Ask the Experts

Ask the Experts

Enterprise network security

• Stateful vs. stateless firewalls: Understanding the differences

  Examine the important differences between stateful and stateless firewalls, and learn when each type of firewall should be used in an enterprise setting.  Continue Reading

• How to prevent network eavesdropping attacks

  One of the biggest challenges of network eavesdropping attacks is they are difficult to detect. Read about prevention measures to help keep your network safe from snoopers and sniffers.  Continue Reading

• Identifying and troubleshooting VPN session timeout issues

  Troubleshooting VPN session timeout and lockout issues should focus first on isolating where the root of the problem lies -- be it the internet connection, the VPN vendor or the user device.  Continue Reading

• Is VPN split tunneling worth the security risks?

  Enabling VPN split tunneling may increase speed and decrease bandwidth use and costs, but it also increases the number of security vulnerabilities faced.  Continue Reading

• Considering the differences in LAN vs. WAN security

  Given the differences in the security of LAN and WAN, enterprises need to guard against insider threats, secure against unauthorized access and potentially secure the edge, too.  Continue Reading

• Wired vs. wireless network security: Best practices

  Explore the differences between wired and wireless network security, and read up on best practices to ensure security with or without wires.  Continue Reading

• 7 TCP/IP vulnerabilities and how to prevent them

  While many TCP/IP security issues are in the protocol suite's implementation, there are some vulnerabilities in the underlying protocols to be aware of.  Continue Reading

• Host IDS vs. network IDS: Which is better?

  Compare host IDS vs. network IDS through the pros and cons of each, and learn how more modern systems may be better suited to ensure effective enterprise security.  Continue Reading

• Comparing inbound and outbound firewall rules for the enterprise

  Explore the differing roles of inbound versus outbound firewall rules for enterprise network security and the varying use cases for each.  Continue Reading

• How to prevent port scan attacks

  The popular port scan is a hacking tool that enables attackers to gather information about how corporate networks operate. Learn how to detect and prevent port scanning attacks.  Continue Reading

• The network security tools to combat modern threats

  Incorporating new network security tools and methods into your enterprise's infosec program may mean the difference between staying safe or falling victim to an attack.  Continue Reading

• What are the top network security techniques for modern companies?

  Protecting the enterprise network remains integral to overall IT security. Here are the top network security techniques enterprises are using to protect data.  Continue Reading

• Comparing Diffie-Hellman vs. RSA key exchange algorithms

  See which encryption method uses digital signatures, symmetric key exchanges, bulk encryption and much more in this Diffie-Hellman vs. RSA showdown.  Continue Reading

• Do network layer and application layer DDoS attacks differ?

  Network layer and application layer DDoS attacks are significant threats. Learn about the differences between them and what you can do to reduce their effects.  Continue Reading

• How to detect and defend against a TCP port 445 exploit and attacks

  The WannaCry TCP port 445 exploit returned the spotlight to Microsoft's long-abused networking port. Network security expert Kevin Beaver explains how to detect and defend against such attacks.  Continue Reading

• How can endpoint security features help combat modern threats?

  The antivirus of yesteryear isn't a strong enough competitor to beat modern enterprise threats. Learn about the endpoint security features ready to tackle these battles head-on.  Continue Reading

• What is a password spraying attack and how does it work?

  Password spraying isn't a sophisticated attack, but don't discount the attackers if you detect one. Find out how this brute-force technique works and how to defend against it.  Continue Reading

• What is a port scan attack?

  Cyberattacks often begin with a port scan attack, which attackers use to find exploitable vulnerabilities on targeted systems. Learn how they work and how to defend against them.  Continue Reading

• How can I detect fileless malware attacks?

  Monitoring process memory is one way to combat fileless malware attacks. Here's what you can do to protect your network against these campaigns.  Continue Reading

• Why do DDoS attack patterns rise in the autumn?

  DDoS attack patterns indicate a sharp escalation in the fall. Why does that occur and what can be done to guard against these attacks?  Continue Reading

• Should I worry about the Constrained Application Protocol?

  The Constrained Application Protocol underpins IoT networks. But the protocol could allow a threat actor to launch an attack.  Continue Reading

• Is a Mirai botnet variant targeting unpatched enterprises?

  New variants of popular botnets were found targeting IoT devices by Palo Alto Networks' Unit 42. Discover how these variants differ from their sources and what new risks they pose.  Continue Reading

• What new technique does the Osiris banking Trojan use?

