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Thursday, February 8, 2024 * * * * * * * SECURITY BOULEVARD The Home of the Security Bloggers Network Community Chats Webinars Library * Home * Cybersecurity News * Features * Industry Spotlight * News Releases * Security Bloggers Network * Latest Posts * Syndicate Your Blog * Write for Security Boulevard * Webinars * Upcoming Webinars * Calendar View * On-Demand Webinars * Events * Upcoming Events * On-Demand Events * Sponsored Content * Chat * Security Boulevard Chat * Marketing InSecurity Podcast * Techstrong.tv Podcast * TechstrongTV - Twitch * Library * Related Sites * Techstrong Group * Cloud Native Now * DevOps.com * Security Boulevard * Techstrong Research * Techstrong TV * Techstrong.tv Podcast * Techstrong.tv - Twitch * Devops Chat * DevOps Dozen * DevOps TV * Media Kit * About * Sponsor * Analytics * AppSec * CISO * Cloud * DevOps * GRC * Identity * Incident Response * IoT / ICS * Threats / Breaches * More * Blockchain / Digital Currencies * Careers * Cyberlaw * Mobile * Social Engineering * Humor Hot Topics * Google Cybersecurity Action Team Threat Horizons Report #9 Is Out! * Midnight Blizzard and Cloudflare-Atlassian Cybersecurity Incidents * Product Highlight | Google Docs Phishing Scam Alert * USENIX Security ’23 - Hengkai Ye, Song Liu, Zhechang Zhang, and Hong Hu - VIPER: Spotting Syscall-Guard Variables for Data-Only Attacks * Google Pushes Software Security Via Rust, AI-Based Fuzzing * Google Cybersecurity Action Team Threat Horizons Report #9 Is Out! * Midnight Blizzard and Cloudflare-Atlassian Cybersecurity Incidents * Product Highlight | Google Docs Phishing Scam Alert * USENIX Security ’23 - Hengkai Ye, Song Liu, Zhechang Zhang, and Hong Hu - VIPER: Spotting Syscall-Guard Variables for Data-Only Attacks * Google Pushes Software Security Via Rust, AI-Based Fuzzing TwitterLinkedInFacebookRedditEmailShare Security Bloggers Network Home » Promo » Cybersecurity » Winter Vivern’s Roundcube Zero-Day Exploits WINTER VIVERN’S ROUNDCUBE ZERO-DAY EXPLOITS by Wajahat Raja on November 7, 2023 In a recent cybersecurity development, an elusive threat actor named Winter Vivern aimed its sights at the popular Roundcube webmail software, successfully exploiting a zero-day vulnerability on October 11th. This breach allowed unauthorized access to sensitive email messages, causing alarm in the online security community. This blog delves into the details of the Roundcube zero-day exploits, offering insights into Winter Vivern’s activities, the new vulnerability (CVE-2023-5631), their attack sequence, as well as the persistent threat they pose to European governments. UNVEILING ROUNDCUBE ZERO-DAY EXPLOITS Latest news on Roundcube exploits has revealed that Winter Vivern, identified as a Russian hacking group, has been active since 2020. Their nefarious operations primarily target governments in Central Asia and Europe. Known for launching phishing campaigns, employing customer PowerShell backdoors, and utilizing various malicious codes and documents, Winter Vivern has become a formidable adversary in the cyber realm. Interestingly, reports suggest a connection between Winter Vivern and MoustachedBouncer, a group based in Belarus. Recent months have witnessed an escalation in their attacks on Ukraine, Poland, and multiple government entities across Europe and India. Sponsorships Available WINTER VIVERN’S PAST ENCOUNTERS Zero-day exploits in Roundcube aren’t Winter Vivern’s first interaction with the webmail software. They previously exploited a different flaw, CVE-2020-35730, making them the second nation-state group, after APT28, to target this open-source platform. THE NEW VULNERABILITY: CVE-2023-5631 The latest Roundcube security issues hinged on a specific vulnerability known as CVE-2023-5631, which has a CVSS score of 5.4. This flaw allowed for stored cross-site scripting, enabling remote attackers to inject arbitrary JavaScript code into the software. Fortunately, a patch was swiftly released on October 14, 2023, to address this issue and enhance Roundcube’s security. WINTER VIVERN’S ATTACK SEQUENCE The attack orchestrated by Winter Vivern typically starts with a phishing message containing a Base64-encoded payload hidden within the HTML source code. Upon decoding, this payload launches a JavaScript injection from a remote server, exploiting the XSS vulnerability. ESET, a prominent cybersecurity research group, explained, “By sending a specially crafted email message, attackers are able to load arbitrary JavaScript code in the context of the Roundcube user’s browser window. No manual intervention other than viewing the message in a web browser is required” The second-stage JavaScript, known as checkupdate.js, acts as a loader, facilitating the execution of a final JavaScript payload. This payload allows the threat actor to extract email messages to a command-and-control (C2) server, thereby compromising sensitive data. ROUNDCUBE EMAIL VULNERABILITIES: A PERSISTENT THREAT Despite Winter Vivern’s use of relatively unsophisticated tools, they remain a significant threat to European governments. Their persistence in conducting phishing campaigns targeting vulnerable internet-facing applications, often left unpatched, creates ample opportunities for exploitation. As the security landscape continues to evolve, vigilance and timely updates are essential to mitigate the risks posed by threat actors like Winter Vivern. CONCLUSION The Winter Vivern attack on Roundcube’s zero-day flaw serves as a stark reminder of the ever-present cybersecurity challenges that organizations face today. It underscores the importance of proactive security measures, timely patching, and continuous vigilance in preventing Roundcube zero-day attacks. As the digital world advances, so do the capabilities of cybercriminals, making it crucial for businesses and governments to stay one step ahead in the ongoing battle for online security. The sources for this piece include articles in The Hacker News and Tech Times. The post Winter Vivern’s Roundcube Zero-Day Exploits appeared first on TuxCare. *** This is a Security Bloggers Network syndicated blog from TuxCare authored by Wajahat Raja. Read the original post at: https://tuxcare.com/blog/winter-viverns-roundcube-zero-day-exploits/ November 7, 2023November 7, 2023 Wajahat Raja Cybersecurity, Cybersecurity News, European Governments, Roundcube, threat actor, Vulnerability (CVE-2023-5631), Winter Vivern, zero-day exploits * ← Introducing Bulk Remediation for Software Composition Analysis (SCA) * ISO 27001 Requirements: Everything You Need to Get Certified → TECHSTRONG TV – LIVE Click full-screen to enable volume control Watch latest episodes and shows UPCOMING WEBINARS 1. 2. 3. 4. 5. 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