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Boletines de Vulnerabilidades


Denegación de Servicio en el servidor smbd de Samba

Clasificación de la vulnerabilidad

Propiedad Valor
Nivel de Confianza Oficial
Impacto Denegación de Servicio
Dificultad Avanzado
Requerimientos del atacante Acceso remoto sin cuenta a un servicio estandar

Información sobre el sistema

Propiedad Valor
Fabricant afectat GNU/Linux
Software afectado Samba 3.0.x <=v3.0.6

Descripción

Se ha descubierto una vulnerabilidad en el servidor smbd de las versiones 3.0.x menores o igual a la 3.0.6 de Samba.

La vulnerabilidad reside en el parseo de ASN.1 y permite a un atacante remoto sin autenticación enviar múltiples peticiones malformadas que pueden provocar un consumo de los recursos del sistema ya que cada una de las peticiones arrancará un nuevo proceso que entrara en un bucle infinito lo que puede resultar en una denegación de servicio del sistema.

Solución



Actualización de software

Samba
Samba 3.0.5 - Parche
http://download.samba.org/samba/ftp/patches/security/

Mandrake Linux

Mandrakelinux 10.0
x86
ftp://ftp.ps.pl/mirrors/Mandrakelinux/official/updates/10.0/RPMS/libsmbclient0-3.0.6-4.1.100mdk.i586.rpm
ftp://ftp.ps.pl/mirrors/Mandrakelinux/official/updates/10.0/RPMS/libsmbclient0-devel-3.0.6-4.1.100mdk.i586.rpm
ftp://ftp.ps.pl/mirrors/Mandrakelinux/official/updates/10.0/RPMS/libsmbclient0-static-devel-3.0.6-4.1.100mdk.i586.rpm
ftp://ftp.ps.pl/mirrors/Mandrakelinux/official/updates/10.0/RPMS/nss_wins-3.0.6-4.1.100mdk.i586.rpm
ftp://ftp.ps.pl/mirrors/Mandrakelinux/official/updates/10.0/RPMS/samba-client-3.0.6-4.1.100mdk.i586.rpm
ftp://ftp.ps.pl/mirrors/Mandrakelinux/official/updates/10.0/RPMS/samba-common-3.0.6-4.1.100mdk.i586.rpm
ftp://ftp.ps.pl/mirrors/Mandrakelinux/official/updates/10.0/RPMS/samba-doc-3.0.6-4.1.100mdk.i586.rpm
ftp://ftp.ps.pl/mirrors/Mandrakelinux/official/updates/10.0/RPMS/samba-passdb-mysql-3.0.6-4.1.100mdk.i586.rpm
ftp://ftp.ps.pl/mirrors/Mandrakelinux/official/updates/10.0/RPMS/samba-passdb-pgsql-3.0.6-4.1.100mdk.i586.rpm
ftp://ftp.ps.pl/mirrors/Mandrakelinux/official/updates/10.0/RPMS/samba-passdb-xml-3.0.6-4.1.100mdk.i586.rpm
ftp://ftp.ps.pl/mirrors/Mandrakelinux/official/updates/10.0/RPMS/samba-server-3.0.6-4.1.100mdk.i586.rpm
ftp://ftp.ps.pl/mirrors/Mandrakelinux/official/updates/10.0/RPMS/samba-swat-3.0.6-4.1.100mdk.i586.rpm
ftp://ftp.ps.pl/mirrors/Mandrakelinux/official/updates/10.0/RPMS/samba-winbind-3.0.6-4.1.100mdk.i586.rpm
ftp://ftp.ps.pl/mirrors/Mandrakelinux/official/updates/10.0/SRPMS/samba-3.0.6-4.1.100mdk.src.rpm
AMD64
ftp://ftp.ps.pl/mirrors/Mandrakelinux/official/updates/amd64/10.0/RPMS/lib64smbclient0-3.0.6-4.1.100mdk.amd64.rpm
ftp://ftp.ps.pl/mirrors/Mandrakelinux/official/updates/amd64/10.0/RPMS/lib64smbclient0-devel-3.0.6-4.1.100mdk.amd64.rpm
ftp://ftp.ps.pl/mirrors/Mandrakelinux/official/updates/amd64/10.0/RPMS/lib64smbclient0-static-devel-3.0.6-4.1.100mdk.amd64.rpm
ftp://ftp.ps.pl/mirrors/Mandrakelinux/official/updates/amd64/10.0/RPMS/nss_wins-3.0.6-4.1.100mdk.amd64.rpm
ftp://ftp.ps.pl/mirrors/Mandrakelinux/official/updates/amd64/10.0/RPMS/samba-client-3.0.6-4.1.100mdk.amd64.rpm
ftp://ftp.ps.pl/mirrors/Mandrakelinux/official/updates/amd64/10.0/RPMS/samba-common-3.0.6-4.1.100mdk.amd64.rpm
ftp://ftp.ps.pl/mirrors/Mandrakelinux/official/updates/amd64/10.0/RPMS/samba-doc-3.0.6-4.1.100mdk.amd64.rpm
ftp://ftp.ps.pl/mirrors/Mandrakelinux/official/updates/amd64/10.0/RPMS/samba-passdb-mysql-3.0.6-4.1.100mdk.amd64.rpm
ftp://ftp.ps.pl/mirrors/Mandrakelinux/official/updates/amd64/10.0/RPMS/samba-passdb-pgsql-3.0.6-4.1.100mdk.amd64.rpm
ftp://ftp.ps.pl/mirrors/Mandrakelinux/official/updates/amd64/10.0/RPMS/samba-passdb-xml-3.0.6-4.1.100mdk.amd64.rpm
ftp://ftp.ps.pl/mirrors/Mandrakelinux/official/updates/amd64/10.0/RPMS/samba-server-3.0.6-4.1.100mdk.amd64.rpm
ftp://ftp.ps.pl/mirrors/Mandrakelinux/official/updates/amd64/10.0/RPMS/samba-swat-3.0.6-4.1.100mdk.amd64.rpm
ftp://ftp.ps.pl/mirrors/Mandrakelinux/official/updates/amd64/10.0/RPMS/samba-winbind-3.0.6-4.1.100mdk.amd64.rpm

