens, and Bronze Firestone, is said to have been active since at least 2010, with recent attacks "targeting legal firms for data exfiltration and technology providers for command-and-control infrastructure building,"  according  to Secureworks. Cybersecurity firm CrowdStrike, which assigned the panda
Cynet Log4Shell Webinar: A Thorough - And Clear - Explanation

Cynet Log4Shell Webinar: A Thorough - And Clear - Explanation

February 04, 2022The Hacker News
Most security practitioners are now aware of the Log4Shell vulnerability discovered toward the end of 2021. No one knows how long the vulnerability existed before it was discovered. The past couple of months have had security teams scrambling to patch the Log4Shell vulnerability found in Apache Log4j, a Java library widely used to log error messages in applications. Beyond patching, it's helpful and instructive for security practitioners to have a deeper understanding of this most recent critical vulnerability. Fortunately, Cynet Senior Security Researcher Igor Lahav is hosting a webinar [ Register here ] to provide "buzzword free" insights into Log4Shell. Based on a webinar preview provided by Cynet, the discussion will cover the software bugs in Apache Log4j that permitted the critical vulnerability, the exploits used to take advantage of the vulnerabilities and the remediation options available to protect your organization. This webinar will help make sense of the so
Initial Access Broker Involved in Log4Shell Attacks Against VMware Horizon Servers

Initial Access Broker Involved in Log4Shell Attacks Against VMware Horizon Servers

January 26, 2022Ravie Lakshmanan
An initial access broker group tracked as Prophet Spider has been linked to a set of malicious activities that exploits the Log4Shell vulnerability in unpatched VMware Horizon Servers. According to new research published by BlackBerry Research & Intelligence and Incident Response (IR) teams today, the cybercrime actor has been opportunistically weaponizing the shortcoming to download a second-stage payload onto the victimized systems. The payloads observed include cryptocurrency miners, Cobalt Strike Beacons, and web shells, corroborating a previous advisory from the U.K. National Health Service (NHS) that  sounded the alarm  on active exploitation of the vulnerabilities in VMware Horizon servers to drop malicious web shells and establish persistence on affected networks for follow-on attacks. Log4Shell  is a moniker used to refer to an exploit affecting the popular Apache Log4j library that results in remote code execution by logging a specially crafted string. Since public
NHS Warns of Hackers Targeting Log4j Flaws in VMware Horizon

NHS Warns of Hackers Targeting Log4j Flaws in VMware Horizon

January 07, 2022Ravie Lakshmanan
The digital security team at the U.K. National Health Service (NHS) has raised the alarm on active exploitation of Log4Shell vulnerabilities in unpatched  VMware Horizon  servers by an unknown threat actor to drop malicious web shells and establish persistence on affected networks for follow-on attacks. "The attack likely consists of a reconnaissance phase, where the attacker uses the Java Naming and Directory InterfaceTM (JNDI) via Log4Shell payloads to call back to malicious infrastructure," the non-departmental public body  said  in an alert. "Once a weakness has been identified, the attack then uses the Lightweight Directory Access Protocol (LDAP) to retrieve and execute a malicious Java class file that injects a web shell into the VM Blast Secure Gateway service." The web shell, once deployed, can serve as a conduit to carry out a multitude of post-exploitation activities such as deploying additional malicious software, data exfiltration, or deployment of r
Log4Shell-like Critical RCE Flaw Discovered in H2 Database Console

Log4Shell-like Critical RCE Flaw Discovered in H2 Database Console

January 07, 2022Ravie Lakshmanan
Researchers have disclosed a security flaw affecting H2 database consoles that could result in remote code execution in a manner that echoes the Log4j "Log4Shell" vulnerability that came to light last month. The issue, tracked as  CVE-2021-42392 , is the "first critical issue published since Log4Shell, on a component other than Log4j, that exploits the same root cause of the Log4Shell vulnerability, namely JNDI remote class loading," JFrog researchers Andrey Polkovnychenko and Shachar Menashe  said . H2  is an open-source relational database management system written in Java that can be embedded within applications or run in a client-server mode. According to the  Maven Repository , the H2 database engine is used by 6,807 artifacts. JNDI, short for Java Naming and Directory Interface, refers to an API that provides naming and directory functionality for Java applications, which can use the API in conjunction with LDAP to locate a specific resource that it might
Apache Log4j Vulnerability — Log4Shell — Widely Under Active Attack

Apache Log4j Vulnerability — Log4Shell — Widely Under Active Attack

December 12, 2021Ravie Lakshmanan
Threat actors are actively weaponizing unpatched servers affected by the newly identified " Log4Shell " vulnerability in Log4j to install cryptocurrency miners, Cobalt Strike, and recruit the devices into a botnet, even as telemetry signs point to exploitation of the flaw nine days before it even came to light. Netlab, the networking security division of Chinese tech giant Qihoo 360,  disclosed  threats such as  Mirai  and  Muhstik  (aka Tsunami) are setting their sights on vulnerable systems to spread the infection and grow its computing power to orchestrate distributed denial-of-service (DDoS) attacks with the goal of overwhelming a target and rendering it unusable. Muhstik was previously spotted exploiting a critical security flaw in Atlassian Confluence ( CVE-2021-26084 , CVSS score: 9.8) earlier this September. The latest development comes as it has emerged that the vulnerability has been under attack for at least more than a week prior to its public disclosure on D
Extremely Critical Log4J Vulnerability Leaves Much of the Internet at Risk

Extremely Critical Log4J Vulnerability Leaves Much of the Internet at Risk

December 10, 2021Ravie Lakshmanan
The Apache Software Foundation has released fixes to contain an  actively   exploited  zero-day vulnerability affecting the widely-used Apache Log4j Java-based logging library that could be weaponized to execute malicious code and allow a complete takeover of vulnerable systems. Tracked as  CVE-2021-44228  and by the monikers Log4Shell or LogJam, the issue concerns a case of unauthenticated, remote code execution (RCE) on any application that uses the open-source utility and affects versions Log4j 2.0-beta9 up to 2.14.1. The bug has scored a perfect 10 on 10 in the CVSS rating system, indicative of the severity of the issue. "An attacker who can control log messages or log message parameters can execute arbitrary code loaded from  LDAP  servers when message lookup substitution is enabled," the Apache Foundation  said  in an advisory. "From Log4j 2.15.0, this behavior has been disabled by default." Exploitation can be achieved by a single string of text, which c
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