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Encrypted messaging app Signal has pushed back against "viral reports" of an alleged zero-day flaw in its software, stating it found no evidence to support the claim. "After responsible investigation *we have no evidence that suggests this vulnerability is real* nor has any additional info been shared via our official reporting channels," it  said  in a series of messages posted in X (formerly Twitter). Signal said it also checked with the U.S. government and that it found no information to suggest "this is a valid claim." It's also urging those with legitimate information to send reports to security@signal[.]org. The development comes as  reports   circulated  over the  weekend  about a zero-day vulnerability in Signal that could be exploited to gain complete access to a targeted mobile device. As a security precaution, it's been advised to turn off  link previews  in the app. The feature can be disabled by going to Signal Settings > Chats

Software services provider Ivanti is  warning  of a new critical zero-day flaw impacting Ivanti Sentry (formerly MobileIron Sentry) that it said is being actively exploited in the wild, marking an escalation of its security woes. Tracked as  CVE-2023-38035  (CVSS score: 9.8), the issue has been described as a case of authentication bypass impacting versions 9.18 and prior due to what it called an due to an insufficiently restrictive Apache HTTPD configuration. "If exploited, this vulnerability enables an unauthenticated actor to access some sensitive APIs that are used to configure the Ivanti Sentry on the administrator portal (port 8443, commonly MICS)," the company  said . "While the issue has a high CVSS score, there is a low risk of exploitation for customers who do not expose port 8443 to the internet." Successful exploitation of the bug could allow an attacker to change configuration, run system commands, or write files onto the system. It's recommen

A sophisticated Facebook phishing campaign has been observed exploiting a zero-day flaw in Salesforce's email services, allowing threat actors to craft targeted phishing messages using the company's domain and infrastructure. "Those phishing campaigns cleverly evade conventional detection methods by chaining the Salesforce vulnerability and legacy quirks in Facebook's Web Games platform," Guardio Labs researchers Oleg Zaytsev and Nati Tal  said  in a report shared with The Hacker News. The email messages masquerade as coming from Meta, while being sent from an email address with a "@salesforce.com" domain. They seek to trick recipients into clicking on a link by claiming that their Facebook accounts are undergoing a "comprehensive investigation" due to "suspicions of engaging in impersonation." The goal is to direct users to a rogue landing page that's designed to capture the victim's account credentials and two-factor aut

Apple has  rolled out security updates  to iOS, iPadOS, macOS, tvOS, watchOS, and Safari to address several security vulnerabilities, including one actively exploited zero-day bug in the wild. Tracked as  CVE-2023-38606 , the shortcoming resides in the kernel and permits a malicious app to modify sensitive kernel state potentially. The company said it was addressed with improved state management. "Apple is aware of a report that this issue may have been actively exploited against versions of iOS released before iOS 15.7.1," the tech giant noted in its advisory. It's worth noting that CVE-2023-38606 is the fourth security vulnerability discovered in connection with  Operation Triangulation , a sophisticated mobile cyber espionage campaign targeting iOS devices since 2019 using a zero-click exploit chain. The other two zero-days,  CVE-2023-32434 and CVE-2023-32435 , were patched by Apple last month. A third shortcoming, CVE-2022-46690 , was addressed as part of securi

Zimbra has warned of a critical zero-day security flaw in its email software that has come under active exploitation in the wild. "A security vulnerability in Zimbra Collaboration Suite Version 8.8.15 that could potentially impact the confidentiality and integrity of your data has surfaced," the company  said  in an advisory. It also said that the issue has been addressed and that it's expected to be delivered in the July patch release. Additional specifics about the flaw are currently unavailable, although Zimbra said it fixed the issue through input sanitization. In the interim, it is urging customers to  apply a manual fix  to eliminate the attack vector - Take a backup of the file /opt/zimbra/jetty/webapps/zimbra/m/momoveto Edit this file and go to line number 40 Update the parameter value as: <input name="st" type="hidden" value="${fn:escapeXml(param.st)}"/> Before the update, the line appeared as: <input name="st