Red Hat Linux

Red Hat Desktop (v. 3)
AMD64
samba-3.0.7-1.3E.x86_64.rpm
samba-client-3.0.7-1.3E.x86_64.rpm
samba-common-3.0.7-1.3E.x86_64.rpm
samba-swat-3.0.7-1.3E.x86_64.rpm
SRPMS
samba-3.0.7-1.3E.src.rpm
i386
samba-3.0.7-1.3E.i386.rpm
samba-client-3.0.7-1.3E.i386.rpm
samba-common-3.0.7-1.3E.i386.rpm
samba-swat-3.0.7-1.3E.i386.rpm
samba-3.0.7-1.3E.i386.rpm
https://rhn.redhat.com/

Red Hat Enterprise Linux AS (v. 3)
AMD64
samba-3.0.7-1.3E.x86_64.rpm
samba-client-3.0.7-1.3E.x86_64.rpm
samba-common-3.0.7-1.3E.x86_64.rpm
samba-swat-3.0.7-1.3E.x86_64.rpm
SRPMS
samba-3.0.7-1.3E.src.rpm
i386
samba-3.0.7-1.3E.i386.rpm
samba-client-3.0.7-1.3E.i386.rpm
samba-common-3.0.7-1.3E.i386.rpm
samba-swat-3.0.7-1.3E.i386.rpm
samba-3.0.7-1.3E.i386.rpm
samba-3.0.7-1.3E.i386.rpm
ia64
samba-3.0.7-1.3E.ia64.rpm
samba-client-3.0.7-1.3E.ia64.rpm
samba-common-3.0.7-1.3E.ia64.rpm
samba-swat-3.0.7-1.3E.ia64.rpm
ppc
samba-3.0.7-1.3E.ppc.rpm
samba-client-3.0.7-1.3E.ppc.rpm
samba-common-3.0.7-1.3E.ppc.rpm
samba-swat-3.0.7-1.3E.ppc.rpm
s390
samba-3.0.7-1.3E.s390.rpm
samba-client-3.0.7-1.3E.s390.rpm
samba-common-3.0.7-1.3E.s390.rpm
samba-swat-3.0.7-1.3E.s390.rpm
samba-3.0.7-1.3E.s390.rpm
s390x
samba-3.0.7-1.3E.s390x.rpm
samba-client-3.0.7-1.3E.s390x.rpm
samba-common-3.0.7-1.3E.s390x.rpm
samba-swat-3.0.7-1.3E.s390x.rpm
https://rhn.redhat.com/