  A new Kronos banking Trojan variant was found to use process impersonation to bypass defenses. Learn what this evasion technique is and the threat it poses with Nick Lewis.  Continue Reading

• How do I stop the Vidar malvertising attack?

  The Vidar malvertising attack was part of a two-pronged intrusion that included the installation of ransomware in endpoints. How can enterprises protect themselves?  Continue Reading

• How do trusted app stores release and disclose patches?

  A flaw was found in the Android installer for Fortnite and was patched within 24 hours. Learn how such a quick turnaround affects mobile app security with expert Nick Lewis.  Continue Reading

• How did Browser Reaper cause browsers to crash?

  A Mozilla vulnerability duplicated in the Browser Reaper set of DoS proofs of concept caused Chrome, Firefox and Safari to crash. Learn why and how this occurred.  Continue Reading

• Will DNS Flag Day affect you? Infoblox's Cricket Liu explains

  What is DNS Flag Day? That's when old and broken DNS servers will stop working, improving DNS performance and safety for all. Infoblox's chief DNS architect Cricket Liu explains.  Continue Reading

• Java deserialization attacks: What are they and how do they work?

  The TP-Link EAP Controller for Linux was recently found to be vulnerable to attacks. Learn from Judith Myerson what this means for users and how it can be prevented.  Continue Reading

• Ping of death: What is it and how is Apple affected?

  An Apple vulnerability recently resurfaced and is targeting Apple devices that are connected to public hotspots. Discover what this vulnerability is and how to protect your devices.  Continue Reading

• Network shaping: How does it enable BGP attacks to divert data

  The use of BGPsec protocols was found after looking into threat actors in China that controlled U.S. internet traffic. Discover how this technique works and how it can be mitigated.  Continue Reading

• Kronos banking Trojan: How does the new variant compare?

  Proofpoint researchers found a Kronos variant after it targeted victims in Germany, Japan and Poland. Learn how this variant compares to the original banking Trojan with Nick Lewis.  Continue Reading

• FragmentSmack: How is this denial-of-service exploited?

  FragmentSmack, a DDoS vulnerability first discovered in Linux, affects Windows as well as nearly 90 Cisco products. Discover how it can be exploited with Judith Myerson.  Continue Reading

• How does the resurgent VPNFilter botnet target victims?

  After a comeback of the Russian-built VPNFilter botnet, home network devices are at risk. Learn how this malware targets victims with expert Nick Lewis.  Continue Reading

• WPA3 protocol: Should enterprises implement the changes?

  The Wi-Fi Alliance released the updated WPA3 protocol, adding security enhancements to the Wi-Fi access process. Learn why enterprises should update with Judith Myerson.  Continue Reading

• What is VPNFilter malware and how can users protect themselves?

  A new threat named VPNFilter was discovered by cybersecurity researchers after home and office routers were compromised. Learn how this malware works with Judith Myerson.  Continue Reading

• How can attackers exploit a buffer underflow vulnerability?

  A buffer underflow was found to be caused by a vulnerability in strongSwan's open source VPN. Learn how this is possible and how attackers can exploit it with Judith Myerson.  Continue Reading

• What risks does the OpenFlow protocol vulnerability present?

  Researchers found a vulnerability in OpenFlow that can cause problems. Learn how vendor-specific SDN controllers may cause these OpenFlow protocol vulnerabilities.  Continue Reading

• My Cloud EX2: How can this device expose unauthorized data?

  SpiderLabs discovered My Cloud EX2 backup devices exposing unauthorized HTTP requests. Join Judith Myerson as she explains how this happens, as well as the impact on DLNA devices.  Continue Reading

• LG network: How can attackers use preauthenticated commands?

  A vulnerability was found in the LG network involving remote preauthenticated commands. Learn how researchers created a malicious password to show how it issue can be abused.  Continue Reading

• What is missing from the NIST/DHS botnet security report?

  The joint DHS and NIST report on botnet security offers goals and action items to counter distributed cyberthreats. Learn the report recommendations with expert Nick Lewis.  Continue Reading

• UPnP vulnerability: How is the UPnP protocol being misused?

  The UPnP protocol is being misused to distribute malware through home routers. Expert Michael Cobb explains the UPnP vulnerability and how to defend against it.  Continue Reading

• Bouncy Castle keystore: How are files vulnerable to brute force?

