Bug 147468

Summary:	CAN-2005-0449 Possible remote Oops/firewall bypass - kABI breaker
Product:	Red Hat Enterprise Linux 4	Reporter:	Mark J. Cox <mjc>
Component:	kernel	Assignee:	David Miller <davem>
Status:	CLOSED ERRATA	QA Contact:	Brian Brock <bbrock>
Severity:	medium	Docs Contact:
Priority:	medium
Version:	4.0	CC:	davej, jbaron, peterm, riel, tburke
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2005-04-19 18:52:22 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:
Bug Blocks:	139847

Description Mark J. Cox 2005-02-08 11:38:11 UTC

vendor-sec made us aware of a security relevant problem yesterday (remote
opps/firewall bypass) in the netdev code. 

  http://linux.bkbits.net:8080/linux-2.5/cset@41f8843a8ZMCNuP3meYAYnnXd3CO_g

This is the relevant thread:

  http://oss.sgi.com/archives/netdev/2005-01/msg01036.html

Passed to PeterM for investigation, the patch breaks kABI.

Comment 1 Mark J. Cox 2005-02-17 09:19:19 UTC

Making public, has gained vendor fixes and CVE name.

Comment 2 Mark J. Cox 2005-02-23 09:50:15 UTC

Note that this issue is only exploitable on SMP

Comment 3 Mark J. Cox 2005-02-24 10:39:07 UTC

There are two issues, which got confused into one in another vendors
advisory hence why there is currently one RH bug which references the
discussion for one with the fix for the other.

The first allows you to crash a host remotely using bad fragments but
that only affects certain NICs.  This requires a separate bug (opening
soon) not a kabi breaker:
http://linux.bkbits.net:8080/linux-2.6/cset@41f59581p1swNaow4K1aBglV-q2jf

But we're also tracking as a second issue a possible bypass/crash of
firewall rules on SMP.  If a new head fragment arrives on another CPU
through PREROUTING, it can overwrite the original head fragment and
take over its place, CAN-2005-0449
http://linux.bkbits.net:8080/linux-2.6/cset@41f8843a8ZMCNuP3meYAYnnXd3CO_g

Comment 6 Josh Bressers 2005-04-19 18:52:23 UTC

An advisory has been issued which should help the problem
described in this bug report. This report is therefore being
closed with a resolution of ERRATA. For more information
on the solution and/or where to find the updated files,
please follow the link below. You may reopen this bug report
if the solution does not work for you.

http://rhn.redhat.com/errata/RHSA-2005-366.html