Red Hat Bugzilla – Bug 147468
CAN-2005-0449 Possible remote Oops/firewall bypass - kABI breaker
Last modified: 2007-11-30 17:07:16 EST
vendor-sec made us aware of a security relevant problem yesterday (remote
opps/firewall bypass) in the netdev code.
This is the relevant thread:
Passed to PeterM for investigation, the patch breaks kABI.
Making public, has gained vendor fixes and CVE name.
Note that this issue is only exploitable on SMP
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:
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
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.