The Chinese state-sponsored group known as  UNC3886  has been found to exploit a zero-day flaw in VMware ESXi hosts to backdoor Windows and Linux systems. The VMware Tools authentication bypass vulnerability, tracked as  CVE-2023-20867  (CVSS score: 3.9), "enabled the execution of privileged commands across Windows, Linux, and PhotonOS (vCenter) guest VMs without authentication of guest credentials from a compromised ESXi host and no default logging on guest VMs," Mandiant  said . UNC3886 was  initially documented  by the Google-owned threat intelligence firm in September 2022 as a cyber espionage actor infecting VMware ESXi and vCenter servers with backdoors named VIRTUALPITA and VIRTUALPIE. Earlier this March, the group was  linked  to the exploitation of a now-patched medium-severity security flaw in the Fortinet FortiOS operating system to deploy implants on the network appliances and interact with the aforementioned malware. The threat actor has been described as a

Details have emerged about a now-patched actively exploited security flaw in Microsoft Windows that could be abused by a threat actor to gain elevated privileges on affected systems. The vulnerability, tracked as  CVE-2023-29336 , is rated 7.8 for severity and concerns an elevation of privilege bug in the Win32k component. "An attacker who successfully exploited this vulnerability could gain SYSTEM privileges," Microsoft  disclosed  in an advisory issued last month as part of Patch Tuesday updates. Avast researchers Jan Vojtěšek, Milánek, and Luigino Camastra were credited with discovering and reporting the flaw. Win32k.sys is a kernel-mode driver and an integral part of the Windows architecture, being responsible for graphical device interface (GUI) and window management. While the exact specifics surrounding in-the-wild abuse of the flaw is presently not known, Numen Cyber has deconstructed the patch released by Microsoft to craft a proof-of-concept ( PoC ) exploit

A critical flaw in Progress Software's in MOVEit Transfer managed file transfer application has come under widespread exploitation in the wild to take over vulnerable systems. The shortcoming, which is assigned the CVE identifier CVE-2023-34362 , relates to a severe SQL injection vulnerability that could lead to escalated privileges and potential unauthorized access to the environment. "An SQL injection vulnerability has been found in the MOVEit Transfer web application that could allow an unauthenticated attacker to gain unauthorized access to MOVEit Transfer's database," the company  said . "Depending on the database engine being used (MySQL, Microsoft SQL Server, or Azure SQL), an attacker may be able to infer information about the structure and contents of the database in addition to executing SQL statements that alter or delete database elements." Patches for the bug have been made available by the Massachusetts-based company, which also owns Teler

Print management software provider PaperCut said that it has "evidence to suggest that unpatched servers are being exploited in the wild," citing two vulnerability reports from cybersecurity company Trend Micro. "PaperCut has conducted analysis on all customer reports, and the earliest signature of suspicious activity on a customer server potentially linked to this vulnerability is 14th April 01:29 AEST / 13th April 15:29 UTC," it further  added . The update comes as the U.S. Cybersecurity and Infrastructure Security Agency (CISA) added a critical improper access control flaw ( CVE-2023-27350 , CVSS score: 9.8) in PaperCut MF and NG to the Known Exploited Vulnerabilities (KEV) catalog, based on evidence of active exploitation. Cybersecurity company Huntress, which found about 1,800 publicly exposed PaperCut servers, said it observed PowerShell commands being spawned from PaperCut software to install remote management and maintenance (RMM) software like Atera an

Google on Friday released out-of-band updates to resolve an actively exploited zero-day flaw in its Chrome web browser, making it the first such bug to be addressed since the start of the year. Tracked as  CVE-2023-2033 , the high-severity vulnerability has been described as a  type confusion issue  in the V8 JavaScript engine. Clement Lecigne of Google's Threat Analysis Group (TAG) has been credited with reporting the issue on April 11, 2023. "Type confusion in V8 in Google Chrome prior to 112.0.5615.121 allowed a remote attacker to potentially exploit heap corruption via a crafted HTML page,"  according  to the NIST's National Vulnerability Database (NVD). The tech giant  acknowledged  that "an exploit for CVE-2023-2033 exists in the wild," but stopped short of sharing additional technical specifics or indicators of compromise (IoCs) to prevent further exploitation by threat actors. CVE-2023-2033 also appears to share similarities with  CVE-2022-1096