  BKS files are being exposed to hash collisions, enabling hackers to use brute force attacks against C# and Java applications. Learn how this occurs and possible solutions with Judith Myerson.  Continue Reading

• What are the implications of DNS over HTTPS for privacy?

  With enterprises testing DNS over HTTPS to encrypt domain name traffic, some fear the potential privacy issues. Discover the challenges and benefits of the new protocol.  Continue Reading

• How was a Cisco firewall vulnerability exploited by threat actors?

  Threat actors exploited a critical Cisco firewall vulnerability that received a CVSS score of 10. Discover how this flaw works and how it was exploited with Judith Myerson.  Continue Reading

• How will the new WPA3 protocol strengthen password security?

  The development of WPA3 helps advance Wi-Fi protocol, as the next generation of Wi-Fi-enabled devices begins to demand more. Expert Michael Cobb explains how it differs from WPA2.  Continue Reading

• IoT botnets: How are new Mirai variants impacting systems?

  An increase of IoT botnets has been seen since the Mirai malware source code was leaked. Learn how the new variants pose to be a serious threat to IoT devices with Michael Cobb.  Continue Reading

• What VPN alternatives should enterprises consider using?

  VPN vulnerabilities in products from popular vendors were recently found to enable serious threats. Discover how detrimental these threats are and best alternatives to the use of VPNs.  Continue Reading

• How are logic devices like WAGO PFC200 used by hackers?

  The Department of Homeland Security warned of a vulnerability affecting WAGO PFC200 logic devices. Discover how this flaw enables threat actors with expert Judith Myerson.  Continue Reading

• Single sign-on best practices: How can enterprises get SSO right?

  Proper planning is at the top of the list for single sign-on best practices, but it's important to get enterprise SSO implementations off to a good start. Here's how to do it.  Continue Reading

• How does the Devil's Ivy bug compromise security cameras?

  The Devil's Ivy bug affects millions of internet-connected security cameras. Expert Judith Myerson explains how the exploit works and what can be done to prevent it.  Continue Reading

• What can enterprises do to prevent an IoT botnet attack?

  An IoT botnet attack on Huawei home routers showed similarities to the Mirai malware. Expert Judith Myerson explains the threat and how enterprises can protect themselves.  Continue Reading

• Canvas fingerprinting: How does it compromise security?

  Mozilla recently decided to pull the HTML canvas element from the Firefox browser. Learn from expert Matt Pascucci what this means for the security and privacy of users.  Continue Reading

• How should enterprise firewall settings be reviewed?

  Getting firewall settings right is one of the most basic ways to protect enterprise data from accidental exposures. Expert Judith Myerson discusses how to review firewall policies.  Continue Reading

• How can a BGP vulnerability in Cisco products be fixed?

  A BGP vulnerability in some Cisco products enabled denial-of-service attacks. Expert Judith Myerson explains the vulnerability and how Cisco fixed the problem.  Continue Reading

• How can a vulnerability in Ruggedcom switches be mitigated?

  Vulnerabilities in Ruggedcom switches could open the industrial switches and other communication devices up to attacks. Expert Judith Myerson explains how to mitigate the risks.  Continue Reading

• LDAP injection: How was it exploited in a Joomla attack?

  After eight years, Joomla discovered an LDAP vulnerability that could be exploited by threat actors. Learn how the attack works from expert Matt Pascucci.  Continue Reading

• BlueBorne vulnerabilities: Are your Bluetooth devices safe?

  Armis Labs discovered a series of vulnerabilities that enables remote connection to Bluetooth devices. Learn more about the BlueBorne vulnerabilities with expert Matt Pascucci.  Continue Reading

• How can attacks like the Cherry Blossom project be prevented?

  With the WikiLeaks Cherry Blossom project, attackers can potentially inject malicious firmware into wireless routers. Expert Michael Cobb explains how to stop it from happening.  Continue Reading

• What QNAP vulnerabilities affect NAS storage device security?

  QNAP vulnerabilities in NAS enabled attackers to control devices. Expert Judith Myerson explains each of the QNAP NAS vulnerabilities and their fixes.  Continue Reading

• VMware AppDefense: How will it address endpoint security?

  VMware announced AppDefense, its latest effort to help improve endpoint security. Matt Pascucci explains how AppDefense addresses applications in vSphere environments.  Continue Reading

• How did a Windows Defender antivirus bug enable remote exploits?

