USN-793-1: Linux kernel vulnerabilities

Ubuntu Security Notice USN-793-1

1st July, 2009

linux, linux-source-2.6.15 vulnerabilities

A security issue affects these releases of Ubuntu and its derivatives:

Ubuntu 9.04
Ubuntu 8.10
Ubuntu 8.04 LTS
Ubuntu 6.06 LTS

Software description

linux
linux-source-2.6.15

Details

Igor Zhbanov discovered that NFS clients were able to create device nodes
even when root_squash was enabled. An authenticated remote attacker
could create device nodes with open permissions, leading to a loss of
privacy or escalation of privileges. Only Ubuntu 8.10 and 9.04 were
affected. (CVE-2009-1072)

Dan Carpenter discovered that SELinux did not correctly handle
certain network checks when running with compat_net=1. A local
attacker could exploit this to bypass network checks. Default Ubuntu
installations do not enable SELinux, and only Ubuntu 8.10 and 9.04 were
affected. (CVE-2009-1184)

Shaohua Li discovered that memory was not correctly initialized in the
AGP subsystem. A local attacker could potentially read kernel memory,
leading to a loss of privacy. (CVE-2009-1192)

Benjamin Gilbert discovered that the VMX implementation of KVM did
not correctly handle certain registers. An attacker in a guest VM
could exploit this to cause a host system crash, leading to a denial
of service. This only affected 32bit hosts. Ubuntu 6.06 was not
affected. (CVE-2009-1242)

Thomas Pollet discovered that the Amateur Radio X.25 Packet Layer Protocol
did not correctly validate certain fields. A remote attacker could exploit
this to read kernel memory, leading to a loss of privacy. (CVE-2009-1265)

Trond Myklebust discovered that NFS did not correctly handle certain
long filenames. An authenticated remote attacker could exploit this to
cause a system crash, leading to a denial of service. Only Ubuntu 6.06
was affected. (CVE-2009-1336)

Oleg Nesterov discovered that the kernel did not correctly handle
CAP_KILL. A local user could exploit this to send signals to arbitrary
processes, leading to a denial of service. (CVE-2009-1337)

Daniel Hokka Zakrisson discovered that signal handling was not correctly
limited to process namespaces. A local user could bypass namespace
restrictions, possibly leading to a denial of service. Only Ubuntu 8.04
was affected. (CVE-2009-1338)

Pavel Emelyanov discovered that network namespace support for IPv6 was
not correctly handled. A remote attacker could send specially crafted
IPv6 traffic that would cause a system crash, leading to a denial of
service. Only Ubuntu 8.10 and 9.04 were affected. (CVE-2009-1360)

Neil Horman discovered that the e1000 network driver did not correctly
validate certain fields. A remote attacker could send a specially
crafted packet that would cause a system crash, leading to a denial of
service. (CVE-2009-1385)

Pavan Naregundi discovered that CIFS did not correctly check lengths
when handling certain mount requests. A remote attacker could send
specially crafted traffic to cause a system crash, leading to a denial
of service. (CVE-2009-1439)

Simon Vallet and Frank Filz discovered that execute permissions were
not correctly handled by NFSv4. A local user could bypass permissions
and run restricted programs, possibly leading to an escalation of
privileges. (CVE-2009-1630)

Jeff Layton and Suresh Jayaraman discovered buffer overflows in the CIFS
client code. A malicious remote server could exploit this to cause a
system crash or execute arbitrary code as root. (CVE-2009-1633)

Mikulas Patocka discovered that /proc/iomem was not correctly
initialized on Sparc. A local attacker could use this file to crash
the system, leading to a denial of service. Ubuntu 6.06 was not
affected. (CVE-2009-1914)

Miklos Szeredi discovered that OCFS2 did not correctly handle certain
splice operations. A local attacker could exploit this to cause
a system hang, leading to a denial of service. Ubuntu 6.06 was not
affected. (CVE-2009-1961)

Update instructions

The problem can be corrected by updating your system to the following package version:

