int(1019)

Boletines de Vulnerabilidades


Denegación de Servicio en el servidor nmbd 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
Fabricante afectado GNU/Linux
Software afectado Samba 3.0.x <=v3.0.6

Descripción

Se ha descubierto un error de validación de entrada en el servidor nmbd de las versiones 3.0.x menores o igual a la 3.0.6 de Samba. La vulnerabilidad reside en el manejo de las peticiones SAM_UAS_CHANGE por parte de la función process_logon_packet().

La explotación de esta vulnerabilidad podría permitir a un atacante remoto provocar una situación de denegación de servicio del servidor nmbd mediante un paquete UDP malformado.

Es importante notar que esta vulnerabilidad solamente es explotable cuando el demonio nmbd ha sido configurado para aceptar conexiones de dominio.

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/

Identificadores estándar

Propiedad Valor
CVE CAN-2004-0808
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 09.13.04a
www.idefense.com/application/poi/display?id=138&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

Histórico de versiones

Versión Comentario Fecha
1.0 Aviso emitido 2004-09-14
1.1 Aviso emitido por Red Hat (RHSA-2004:467-04) 2004-09-23

Miembros de

Ministerio de Defensa
CNI
CCN
CCN-CERT