  A vulnerability in Microsoft's Windows Defender antivirus tool left users open to remote code exploitation. Expert Nick Lewis explains how it happened, and what to do about it.  Continue Reading

• HP keylogger: How did it get there and how can it be removed?

  A keylogging flaw found its way into dozens of Hewlett Packard laptops. Nick Lewis explains how the HP keylogger works and what can be done about it.  Continue Reading

• How does an Amazon Echo vulnerability enable attackers to eavesdrop?

  Hackers could take advantage of a physical Amazon Echo vulnerability to turn the Echo into a listening device. Judith Myerson explains how this works and what can be done about it.  Continue Reading

• How can a DDoS reflection attack abuse CLDAP?

  A new exploit of CLDAP servers can be used for a DDoS reflection attack that gives attackers a 70x boost. Nick Lewis explains how to defend against this new threat.  Continue Reading

• PINLogger: How does this exploit steal PINs?

  The proof-of-concept PINLogger attack exploits mobile device sensors to steal PINs. Nick Lewis explains how the attack works and offers advice on how to stop it.  Continue Reading

• How does BrickerBot threaten enterprise IoT devices?

  BrickerBot is similar to other IoT malware like Mirai, Hajime and others. Expert Judith Myerson explains what makes BrickerBot different, and what can be done to defend against it.  Continue Reading

• How will IEEE 802.11ax prevent IoT security vulnerabilities?

  Router security vulnerabilities become a bigger problem as IoT devices become more widely used. The IEEE 802.11ax protocol could help, as expert Judith Myerson explains.  Continue Reading

• How do network management systems simplify security?

  Network security teams can find themselves overwhelmed with protecting an enterprise network. Expert Matthew Pascucci explains how network management systems can help with that.  Continue Reading

• How is cross-platform malware carried in Word docs?

  Cross-platform malware enables attackers to leverage their attacks using infected Microsoft Word docs. Expert Nick Lewis explains how the attacks work and how to defend against them.  Continue Reading

• ATMitch malware: Can fileless ATM malware be stopped?

  How was the ATMitch malware able to loot cash machines, then delete itself? Expert Nick Lewis explains how the fileless malware works and how it spreads.  Continue Reading

• Is upgrading to SNMP v3 enough to secure network devices?

  Using SNMP v3 is a good first step, but it's not enough to prevent attackers from accessing a network through an SNMP-enabled device. Expert Judith Myerson explains what else to do.  Continue Reading

• Libpurple flaw: How does it affect connected IM clients?

  The libpurple library contains a code execution vulnerability that affects the IM clients that were developed using it. Expert Michael Cobb explains how the flaw works.  Continue Reading

• Did DDoS attacks cause the FCC net neutrality site to go down?

  The FCC net neutrality comment site crashed, and it was blamed on DDoS attacks. Expert Matthew Pascucci looks at the technical side of this incident and what was behind it.  Continue Reading

• What tools were used to hide fileless malware in server memory?

  Fileless malware hidden in server memory led to attacks on many companies worldwide. Expert Nick Lewis explains how these attacks fit in with the wider fileless malware trend.  Continue Reading

• SQL Slammer worm returns: How risky is it for enterprises?

  The SQL Slammer worm has re-emerged to attack a vulnerability in Microsoft SQL Server 2000. Expert Nick Lewis explains what enterprises can do to manage out-of-date systems.  Continue Reading

• How does an Intel AMT flaw enable attackers to gain device access?

  A vulnerability in Intel AMT enables attackers to gain remote access to PCs and devices. Expert Judith Myerson explains how the attack works and what can be done to prevent it.  Continue Reading

• How did Webroot's antivirus signature update create false positives?

  A Webroot antivirus signature update flagged Windows and Windows applications as dangerous. Expert Matthew Pascucci explains how it happened and what Webroot did about it.  Continue Reading

• Fruitfly Mac malware: How does its decades-old code work?

  The Fruitfly Mac malware has decades-old code, but has been conducting surveillance attacks for over two years without detection. Expert Nick Lewis explains how it works.  Continue Reading

• Heartbleed vulnerability: Why does it persist on so many services?

  The Heartbleed flaw still impacts almost 200,000 services connected to the internet. Expert Nick Lewis explains why these services remain unpatched and vulnerable.  Continue Reading

• How do Linksys router vulnerabilities expose user data?

  Router vulnerabilities in over 20 Linksys models expose user data to attackers. Expert Judith Myerson explains how the flaws work and how to protect against them.  Continue Reading

• How can a NULL pointer dereference flaw create a DoS attack?

