Agujero OpenSSH en RedHat Enterprise/CentOS

WebTech · 23 Ago 2008 a las 02:37

Actualización crítica de seguridad de OpenSSH:

Versiones afectadas:

Red Hat Desktop (v. 4)
Red Hat Enterprise Linux (v. 5 server)
Red Hat Enterprise Linux AS (v. 4)
Red Hat Enterprise Linux AS (v. 4.5.z)
Red Hat Enterprise Linux Desktop (v. 5 client)
Red Hat Enterprise Linux ES (v. 4)
Red Hat Enterprise Linux ES (v. 4.5.z)
Red Hat Enterprise Linux WS (v. 4)

Sistemas con CentOS derivados de estas versiones también verán que tienen los paquetes disponibles para actualizar desde los repositorios.

Details

Updated openssh packages are now available for Red Hat Enterprise Linux 4,
Red Hat Enterprise Linux 5, and Red Hat Enterprise Linux 4.5 Extended
Update Support.

This update has been rated as having critical security impact by the Red
Hat Security Response Team.

OpenSSH is OpenBSD's SSH (Secure SHell) protocol implementation.

Last week Red Hat detected an intrusion on certain of its computer systems
and took immediate action. While the investigation into the intrusion is
on-going, our initial focus was to review and test the distribution
channel we use with our customers, Red Hat Network (RHN) and its associated
security measures. Based on these efforts, we remain highly confident that
our systems and processes prevented the intrusion from compromising RHN or
the content distributed via RHN and accordingly believe that customers who
keep their systems updated using Red Hat Network are not at risk. We are
issuing this alert primarily for those who may obtain Red Hat binary
packages via channels other than those of official Red Hat subscribers.

In connection with the incident, the intruder was able to sign a small
number of OpenSSH packages relating only to Red Hat Enterprise Linux 4
(i386 and x86_64 architectures only) and Red Hat Enterprise Linux 5 (x86_64
architecture only). As a precautionary measure, we are releasing an
updated version of these packages, and have published a list of the
tampered packages and how to detect them at
http://www.redhat.com/security/data/openssh-blacklist.html

To reiterate, our processes and efforts to date indicate that packages
obtained by Red Hat Enterprise Linux subscribers via Red Hat Network are
not at risk.

These packages also fix a low severity flaw in the way ssh handles X11
cookies when creating X11 forwarding connections. When ssh was unable to
create untrusted cookie, ssh used a trusted cookie instead, possibly
allowing the administrative user of a untrusted remote server, or untrusted
application run on the remote server, to gain unintended access to a users
local X server. (CVE-2007-4752)
Hacer clic para expandir...

Solución:
CODE, HTML o PHP Insertado:
[B]yum update[/B]

o bien:

[B]up2date -u[/B]
Como saber si estás infectado:
CODE, HTML o PHP Insertado:
wget [url]https://www.redhat.com/security/data/openssh-blacklist-1.0.sh[/url]
bash ./openssh-blacklist-1.0.sh
Si estás limpio deberías ver esto:
CODE, HTML o PHP Insertado:
   bash ./openssh-blacklist-1.0.sh
[B]   PASS: no suspect packages were found on this system[/B]
Todos los detalles en:
https://rhn.redhat.com/errata/RHSA-2008-0855.html
http://www.redhat.com/security/data/openssh-blacklist.html

Saludos,

Anunciante

Adsl5mb · 23 Ago 2008 a las 22:17

Gracias por la información

Accede o regístrate

Agujero OpenSSH en RedHat Enterprise/CentOS

WebTech Súper Moderador Miembro del Staff Moderador CH

Anunciante

Adsl5mb Usuario activo

Accede o regístrate

Agujero OpenSSH en RedHat Enterprise/CentOS

WebTech Súper Moderador Miembro del Staff Moderador CH

Anunciante

Adsl5mb Usuario activo

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