Sunday, June 16, 2024

Security Flaw Found In Symantec Firewalls

Datamation content and product recommendations are editorially independent. We may make money when you click on links to our partners. Learn More.

A number of Symantec firewalls, including popular Raptor models, have a security flaw that renders networks protected by the systems vulnerable to intrusion.

The flaw was disclosed to Symantec on July 3 by Ubizen, a security services provider that, ironically, soon after became a Symantec competitor. On July 17, Symantec announced it was acquiring Riptech, another security services provider.

Nonetheless, Ubizen worked with Symantec’s Security Response Team to resolve the issue, which centers on how Raptor firewalls generate Initial Sequence Numbers (ISNs), which are used to identify IP sessions.

Ubizen says the Symantec firewalls use an algorithm that generates ISNs that are not sufficiently random, making it possible to predict — within certain parameters — the next number in a sequence. With that information, a hacker can hijack the session and gain access to internal resources.

This type of vulnerability is far from new; Microsoft issued patches for the same vulnerability to its Windows NT 4.0 systems back in 1999. Ubizen found the flaw because it had a homegrown tool made to sample ISNs to ensure they are random enough to thwart an attempted break-in.

Ubizen worked with Symantec to come up with a patch for its firewalls. The patch is available at

Symantec firewalls affected by the flaw are:

  • Raptor Firewall 6.5 for Windows NT and 6.5.3 for Solaris
  • Symantec Enterprise Firewall 6.5.2 on Windows 2000 and NT; and version 7.0 on Solaris, Windows NT and NT
  • VelociRaptor Models 500, 700, 1000, 1100, 1200 and 1300
  • Symantec Gateway Security 5110, 5200 and 5300.
  • Subscribe to Data Insider

    Learn the latest news and best practices about data science, big data analytics, artificial intelligence, data security, and more.

    Similar articles

    Get the Free Newsletter!

    Subscribe to Data Insider for top news, trends & analysis

    Latest Articles