Bug 4511 - IPChains Security Hole
IPChains Security Hole
Status: CLOSED CURRENTRELEASE
Product: Red Hat Linux
Classification: Retired
Component: kernel (Show other bugs)
6.0
All Linux
high Severity medium
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Assigned To: Cristian Gafton
: Security
Depends On:
Blocks:
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Reported: 1999-08-13 10:41 EDT by pjmattal
Modified: 2008-08-01 12:22 EDT (History)
0 users

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Doc Type: Bug Fix
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Description pjmattal 1999-08-13 10:41:59 EDT
There is a recent security hole in the ipchains IP
forwarding mechanism that can allow arbitrary packets
through the ipchains filters if a fragment overlap tactic is
used to rewrite the address in the header. A "fragrouter"
exploit has been written which makes it particularly easy
for hackers to exploit this hole.

The patch has been incorporated into the Linux 2.2.11 kernel
as blessed/released by Linus on August 9, 1999. This kernel
(or, marginally, a patched version of the 2.2.5 kernel)
should be packaged and released ASAP!

For more information, visit:

http://www.securityfocus.com/vdb/bottom.html?vid=543

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