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Home arrow SecurityAlert Database

Arrow  Topic :

Predictable TCP ISN in Packeteer PacketShaper


Arrow  SecurityAlert : 2726
Arrow  CVE : CVE-2007-2782
Arrow  SecurityRisk : Low  Security Risk Low  (About)
Arrow  Remote Exploit : No
Arrow  Local Exploit : Yes
Arrow  Exploit Available : No
Arrow  Credit : nnposter
Arrow  Published : 25.05.2007

Arrow  Affected Software : Packeteer PacketShaper versions 7.3.0g2 and 7.5.0g1.



Arrow  Advisory Content :  

Predictable TCP ISN in Packeteer PacketShaper

Critical: Less critical
Impact: Connection spoofing, DoS
Where: Local network

Product: Packeteer PacketShaper
http://www.packetshaper.com/

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
http://www.cert.org/advisories/CA-1995-01.html

* RFC 1948
http://www.faqs.org/rfcs/rfc1948.html

The vulnerability has been identified in versions 7.3.0g2 and 7.5.0g1.
However, other versions may be also affected.

Solution:
Restrict network access to the device management interfaces

Found by:
nnposter




Arrow  Feedback :

If you have additional information or notice any errors regarding this security advisory, please use contact form or email us at info()securityreason()com.
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