Predictable TCP ISN in Packeteer PacketShaper
Critical: Less critical
Impact: Connection spoofing, DoS
Where: Local network
Product: Packeteer PacketShaper
Description: The TCP/IP stack of Packeteer PacketShaper is generating predictable initial sequence numbers (ISN): The sequence number is incremented by 128000 per second and by 64000 per connection. (As an example, if the current SYN/ACK ISN is 319104000 then about six seconds later the ISN is likely to be 319936000.) This allows an attacker to spoof connections from trusted clients or launch a DoS attack.
This type of vulnerability has been described over ten years ago in:
* CERT Advisory CA-1995-01
* RFC 1948
The vulnerability has been identified in versions 7.3.0g2 and 7.5.0g1. However, other versions may be also affected.
Restrict network access to the device management interfaces