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Category:   OS (Linux)  >   Linux Kernel Vendors:   kernel.org
Linux Kernel Weakness in Sequence Number Generation Facilitates Packet Injection Attacks
SecurityTracker Alert ID:  1025977
SecurityTracker URL:  http://securitytracker.com/id/1025977
CVE Reference:   CVE-2011-3188   (Links to External Site)
Date:  Aug 25 2011
Impact:   Host/resource access via network
Fix Available:  Yes  Vendor Confirmed:  Yes  

Description:   A vulnerability was reported in the Linux Kernel. A remote user can conduct packet injection attacks.

The kernel's sequence number generation function uses partial MD4 with 24-bits unguessable. A remote user may be able to brute-force guess a valid sequence number to inject a packet into a session.

Dan Kaminsky reported this vulnerability.

Impact:   A remote user can conduct packet injection attacks.
Solution:   The vendor has issued a fix, available at:

http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=6e5714eaf77d79ae1c8b47e3e040ff5411b717ec

http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=bc0b96b54a21246e377122d54569eef71cec535f

Vendor URL:  www.kernel.org/ (Links to External Site)
Cause:   Randomization error

Message History:   This archive entry has one or more follow-up message(s) listed below.
Nov 1 2011 (Red Hat Issues Fix) Linux Kernel Weakness in Sequence Number Generation Facilitates Packet Injection Attacks
Red Hat has issued a fix for Red Hat Enterprise Linux 5.6.
Nov 22 2011 (Red Hat Issues Fix) Linux Kernel Weakness in Sequence Number Generation Facilitates Packet Injection Attacks
Red Hat has issued a fix for Red Hat Enterprise Linux 6.



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