A denial of service (DoS) attack is a type of attack whereby the perpetrator attempts to make a particular machine or network resource unavailable to its intended users by temporarily or indefinitely disrupting services of a specific host within a network. DoS attacks can occur when a system becomes flooded with specific network requests or subversive operations that can cause the resourced system to become unresponsive.
Symantec Endpoint Encryption can be susceptible to a null pointer de-reference issue, which can result in a NullPointerException that can lead to a privilege escalation scenario. A null-pointer dereference takes place when a pointer with a value of NULL is used as though it pointed to a valid memory area.
These issues were validated by the product team engineers. A Symantec Endpoint Encryption update, version SEE v11.1.3MP1, has been released which addresses the aforementioned issues. Note that the latest releases and patches for Symantec Endpoint Encryption are available to customers through normal support channels. 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 for 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.
Kyriakos Economou (@kyREcon) on behalf of Nettitude: https://www.nettitude.com/ (CVE-2017-15525)
Kyriakos Economou (@kyREcon) on behalf of Nettitude: https://www.nettitude.com/ (CVE-2017-15526)
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