[LUG.ro] Problema de seguridad en casi todas las distros de GNU/Linux

["Sebastián D. Criado"]

El 05/11/09 14:32, Omar Arino escribió:
> 2009/11/4 Omar Arino <oarino en fagdut.org.ar>:
>> El día 4 de noviembre de 2009 22:37, "Sebastián D. Criado"
>> <sebastian.criado en gmail.com> escribió:
>>> Existe un error de null pointer dereference la cual permitiría ganar
>>> privilegios de root. El error sería resuelto por la versión 2.6.32.
>>>
[...]
> 
> OpenSuSE y Novell SuSE ya han reconocido que el problema les afecta y
> que están trabajando en una solución. Otras distribuciones no se han
> pronunciado al respecto.

Package        : linux-2.6
Vulnerability  : privilege escalation/denial of service/sensitive memory 
leak
Problem type   : local
Debian-specific: no
CVE Id(s)      : CVE-2009-3228 CVE-2009-3238 CVE-2009-3547 CVE-2009-3612
                  CVE-2009-3620 CVE-2009-3621 CVE-2009-3638

Notice: Debian 5.0.4, the next point release of Debian 'lenny', will
include a new default value for the mmap_min_addr tunable.  This
change will add an additional safeguard against a class of security
vulnerabilities known as "NULL pointer dereference" vulnerabilities,
but it will need to be overridden when using certain applications.
Additional information about this change, including instructions for
making this change locally in advance of 5.0.4 (recommended), can be
found at:
   http://wiki.debian.org/mmap_min_addr

Several vulnerabilities have been discovered in the Linux kernel that
may lead to a denial of service, sensitive memory leak or privilege
escalation.  The Common Vulnerabilities and Exposures project
identifies the following problems:

CVE-2009-3228

     Eric Dumazet reported an instance of uninitialized kernel memory
     in the network packet scheduler. Local users may be able to
     exploit this issue to read the contents of sensitive kernel
     memory.

CVE-2009-3238

     Linus Torvalds provided a change to the get_random_int() function
     to increase its randomness.

CVE-2009-3547

     Earl Chew discovered a NULL pointer dereference issue in the
     pipe_rdwr_open function which can be used by local users to gain
     elevated privileges.

CVE-2009-3612

     Jiri Pirko discovered a typo in the initialization of a structure
     in the netlink subsystem that may allow local users to gain access
     to sensitive kernel memory.

CVE-2009-3620

     Ben Hutchings discovered an issue in the DRM manager for ATI Rage
     128 graphics adapters. Local users may be able to exploit this
     vulnerability to cause a denial of service (NULL pointer
     dereference).

CVE-2009-3621

     Tomoki Sekiyama discovered a deadlock condition in the UNIX domain
     socket implementation. Local users can exploit this vulnerability
     to cause a denial of service (system hang).

CVE-2009-3638

     David Wagner reported an overflow in the KVM subsystem on i386
     systems. This issue is exploitable by local users with access to
     the /dev/kvm device file.

For the stable distribution (lenny), this problem has been fixed in
version 2.6.26-19lenny2.

For the oldstable distribution (etch), these problems, where
applicable, will be fixed in updates to linux-2.6 and linux-2.6.24.

We recommend that you upgrade your linux-2.6 and user-mode-linux
packages.

Note: Debian carefully tracks all known security issues across every
linux kernel package in all releases under active security support.
However, given the high frequency at which low-severity security
issues are discovered in the kernel and the resource requirements of
doing an update, updates for lower priority issues will normally not
be released for all kernels at the same time. Rather, they will be
released in a staggered or "leap-frog" fashion.

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

                                              Debian 5.0 (lenny)
      user-mode-linux                         2.6.26-1um-2+19lenny2

-- 
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