Threat actors using hacking tools from an Israeli surveillanceware vendor named QuaDream targeted at least five members of civil society in North America, Central Asia, Southeast Asia, Europe, and the Middle East. According to findings from a group of researchers from the Citizen Lab, the spyware campaign was directed against journalists, political opposition figures, and an NGO worker in 2021. The names of the victims were not disclosed. It's also suspected that the company abused a zero-click exploit dubbed  ENDOFDAYS  in iOS 14 to deploy spyware as a zero-day in version 14.4 and 14.4.2. There is no evidence that the exploit has been used after November 2021. ENDOFDAYS "appears to make use of invisible iCloud calendar invitations sent from the spyware's operator to victims," the researchers said , adding the .ics files contain invites to two backdated and overlapping events so as to not alert the users.  The attacks are suspected to have leveraged a quirk in iO

Apple on Friday released security updates for  iOS, iPadOS ,  macOS , and  Safari web browser  to address a pair of zero-day flaws that are being exploited in the wild. The two vulnerabilities are as follows - CVE-2023-28205  - A  use after free issue  in WebKit that could lead to arbitrary code execution when processing specially crafted web content. CVE-2023-28206  - An  out-of-bounds write issue  in IOSurfaceAccelerator that could enable an app to execute arbitrary code with kernel privileges. Apple said it addressed CVE-2023-28205 with improved memory management and the second with better input validation, adding it's aware the bugs "may have been actively exploited." Credited with discovering and reporting the flaws are Clément Lecigne of Google's Threat Analysis Group (TAG) and Donncha Ó Cearbhaill of Amnesty International's Security Lab. Details about the two vulnerabilities have been withheld in light of active exploitation and to prevent more

As many as 55 zero-day vulnerabilities were exploited in the wild in 2022, with most of the flaws discovered in software from Microsoft, Google, and Apple. While this figure represents a decrease from the year before, when a staggering 81 zero-days were weaponized, it still represents a significant uptick in recent years of threat actors leveraging unknown security flaws to their advantage. The  findings  come from threat intelligence firm Mandiant, which noted that desktop operating systems (19), web browsers (11), IT and network management products (10), and mobile operating systems (six) accounted for the most exploited product types. Of the 55 zero-day bugs, 13 are estimated to have been abused by cyber espionage groups, with four others exploited by financially motivated threat actors for ransomware-related operations. Commercial spyware vendors were linked to the exploitation of three zero-days. Among state-sponsored groups, those attributed to China have emerged as the most

Microsoft on Tuesday released  security updates  to address 75 flaws spanning its product portfolio, three of which have come under active exploitation in the wild. The updates are in addition to 22 flaws the Windows maker  patched  in its Chromium-based Edge browser over the past month. Of the 75 vulnerabilities, nine are rated Critical and 66 are rated Important in severity. 37 out of 75 bugs are classified as remote code execution (RCE) flaws. The three zero-days of note that have been exploited are as follows - CVE-2023-21715  (CVSS score: 7.3) - Microsoft Office Security Feature Bypass Vulnerability CVE-2023-21823  (CVSS score: 7.8) - Windows Graphics Component Elevation of Privilege Vulnerability CVE-2023-23376  (CVSS score: 7.8) - Windows Common Log File System (CLFS) Driver Elevation of Privilege Vulnerability "The attack itself is carried out locally by a user with authentication to the targeted system," Microsoft said in advisory for CVE-2023-21715. "