Red Hat Enterprise Linux ES (v. 3)
AMD64
samba-3.0.7-1.3E.x86_64.rpm
samba-client-3.0.7-1.3E.x86_64.rpm
samba-common-3.0.7-1.3E.x86_64.rpm
samba-swat-3.0.7-1.3E.x86_64.rpm
SRPMS
samba-3.0.7-1.3E.src.rpm
i386
samba-3.0.7-1.3E.i386.rpm
samba-client-3.0.7-1.3E.i386.rpm
samba-common-3.0.7-1.3E.i386.rpm
samba-swat-3.0.7-1.3E.i386.rpm
samba-3.0.7-1.3E.i386.rpm
samba-3.0.7-1.3E.i386.rpm
ia64
samba-3.0.7-1.3E.ia64.rpm
samba-client-3.0.7-1.3E.ia64.rpm
samba-common-3.0.7-1.3E.ia64.rpm
samba-swat-3.0.7-1.3E.ia64.rpm
https://rhn.redhat.com/

Red Hat Enterprise Linux WS (v. 3)
AMD64
samba-3.0.7-1.3E.x86_64.rpm
samba-client-3.0.7-1.3E.x86_64.rpm
samba-common-3.0.7-1.3E.x86_64.rpm
samba-swat-3.0.7-1.3E.x86_64.rpm
SRPMS
samba-3.0.7-1.3E.src.rpm
i386
samba-3.0.7-1.3E.i386.rpm
samba-client-3.0.7-1.3E.i386.rpm
samba-common-3.0.7-1.3E.i386.rpm
samba-swat-3.0.7-1.3E.i386.rpm
samba-3.0.7-1.3E.i386.rpm
samba-3.0.7-1.3E.i386.rpm
ia64
samba-3.0.7-1.3E.ia64.rpm
samba-client-3.0.7-1.3E.ia64.rpm
samba-common-3.0.7-1.3E.ia64.rpm
samba-swat-3.0.7-1.3E.ia64.rpm
https://rhn.redhat.com/

IRIX
IRIX 6.5.22, IRIX 6.5.23, IRIX 6.5.24, IRIX 6.5.25, IRIX 6.5.26 - Instale el parche 5798
ftp://patches.sgi.com/

Identificadores estándar

Propiedad Valor
CVE CAN-2004-0807
BID

Recursos adicionales

Samba announce: Samba 3.0.x Denial of Service Flaw
http://us1.samba.org/samba/history/3.0_DOS_sept04_announce.txt

iDEFENSE Security Advisory 09.13.04b
http://www.idefense.com/application/poi/display?id=139&type=vulnerabilities

Mandrakesoft Security Advisory MDKSA-2004:092
http://www.mandrakesoft.com/security/advisories?name=MDKSA-2004:092

Red Hat Security Advisory RHSA-2004:467-04
https://rhn.redhat.com/errata/RHSA-2004-467.html

SGI Security Advisory (20041201-01-P)
ftp://patches.sgi.com/support/free/security/advisories/20041201-01-P.asc

Histórico de versiones

Versión Comentario Data
1.0 Aviso emitido 2004-09-14
1.1 Aviso emitido por Red Hat (RHSA-2004:467-04) 2004-09-23
1.2 Aviso emitido por SGI (20041201-01-P) 2004-12-10
Ministerio de Defensa
CNI
CCN
CCN-CERT