The Symantec Messaging Gateway can encounter an issue of remote code execution, which describes a situation whereby an individual may obtain the ability to execute commands remotely on a target machine or in a target process.
The Symantec Messaging Gateway, when processing a specific email attachment, can allow a malformed or corrupted Word file with a potentially malicious macro through despite the administrator having the ‘disarm’ functionality enabled. This constitutes a ‘bypass’ of the disarm functionality resident to the application.
The Symantec Messaging Gateway can encounter a file inclusion vulnerability, which is a type of vulnerability that is most commonly found to affect web applications that rely on a scripting run time. This issue is caused when an application builds a path to executable code using an attacker-controlled variable in a way that allows the attacker to control which file is executed at run time.
This file inclusion vulnerability subverts how an application loads code for execution. Successful exploitation of a file inclusion vulnerability will result in remote code execution on the web server that runs the affected web application.
These issues were validated by the product team engineers. A Symantec Messaging Gateway update, version 10.6.3 with patch 10.6.3-266, has been released which addresses the aforementioned vulnerabilities. Please ensure you upgrade to the new version and apply the necessary patch. Note that the Symantec Messaging Gateway’s latest release is available to customers through normal support channels. For details on the patching process for Symantec Messaging Gateway, you can reference the following knowledge base article: http://www.symantec.com/docs/TECH246802
At this time, Symantec is not aware of any exploitations or adverse customer impact from these issues.
Symantec recommends the following measures to reduce risk of attack:
Restrict access to administrative or management systems to authorized privileged users.
Restrict remote access to trusted/authorized systems only.
Run under the principle of least privilege, where possible, to limit the impact of potential exploit.
Keep all operating systems and applications current with vendor patches.
Follow a multi-layered approach to security. At a minimum, run both firewall and anti-malware applications to provide multiple points of detection and protection to both inbound and outbound threats.
Deploy network and host-based intrusion detection systems to monitor network traffic for signs of anomalous or suspicious activity. This may aid in the detection of attacks or malicious activity related to the exploitation of latent vulnerabilities.
Adam Witt: firstname.lastname@example.org (CVE-2017-6324)
Mehmet Dursun Ince: email@example.com (CVE-2017-6325, CVE-2017-6326)
Added link to KB on patch process
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