Title: NetScreen ScreenOS Predictable Initial TCP Sequence Number Vulnerability
Severity: HIGH
Description:
NetScreen is a line of Internet security appliances integrating firewall, VPN and traffic management features. ScreenOS is the software used to manage and configure the firewall. NetScreen supports Microsoft Windows 95, 98, ME, NT and 2000 clients.
NetScreen has discovered a vulnerability in the algorithms used by ScreenOS to generate initial TCP sequence numbers. The ability to predict TCP sequence numbers may allow a remote attacker to inject packets into a vulnerable data stream.
It may also be possible for an attacker to launch man-in-the-middle attacks or hijack network sessions which would allow her to bypass any necessary authentication procedures.
For this issue to be exploitable the attacker must be able to access to network session traffic, possibily requiring access to a local network.
Affected Products:
- NetScreen ScreenOS 1.7.0
- NetScreen ScreenOS 2.6.0
- NetScreen ScreenOS 2.8.0
- NetScreen ScreenOS 3.0.0
- NetScreen ScreenOS 3.1.0
- NetScreen ScreenOS 4.0.0
References:
- NetScreen: NetScreen Homepage
- Netscreen: NetScreen Security Alert 51897
Juniper Networks provides this content via a wide variety of sources and production methods. If notified of errors or omissions in the content of this page, Juniper Networks, at its discretion, will modify or remove the page or leave the content as is, depending on various factors including but not limited to the reputation and authority of the party providing the notification. Please use the contact information displayed elsewhere on this page to report any errors or omissions regarding the content on this page.
