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Advisories, June 27, 2006

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June 28, 2006

Debian GNU/Linux

Debian Security Advisory DSA 1103-1 security@debian.org
http://www.debian.org/security/
Dann Frazier, Troy Heber
June 27th, 2006 http://www.debian.org/security/faq

Package : kernel-source-2.6.8
Vulnerability : several
Problem-Type : local/remote
Debian-specific: no
CVE ID : CVE-2005-3359 CVE-2006-0038 CVE-2006-0039 CVE-2006-0456
CVE-2006-0554 CVE-2006-0555 CVE-2006-0557 CVE-2006-0558
CVE-2006-0741 CVE-2006-0742 CVE-2006-0744 CVE-2006-1056
CVE-2006-1242 CVE-2006-1368 CVE-2006-1523 CVE-2006-1524
CVE-2006-1525 CVE-2006-1857 CVE-2006-1858 CVE-2006-1863
CVE-2006-1864 CVE-2006-2271 CVE-2006-2272 CVE-2006-2274

Several local and remote vulnerabilities have been discovered in
the Linux kernel that may lead to a denial of service or the
execution of arbitrary code. The Common Vulnerabilities and
Exposures project identifies the following problems:

CVE-2005-3359

Franz Filz discovered that some socket calls permit causing
inconsistent reference counts on loadable modules, which allows
local users to cause a denial of service.

CVE-2006-0038

“Solar Designer” discovered that arithmetic computations in
netfilter’s do_replace() function can lead to a buffer overflow and
the execution of arbitrary code. However, the operation requires
CAP_NET_ADMIN privileges, which is only an issue in virtualization
systems or fine grained access control systems.

CVE-2006-0039

“Solar Designer” discovered a race condition in netfilter’s
do_add_counters() function, which allows information disclosure of
kernel memory by exploiting a race condition. Likewise, it requires
CAP_NET_ADMIN privileges.

CVE-2006-0456

David Howells discovered that the s390 assembly version of the
strnlen_user() function incorrectly returns some string size
values.

CVE-2006-0554

It was discovered that the ftruncate() function of XFS can
expose unallocated, which allows information disclosure of
previously deleted files.

CVE-2006-0555

It was discovered that some NFS file operations on handles
mounted with O_DIRECT can force the kernel into a crash.

CVE-2006-0557

It was discovered that the code to configure memory policies
allows tricking the kernel into a crash, thus allowing denial of
service.

CVE-2006-0558

It was discovered by Cliff Wickman that perfmon for the IA64
architecture allows users to trigger a BUG() assert, which allows
denial of service.

CVE-2006-0741

Intel EM64T systems were discovered to be susceptible to a local
DoS due to an endless recursive fault related to a bad elf entry
address.

CVE-2006-0742

Alan and Gareth discovered that the ia64 platform had an
incorrectly declared die_if_kernel() function as “does never
return” which could be exploited by a local attacker resulting in a
kernel crash.

CVE-2006-0744

The Linux kernel did not properly handle uncanonical return
addresses on Intel EM64T CPUs, reporting exceptions in the SYSRET
instead of the next instruction, causing the kernel exception
handler to run on the user stack with the wrong GS. This may result
in a DoS due to a local user changing the frames.

CVE-2006-1056

AMD64 machines (and other 7th and 8th generation AuthenticAMD
processors) were found to be vulnerable to sensitive information
leakage, due to how they handle saving and restoring the FOP, FIP,
and FDP x87 registers in FXSAVE/FXRSTOR when an exception is
pending. This allows a process to determine portions of the state
of floating point instructions of other processes.

CVE-2006-1242

Marco Ivaldi discovered that there was an unintended information
disclosure allowing remote attackers to bypass protections against
Idle Scans (nmap -sI) by abusing the ID field of IP packets and
bypassing the zero IP ID in DF packet countermeasure. This was a
result of the ip_push_pending_frames function improperly
incremented the IP ID field when sending a RST after receiving
unsolicited TCP SYN-ACK packets.

