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Trend Micro Patches Vulnerabilities in InterScan Messaging Security Product

Trend Micro has patched several vulnerabilities in its InterScan Messaging Security product, including flaws that could have a serious impact.

InterScan Messaging Security is an email and collaboration security product designed to provide protection against spam, phishing and sophisticated attacks. The product has a hybrid SaaS deployment option that combines a gateway virtual appliance with a prefilter to block spam and threats.

Researchers at cybersecurity consultancy SEC Consult discovered that the InterScan Messaging Security Virtual Appliance (IMSVA) is affected by eight types of security issues.

The list includes cross-site request forgery (CSRF), XML external entity (XXE), over-privileged users and services, server-side request forgery (SSRF), local file disclosure, information disclosure, weak password storage, and outdated software components.

One of the most serious vulnerabilities is CVE-2020-27016, a high-severity CSRF issue that can be exploited to modify the product’s policy rules, which, according to SEC Consult, can allow an attacker to bypass malware checks or forward emails to a host they control.

However, in order to exploit this flaw, an attacker needs to convince an authenticated administrator to access a malicious webpage.

SEC Consult also discovered a high-severity XXE vulnerability, tracked as CVE-2020-27017, that can be exploited to read arbitrary local files. While exploitation requires admin privileges, an attacker could achieve this by combining it with the CSRF flaw.

The remaining security holes have been rated medium or low severity. One of them can allow an attacker to access files that should only be accessible to users with high privileges. This weakness can be combined with the XXE flaw to access files that are normally only accessible to the root user, such as /etc/shadow, which contains user account information. The other less severe issues could expose sensitive information.

“Some vulnerabilities need administrative access rights or an administrator actively being logged in (such as for CSRF). A standard user account is sufficient in order to exploit the SSRF/file disclosure vulnerability. The information disclosure vulnerability can be exploited without prior authentication and potentially sensitive data such as key material can be obtained,” SEC Consult told SecurityWeek.

SEC Consult said it informed Trend Micro about the vulnerabilities in late April and patches were released on October 9. However, Trend Micro only issued a security bulletin on November 4.

“We are aware of the vulnerabilities found in the IMSVA product and commend SEC Consult for responsibly disclosing them and working closely with us. We have released a critical patch that resolves these vulnerabilities and encourage customers to ensure that their products have been updated to the latest build,” Trend Micro told SecurityWeek in an emailed statement.

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Eduard Kovacs (@EduardKovacs) is a contributing editor at SecurityWeek. He worked as a high school IT teacher for two years before starting a career in journalism as Softpedia’s security news reporter. Eduard holds a bachelor’s degree in industrial informatics and a master’s degree in computer techniques applied in electrical engineering.