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    Home»Cyber Security»Barracuda Email Gateways Vulnerable Despite Recent Patches
    Cyber Security

    Barracuda Email Gateways Vulnerable Despite Recent Patches

    justmattgBy justmattgAugust 25, 2023No Comments2 Mins Read
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    Aug 25, 2023THNEmail Security / Vulnerability

    Barracuda Email Gateways

    The U.S. Federal Bureau of Investigation (FBI) is warning that Barracuda Networks Email Security Gateway (ESG) appliances patched against a recently disclosed critical flaw continue to be at risk of potential compromise from suspected Chinese hacking groups.

    It also deemed the fixes as “ineffective” and that it “continues to observe active intrusions and considers all affected Barracuda ESG appliances to be compromised and vulnerable to this exploit.”

    Tracked as CVE-2023-2868 (CVSS score: 9.8), the zero-day bug is said to have been weaponized as early as October 2022, more than seven months before the security hole was plugged. Google-owned Mandiant is tracking the China-nexus activity cluster under the name UNC4841.

    Cybersecurity

    The remote command injection vulnerability, impacting versions 5.1.3.001 through 9.2.0.006, allows for unauthorized execution of system commands with administrator privileges on the ESG product.

    In the attacks observed so far, a successful breach acts as a conduit to deploy multiple malware strains such as SALTWATER, SEASIDE, SEASPY, SANDBAR, SEASPRAY, SKIPJACK, WHIRLPOOL, and SUBMARINE (aka DEPTHCHARGE) that allow for the execution of arbitrary commands and defense evasion.

    Barracuda Email Gateways

    “The cyber actors utilized this vulnerability to insert malicious payloads onto the ESG appliance with a variety of capabilities that enabled persistent access, email scanning, credential harvesting, and data exfiltration,” the FBI said.

    The threat intelligence firm has characterized UNC4841 as both aggressive and skilled, demonstrating a flair for sophistication and quickly adapting their custom tooling to employ additional persistence mechanisms and maintain their foothold into high priority targets.

    The federal agency is recommending customers to isolate and replace all affected ESG devices with immediate effect, and scan the networks for suspicious outgoing traffic.

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