CVE-2006-1368

Shaun Tancheff discovered a buffer overflow (boundry condition
error) in the USB Gadget RNDIS implementation allowing remote
attackers to cause a DoS. While creating a reply message, the
driver allocated memory for the reply data, but not for the reply
structure. The kernel fails to properly bounds-check user-supplied
data before copying it to an insufficiently sized memory buffer.
Attackers could crash the system, or possibly execute arbitrary
machine code.

CVE-2006-1523

Oleg Nesterov reported an unsafe BUG_ON call in signal.c which
was introduced by RCU signal handling. The BUG_ON code is protected
by siglock while the code in switch_exit_pids() uses tasklist_lock.
It may be possible for local users to exploit this to initiate a
denial of service attack (DoS).

CVE-2006-1524

Hugh Dickins discovered an issue in the madvise_remove function
wherein file and mmap restrictions are not followed, allowing local
users to bypass IPC permissions and replace portions of readonly
tmpfs files with zeroes.

CVE-2006-1525

Alexandra Kossovsky reported a NULL pointer dereference
condition in ip_route_input() that can be triggered by a local user
by requesting a route for a multicast IP address, resulting in a
denial of service (panic).

CVE-2006-1857

Vlad Yasevich reported a data validation issue in the SCTP
subsystem that may allow a remote user to overflow a buffer using a
badly formatted HB-ACK chunk, resulting in a denial of service.

CVE-2006-1858

Vlad Yasevich reported a bug in the bounds checking code in the
SCTP subsystem that may allow a remote attacker to trigger a denial
of service attack when rounded parameter lengths are used to
calculate parameter lengths instead of the actual values.

CVE-2006-1863

Mark Mosely discovered that chroots residing on an CIFS share
can be escaped with specially crafted “cd” sequences.

CVE-2006-1864

Mark Mosely discovered that chroots residing on an SMB share can
be escaped with specially crafted “cd” sequences.

CVE-2006-2271

The “Mu security team” discovered that carefully crafted ECNE
chunks can cause a kernel crash by accessing incorrect state stable
entries in the SCTP networking subsystem, which allows denial of
service.

CVE-2006-2272

The “Mu security team” discovered that fragmented SCTP control
chunks can trigger kernel panics, which allows for denial of
service attacks.

CVE-2006-2274

It was discovered that SCTP packets with two initial bundled
data packets can lead to infinite recursion, which allows for
denial of service attacks.

The following matrix explains which kernel version for which
architecture fix the problems mentioned above:

                                 Debian 3.1 (sarge)
     Source                      2.6.8-16sarge3
     Alpha architecture          2.6.8-16sarge3
     HP Precision architecture   2.6.8-6sarge3
     Intel IA-32 architecture    2.6.8-16sarge3
     Intel IA-64 architecture    2.6.8-14sarge3
     Motorola 680x0 architecture 2.6.8-4sarge3
     PowerPC architecture        2.6.8-12sarge3
     IBM S/390 architecture      2.6.8-5sarge3
     Sun Sparc architecture      2.6.8-15sarge3

Due to technical problems the built amd64 packages couldn’t be
processed by the archive script. Once this problem is resolved, an
updated DSA 1103-2 will be sent out with the checksums for
amd64.

The following matrix lists additional packages that were rebuilt
for compatibility with or to take advantage of this update:

                                 Debian 3.1 (sarge)
     fai-kernels                 1.9.1sarge2

We recommend that you upgrade your kernel package immediately
and reboot the machine. If you have built a custom kernel from the
kernel source package, you will need to rebuild to take advantage
of these fixes.

Upgrade Instructions

wget url

will fetch the file for you
dpkg -i file.deb

will install the referenced file.

If you are using the apt-get package manager, use the line for
sources.list as given below:

apt-get update

will update the internal database apt-get upgrade

will install corrected packages

You may use an automated update by adding the resources from the
footer to the proper configuration.

Debian GNU/Linux 3.1 alias sarge

Source archives:

http://security.debian.org/pool/updates/main/k/kernel-source-2.6.8/kernel-source-2.6.8_2.6.8-16sarge3.dsc