int(623)

Boletines de Vulnerabilidades


Compromiso root en Samba 3.x sobre Linux 2.6

Clasificación de la vulnerabilidad

Propiedad Valor
Nivel de Confianza Oficial
Impacto Compromiso Root
Dificultad Principiante
Requerimientos del atacante Acceso remoto con cuenta

Información sobre el sistema

Propiedad Valor
Fabricant afectat GNU/Linux
Software afectado Samba 3.x

Descripción

Se ha descubierto una vulnerabilidad en las versiones 3.x de Samba que permite a un atacante conseguir privilegios de root en una máquina Linux con kernel 2.6.x.

La vulnerabilidad reside en el manejo incorrecto por parte de Samba de los archivos setuid lo que permite a un atacante compartir un archivo setuid (en una máquina bajo su control) y ejecutarlo en la máquina víctima (donde debe tener cuenta de usuario) para conseguir privilegios de root.

Para poder explotar esta vulnerabilidad la máquina víctima debe tener setuid root el binario smbmnt, lo cual es probable si se ha hecho la instalación de samba desde los paquetes que acompañan a la distribución de Linux que se este usando.

Solución

Si lo desea, aplique los mecanismos de actualización propios de su distribución, o bien baje las fuentes del software y compílelo usted mismo.


Actualización de software

Samba
Samba 3.0.2a
http://us4.samba.org/samba/ftp/samba-3.0.2a.tar.gz

Debian Linux

Debian Linux 3.0
Fuentes
http://security.debian.org/pool/updates/main/s/samba/samba_2.2.3a-13.dsc
http://security.debian.org/pool/updates/main/s/samba/samba_2.2.3a-13.diff.gz
http://security.debian.org/pool/updates/main/s/samba/samba_2.2.3a.orig.tar.gz
Paquetes independientes de arquitectura
http://security.debian.org/pool/updates/main/s/samba/samba-doc_2.2.3a-13_all.deb
Alpha
http://security.debian.org/pool/updates/main/s/samba/libpam-smbpass_2.2.3a-13_alpha.deb
http://security.debian.org/pool/updates/main/s/samba/libsmbclient_2.2.3a-13_alpha.deb
http://security.debian.org/pool/updates/main/s/samba/libsmbclient-dev_2.2.3a-13_alpha.deb
http://security.debian.org/pool/updates/main/s/samba/samba_2.2.3a-13_alpha.deb
http://security.debian.org/pool/updates/main/s/samba/samba-common_2.2.3a-13_alpha.deb
http://security.debian.org/pool/updates/main/s/samba/smbclient_2.2.3a-13_alpha.deb
http://security.debian.org/pool/updates/main/s/samba/smbfs_2.2.3a-13_alpha.deb
http://security.debian.org/pool/updates/main/s/samba/swat_2.2.3a-13_alpha.deb
http://security.debian.org/pool/updates/main/s/samba/winbind_2.2.3a-13_alpha.deb
ARM
http://security.debian.org/pool/updates/main/s/samba/libpam-smbpass_2.2.3a-13_arm.deb
http://security.debian.org/pool/updates/main/s/samba/libsmbclient_2.2.3a-13_arm.deb
http://security.debian.org/pool/updates/main/s/samba/libsmbclient-dev_2.2.3a-13_arm.deb
http://security.debian.org/pool/updates/main/s/samba/samba_2.2.3a-13_arm.deb
http://security.debian.org/pool/updates/main/s/samba/samba-common_2.2.3a-13_arm.deb
http://security.debian.org/pool/updates/main/s/samba/smbclient_2.2.3a-13_arm.deb
http://security.debian.org/pool/updates/main/s/samba/smbfs_2.2.3a-13_arm.deb
http://security.debian.org/pool/updates/main/s/samba/swat_2.2.3a-13_arm.deb
http://security.debian.org/pool/updates/main/s/samba/winbind_2.2.3a-13_arm.deb
Intel IA-32
http://security.debian.org/pool/updates/main/s/samba/libpam-smbpass_2.2.3a-13_i386.deb
