[NEWS] Packeteer PacketShaper Predictable TCP ISN

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Packeteer PacketShaper Predictable TCP ISN
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SUMMARY

Packeteer PacketShaper has been found to be vulnerable to a vulnerability
that allows remote attackers to predict the next ISN number that will be
given by the TCP stack.

DETAILS

Vulnerable Systems:
* Packeteer PacketShaper versions 7.3.0g2 and 7.5.0g1

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.


ADDITIONAL INFORMATION

The information has been provided by <mailto:nnposter@xxxxxxxxxxxxx>
nnposter.



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