Ubuntu 9.04:: linux-image-2.6.28-13-iop32x 2.6.28-13.45; linux-image-2.6.28-13-generic 2.6.28-13.45; linux-image-2.6.28-13-ixp4xx 2.6.28-13.45; linux-image-2.6.28-13-imx51 2.6.28-13.45; linux-image-2.6.28-13-lpia 2.6.28-13.45; linux-image-2.6.28-13-versatile 2.6.28-13.45; linux-image-2.6.28-13-virtual 2.6.28-13.45; linux-image-2.6.28-13-server 2.6.28-13.45
Ubuntu 8.10:: linux-image-2.6.27-14-generic 2.6.27-14.35; linux-image-2.6.27-14-server 2.6.27-14.35; linux-image-2.6.27-14-virtual 2.6.27-14.35
Ubuntu 8.04 LTS:: linux-image-2.6.24-24-sparc64 2.6.24-24.55; linux-image-2.6.24-24-server 2.6.24-24.55; linux-image-2.6.24-24-itanium 2.6.24-24.55; linux-image-2.6.24-24-lpiacompat 2.6.24-24.55; linux-image-2.6.24-24-hppa64 2.6.24-24.55; linux-image-2.6.24-24-virtual 2.6.24-24.55; linux-image-2.6.24-24-powerpc64-smp 2.6.24-24.55; linux-image-2.6.24-24-386 2.6.24-24.55; linux-image-2.6.24-24-generic 2.6.24-24.55; linux-image-2.6.24-24-xen 2.6.24-24.55; linux-image-2.6.24-24-powerpc-smp 2.6.24-24.55; linux-image-2.6.24-24-rt 2.6.24-24.55; linux-image-2.6.24-24-hppa32 2.6.24-24.55; linux-image-2.6.24-24-lpia 2.6.24-24.55; linux-image-2.6.24-24-mckinley 2.6.24-24.55; linux-image-2.6.24-24-sparc64-smp 2.6.24-24.55; linux-image-2.6.24-24-powerpc 2.6.24-24.55; linux-image-2.6.24-24-openvz 2.6.24-24.55
Ubuntu 6.06 LTS:: linux-image-2.6.15-54-hppa64 2.6.15-54.77; linux-image-2.6.15-54-hppa32-smp 2.6.15-54.77; linux-image-2.6.15-54-server-bigiron 2.6.15-54.77; linux-image-2.6.15-54-amd64-generic 2.6.15-54.77; linux-image-2.6.15-54-itanium 2.6.15-54.77; linux-image-2.6.15-54-k7 2.6.15-54.77; linux-image-2.6.15-54-powerpc-smp 2.6.15-54.77; linux-image-2.6.15-54-server 2.6.15-54.77; linux-image-2.6.15-54-amd64-server 2.6.15-54.77; linux-image-2.6.15-54-sparc64-smp 2.6.15-54.77; linux-image-2.6.15-54-sparc64 2.6.15-54.77; linux-image-2.6.15-54-mckinley-smp 2.6.15-54.77; linux-image-2.6.15-54-amd64-k8 2.6.15-54.77; linux-image-2.6.15-54-386 2.6.15-54.77; linux-image-2.6.15-54-mckinley 2.6.15-54.77; linux-image-2.6.15-54-hppa32 2.6.15-54.77; linux-image-2.6.15-54-amd64-xeon 2.6.15-54.77; linux-image-2.6.15-54-powerpc 2.6.15-54.77; linux-image-2.6.15-54-powerpc64-smp 2.6.15-54.77; linux-image-2.6.15-54-itanium-smp 2.6.15-54.77; linux-image-2.6.15-54-686 2.6.15-54.77; linux-image-2.6.15-54-hppa64-smp 2.6.15-54.77

To update your system, please follow these instructions: https://wiki.ubuntu.com/Security/Upgrades.

After a standard system upgrade you need to reboot your computer to
effect the necessary changes.

ATTENTION: Due to an unavoidable ABI change for Ubuntu 8.04, 8.10 and 9.04
the kernel updates have been given a new version number, which requires
you 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. Unless you manually uninstalled the standard kernel metapackages
(e.g. linux-generic, linux-server, linux-powerpc), a standard system
upgrade will automatically perform this as well.

References

CVE-2009-1072, CVE-2009-1184, CVE-2009-1192, CVE-2009-1242, CVE-2009-1265, CVE-2009-1336, CVE-2009-1337, CVE-2009-1338, CVE-2009-1360, CVE-2009-1385, CVE-2009-1439, CVE-2009-1630, CVE-2009-1633, CVE-2009-1914, CVE-2009-1961