  A flaw in the open source graphics library libpng enabling denial-of-service attacks was discovered. Expert Michael Cobb explains how the vulnerability works.  Continue Reading

• How does the Stegano exploit kit use malvertising to spread?

  A malvertising campaign by the AdGholas group has been found spreading the Stegano exploit kit. Expert Nick Lewis explains how web advertisements are used in this attack.  Continue Reading

• How does Rakos malware attack embedded Linux systems?

  Rakos malware is attempting to build a botnet by attacking embedded Linux systems. Expert Nick Lewis explains how enterprises can prevent attacks on their systems.  Continue Reading

• Switcher Android Trojan: How does it attack wireless routers?

  The Switcher Trojan spreads to Android devices through the wireless router to which they are connected. Expert Nick Lewis explains how this attack is carried out.  Continue Reading

• Can BGP anycast addressing be used for DDoS attacks?

  The BGP anycast addressing technique could potentially be used for malicious purposes. Expert Judith Myerson explains how this might work and what types of attacks to look out for.  Continue Reading

• How can a smart TV security vulnerability be mitigated?

  A smart TV security vulnerability could potentially be exploited to steal the owner's data. Expert Judith Myerson explains how this works and offers tips on how to protect yourself.  Continue Reading

• How effective is geofencing technology as a security method?

  Geofencing technology is increasingly being used as a security tactic, such as to control access to servers with DNS settings. Expert Michael Cobb explains how it works.  Continue Reading

• How does IP hijacking work and how can it be prevented?

  IP hijacking incidents are on the rise because IP addresses can be easily targeted. Expert Judith Myerson explains how these attacks work and how they can be prevented.  Continue Reading

• How does Ticketbleed affect session ID security?

  The Ticketbleed bug in some F5 Networks products caused session IDs and uninitialized memory to leak. Expert Judith Myerson explains what a session ID is and how attackers use it.  Continue Reading

• How does the PoisonTap exploit bypass password locks on computers?

  The PoisonTap exploit can bypass password locks on computers, enabling an attacker to remotely control systems. Expert Nick Lewis explains how the attack works.  Continue Reading

• What basic steps can improve network device security in enterprises?

  Network device security is a big problem for enterprises, but there are some basic steps they can take to improve it. Expert Matthew Pascucci outlines the process.  Continue Reading

• How does BENIGNCERTAIN exploit Cisco PIX firewalls?

  The BENIGNCERTAIN exploit affects certain versions of Cisco systems using the IKEv1 protocol. Expert Nick Lewis explains what the protocol does and how the vulnerability works.  Continue Reading

• How does DNSChanger take advantage of WebRTC protocols?

  WebRTC protocols are being targeted by a new version of the DNSChanger exploit kit. Judith Myerson explains how these attacks work and what enterprises should know.  Continue Reading

• Are free VPN clients secure enough for enterprise users?

  There are many free VPN clients on the market, but are they secure enough for enterprise users? Expert Judith Myerson looks at the pros and cons of ad-supported VPNs.  Continue Reading

• Which encryption tools can secure data on IoT devices?

  Protecting the data that moves through the internet of things can be a challenge for enterprises. Expert Judith Myerson offers several encryption tools for the task.  Continue Reading

• How does a Netgear vulnerability enable command injection attacks?

  A Netgear vulnerability exposed a number of wireless router models to command injection attacks. Expert Judith Myerson explains how the attack works and how to stop it.  Continue Reading

• How can enterprises fix the NTP daemon vulnerability to DoS attacks?

  A recently patched NTP daemon vulnerability has put enterprises at risk. Expert Matthew Pascucci explains the vulnerability and how organizations can defend against it.  Continue Reading

• How does Microsoft's NetCease perform anti-network reconnaissance?

  Microsoft security researchers recently introduced a new tool called NetCease that prevents network reconnaissance. Expert Judith Myerson explains how the tool can stop attackers.  Continue Reading

• Do DMZ networks still provide security benefits for enterprises?

  DMZ networks were once widely used by enterprises, but are they still common today? Expert Judith Myerson explains why DMZs may be a good security option for some organizations.  Continue Reading

• How to prevent DoS attacks in the enterprise

  It's not possible to eradicate the risk of DoS attacks, but there are steps infosec pros can take to reduce their impact. Mike Chapple shares pointers on how to prevent DoS attacks.  Continue Reading