http://security.debian.org/pool/updates/main/s/samba/libsmbclient_2.2.3a-13_i386.deb
http://security.debian.org/pool/updates/main/s/samba/libsmbclient-dev_2.2.3a-13_i386.deb
http://security.debian.org/pool/updates/main/s/samba/samba_2.2.3a-13_i386.deb
http://security.debian.org/pool/updates/main/s/samba/samba-common_2.2.3a-13_i386.deb
http://security.debian.org/pool/updates/main/s/samba/smbclient_2.2.3a-13_i386.deb
http://security.debian.org/pool/updates/main/s/samba/smbfs_2.2.3a-13_i386.deb
http://security.debian.org/pool/updates/main/s/samba/swat_2.2.3a-13_i386.deb
http://security.debian.org/pool/updates/main/s/samba/winbind_2.2.3a-13_i386.deb
Intel IA-64
http://security.debian.org/pool/updates/main/s/samba/libpam-smbpass_2.2.3a-13_ia64.deb
http://security.debian.org/pool/updates/main/s/samba/libsmbclient_2.2.3a-13_ia64.deb
http://security.debian.org/pool/updates/main/s/samba/libsmbclient-dev_2.2.3a-13_ia64.deb
http://security.debian.org/pool/updates/main/s/samba/samba_2.2.3a-13_ia64.deb
http://security.debian.org/pool/updates/main/s/samba/samba-common_2.2.3a-13_ia64.deb
http://security.debian.org/pool/updates/main/s/samba/smbclient_2.2.3a-13_ia64.deb
http://security.debian.org/pool/updates/main/s/samba/smbfs_2.2.3a-13_ia64.deb
http://security.debian.org/pool/updates/main/s/samba/swat_2.2.3a-13_ia64.deb
http://security.debian.org/pool/updates/main/s/samba/winbind_2.2.3a-13_ia64.deb
HP Precision
http://security.debian.org/pool/updates/main/s/samba/libpam-smbpass_2.2.3a-13_hppa.deb
http://security.debian.org/pool/updates/main/s/samba/libsmbclient_2.2.3a-13_hppa.deb
http://security.debian.org/pool/updates/main/s/samba/libsmbclient-dev_2.2.3a-13_hppa.deb
http://security.debian.org/pool/updates/main/s/samba/samba_2.2.3a-13_hppa.deb
http://security.debian.org/pool/updates/main/s/samba/samba-common_2.2.3a-13_hppa.deb
http://security.debian.org/pool/updates/main/s/samba/smbclient_2.2.3a-13_hppa.deb
http://security.debian.org/pool/updates/main/s/samba/smbfs_2.2.3a-13_hppa.deb
http://security.debian.org/pool/updates/main/s/samba/swat_2.2.3a-13_hppa.deb
http://security.debian.org/pool/updates/main/s/samba/winbind_2.2.3a-13_hppa.deb
Motorola 680x0
http://security.debian.org/pool/updates/main/s/samba/libpam-smbpass_2.2.3a-13_m68k.deb
http://security.debian.org/pool/updates/main/s/samba/libsmbclient_2.2.3a-13_m68k.deb
http://security.debian.org/pool/updates/main/s/samba/libsmbclient-dev_2.2.3a-13_m68k.deb
http://security.debian.org/pool/updates/main/s/samba/samba_2.2.3a-13_m68k.deb
http://security.debian.org/pool/updates/main/s/samba/samba-common_2.2.3a-13_m68k.deb
http://security.debian.org/pool/updates/main/s/samba/smbclient_2.2.3a-13_m68k.deb
http://security.debian.org/pool/updates/main/s/samba/smbfs_2.2.3a-13_m68k.deb
http://security.debian.org/pool/updates/main/s/samba/swat_2.2.3a-13_m68k.deb
http://security.debian.org/pool/updates/main/s/samba/winbind_2.2.3a-13_m68k.deb
Big endian MIPS architecture:
http://security.debian.org/pool/updates/main/s/samba/libpam-smbpass_2.2.3a-13_mips.deb
http://security.debian.org/pool/updates/main/s/samba/libsmbclient_2.2.3a-13_mips.deb
http://security.debian.org/pool/updates/main/s/samba/libsmbclient-dev_2.2.3a-13_mips.deb
http://security.debian.org/pool/updates/main/s/samba/samba_2.2.3a-13_mips.deb
http://security.debian.org/pool/updates/main/s/samba/samba-common_2.2.3a-13_mips.deb
