[USN-82-1] Linux kernel vulnerabilities
Date: Tue, 15 Feb 2005 10:21:50 +0100
From: Martin Pitt <martin.pitt@canonical.com.>
To: [email protected]
Subject: [USN-82-1] Linux kernel vulnerabilities
Message-ID: <20050215092150.GA28241@box79162.elkhouse.de.>
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Ubuntu Security Notice USN-82-1 February 15, 2005
linux-source-2.6.8.1 vulnerabilities
CAN-2005-0176, CAN-2005-0177, CAN-2005-0178
http://oss.sgi.com/archives/netdev/2005-01/msg01036.html
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A security issue affects the following Ubuntu releases:
Ubuntu 4.10 (Warty Warthog)
The following packages are affected:
linux-image-2.6.8.1-5-386
linux-image-2.6.8.1-5-686
linux-image-2.6.8.1-5-686-smp
linux-image-2.6.8.1-5-amd64-generic
linux-image-2.6.8.1-5-amd64-k8
linux-image-2.6.8.1-5-amd64-k8-smp
linux-image-2.6.8.1-5-amd64-xeon
linux-image-2.6.8.1-5-k7
linux-image-2.6.8.1-5-k7-smp
linux-image-2.6.8.1-5-power3
linux-image-2.6.8.1-5-power3-smp
linux-image-2.6.8.1-5-power4
linux-image-2.6.8.1-5-power4-smp
linux-image-2.6.8.1-5-powerpc
linux-image-2.6.8.1-5-powerpc-smp
linux-source-2.6.8.1
The problem can be corrected by upgrading the affected package to
version 2.6.8.1-16.11. You need to reboot the computer after doing a
standard system upgrade to effect the necessary changes.=20
ATTENTION: Due to an unavoidable ABI change this kernel got a new
version number, which requires to recompile and reinstall all third
party kernel modules you might have installed. If you use
linux-restricted-modules, you have to update that package as well to
get modules which work with the new kernel version.=20
Details follow:
CAN-2004-0176:
Michael Kerrisk noticed an insufficient permission checking in the
shmctl() function. Any process was permitted to lock/unlock any
System V shared memory segment that fell within the the
RLIMIT_MEMLOCK limit (that is the maximum size of shared memory that
unprivileged users can acquire). This allowed am unprivileged user
process to unlock locked memory of other processes, thereby allowing
them to be swapped out. Usually locked shared memory is used to
store passphrases and other sensitive content which must not be
written to the swap space (where it could be read out even after a
reboot).
CAN-2005-0177:
OGAWA Hirofumi noticed that the table sizes in nls_ascii.c were
incorrectly set to 128 instead of 256. This caused a buffer overflow
in some cases which could be exploited to crash the kernel.
CAN-2005-0178:
A race condition was found in the terminal handling of the
"setsid()" function, which is used to start new process sessions.
http://oss.sgi.com/archives/netdev/2005-01/msg01036.html:
David Coulson noticed a design flaw in the netfilter/iptables module.
By sending specially crafted packets, a remote attacker could exploit
this to crash the kernel or to bypass firewall rules.
Fixing this vulnerability required a change in the Application
Binary Interface (ABI) of the kernel. This means that third party
user installed modules might not work any more with the new kernel,
so this fixed kernel has a new ABI version number. You have to
recompile and reinstall all third party modules.
Source archives:
http://security.ubuntu.com/ubuntu/pool/main/l/linux-source-2.6.8.1/linu=
x-source-2.6.8.1_2.6.8.1-16.11.diff.gz
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Architecture independent packages:
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