Apple on Monday rolled out security updates for  iOS, iPadOS ,  macOS , and  Safari  to address a zero-day flaw that it said has been actively exploited in the wild. Tracked as  CVE-2023-23529 , the issue relates to a type confusion bug in the WebKit browser engine that could be activated when processing maliciously crafted web content, culminating in arbitrary code execution. The iPhone maker said the bug was addressed with improved checks, adding it's "aware of a report that this issue may have been actively exploited." An anonymous researcher has been credited with reporting the flaw. It's not immediately clear as to how the vulnerability is being exploited in real-world attacks, but it's the second actively abused type confusion flaw in WebKit to be patched by Apple after  CVE-2022-42856  in as many months, which was closed in December 2022.  WebKit flaws are also notable for the fact that they impact every third-party web browser that's available fo

An unknown threat actor created malicious game modes for the Dota 2 multiplayer online battle arena (MOBA) video game that could have been exploited to establish backdoor access to players' systems. The modes exploited a  high-severity flaw  in the V8 JavaScript engine tracked as  CVE-2021-38003  (CVSS score: 8.8), which was  exploited as a zero-day  and addressed by Google in October 2021. "Since V8 was not sandboxed in Dota, the exploit on its own allowed for remote code execution against other Dota players," Avast researcher Jan Vojtěšek  said  in a report published last week. Following responsible disclosure to Valve, the game publisher  shipped fixes  on January 12, 2023, by upgrading the version of V8. Game modes are essentially  custom capabilities  that can either augment an existing title or offer completely new gameplay in a manner that deviates from the standard rules. While publishing a custom game mode to the Steam store includes a vetting process from

A zero-day flaw in a WordPress plugin called  BackupBuddy  is being actively exploited, WordPress security company Wordfence has disclosed. "This vulnerability makes it possible for unauthenticated users to download arbitrary files from the affected site which can include sensitive information," it  said . BackupBuddy allows users to back up their entire WordPress installation from within the dashboard, including theme files, pages, posts, widgets, users, and media files, among others. The plugin is estimated to have around 140,000 active installations, with the flaw (CVE-2022-31474, CVSS score: 7.5) affecting versions 8.5.8.0 to 8.7.4.1. It's been addressed in version 8.7.5 released on September 2, 2022. The issue is rooted in the function called "Local Directory Copy" that's designed to store a local copy of the backups. According to Wordfence, the vulnerability is the result of an insecure implementation, which enables an unauthenticated threat acto

Google on Monday shipped security updates to address a high-severity zero-day vulnerability in its Chrome web browser that it said is being exploited in the wild. The shortcoming, tracked as  CVE-2022-2294 , relates to a heap overflow flaw in the  WebRTC  component that provides real-time audio and video communication capabilities in browsers without the need to install plugins or download native apps. Heap buffer overflows, also referred to as heap overrun or heap smashing, occur when data is overwritten in the  heap area of the memory , leading to arbitrary code execution or a denial-of-service (DoS) condition. "Heap-based overflows can be used to overwrite function pointers that may be living in memory, pointing it to the attacker's code," MITRE  explains . "When the consequence is arbitrary code execution, this can often be used to subvert any other security service." Credited with reporting the flaw on July 1, 2022, is Jan Vojtesek from the Avast Thre

A suspected ransomware intrusion attempt against an unnamed target leveraged a Mitel VoIP appliance as an entry point to achieve remote code execution and gain initial access to the environment. The  findings  come from cybersecurity firm CrowdStrike, which traced the source of the attack to a Linux-based Mitel VoIP device sitting on the network perimeter, while also identifying a previously unknown exploit as well as a couple of anti-forensic measures adopted by the actor on the device to erase traces of their actions. The zero-day exploit in question is tracked as CVE-2022-29499 and was fixed by Mitel in April 2022 by means of a remediation script that it shared with customers. It's rated 9.8 out of 10 for severity on the CVSS vulnerability scoring system, making it a critical shortcoming. "A vulnerability has been identified in the Mitel Service Appliance component of MiVoice Connect (Mitel Service Appliances – SA 100, SA 400, and Virtual SA) which could allow a malic