http://security.debian.org/pool/updates/main/s/samba/smbclient_2.2.3a-13_mips.deb
http://security.debian.org/pool/updates/main/s/samba/smbfs_2.2.3a-13_mips.deb
http://security.debian.org/pool/updates/main/s/samba/swat_2.2.3a-13_mips.deb
http://security.debian.org/pool/updates/main/s/samba/winbind_2.2.3a-13_mips.deb
Little endian MIPS
http://security.debian.org/pool/updates/main/s/samba/libpam-smbpass_2.2.3a-12.3_mipsel.deb
http://security.debian.org/pool/updates/main/s/samba/libsmbclient_2.2.3a-12.3_mipsel.deb
http://security.debian.org/pool/updates/main/s/samba/libsmbclient-dev_2.2.3a-12.3_mipsel.deb
http://security.debian.org/pool/updates/main/s/samba/samba_2.2.3a-12.3_mipsel.deb
http://security.debian.org/pool/updates/main/s/samba/samba-common_2.2.3a-12.3_mipsel.deb
http://security.debian.org/pool/updates/main/s/samba/smbclient_2.2.3a-12.3_mipsel.deb
http://security.debian.org/pool/updates/main/s/samba/smbfs_2.2.3a-12.3_mipsel.deb
http://security.debian.org/pool/updates/main/s/samba/swat_2.2.3a-12.3_mipsel.deb
http://security.debian.org/pool/updates/main/s/samba/winbind_2.2.3a-12.3_mipsel.deb
PowerPC
http://security.debian.org/pool/updates/main/s/samba/libpam-smbpass_2.2.3a-13_powerpc.deb
http://security.debian.org/pool/updates/main/s/samba/libsmbclient_2.2.3a-13_powerpc.deb
http://security.debian.org/pool/updates/main/s/samba/libsmbclient-dev_2.2.3a-13_powerpc.deb
http://security.debian.org/pool/updates/main/s/samba/samba_2.2.3a-13_powerpc.deb
http://security.debian.org/pool/updates/main/s/samba/samba-common_2.2.3a-13_powerpc.deb
http://security.debian.org/pool/updates/main/s/samba/smbclient_2.2.3a-13_powerpc.deb
http://security.debian.org/pool/updates/main/s/samba/smbfs_2.2.3a-13_powerpc.deb
http://security.debian.org/pool/updates/main/s/samba/swat_2.2.3a-13_powerpc.deb
http://security.debian.org/pool/updates/main/s/samba/winbind_2.2.3a-13_powerpc.deb
IBM S/390
http://security.debian.org/pool/updates/main/s/samba/libpam-smbpass_2.2.3a-13_s390.deb
http://security.debian.org/pool/updates/main/s/samba/libsmbclient_2.2.3a-13_s390.deb
http://security.debian.org/pool/updates/main/s/samba/libsmbclient-dev_2.2.3a-13_s390.deb
http://security.debian.org/pool/updates/main/s/samba/samba_2.2.3a-13_s390.deb
http://security.debian.org/pool/updates/main/s/samba/samba-common_2.2.3a-13_s390.deb
http://security.debian.org/pool/updates/main/s/samba/smbclient_2.2.3a-13_s390.deb
http://security.debian.org/pool/updates/main/s/samba/smbfs_2.2.3a-13_s390.deb
http://security.debian.org/pool/updates/main/s/samba/swat_2.2.3a-13_s390.deb
http://security.debian.org/pool/updates/main/s/samba/winbind_2.2.3a-13_s390.deb
Sun Sparc
http://security.debian.org/pool/updates/main/s/samba/libpam-smbpass_2.2.3a-13_sparc.deb
http://security.debian.org/pool/updates/main/s/samba/libsmbclient_2.2.3a-13_sparc.deb
http://security.debian.org/pool/updates/main/s/samba/libsmbclient-dev_2.2.3a-13_sparc.deb
http://security.debian.org/pool/updates/main/s/samba/samba_2.2.3a-13_sparc.deb
http://security.debian.org/pool/updates/main/s/samba/samba-common_2.2.3a-13_sparc.deb
http://security.debian.org/pool/updates/main/s/samba/smbclient_2.2.3a-13_sparc.deb
http://security.debian.org/pool/updates/main/s/samba/smbfs_2.2.3a-13_sparc.deb
http://security.debian.org/pool/updates/main/s/samba/swat_2.2.3a-13_sparc.deb
http://security.debian.org/pool/updates/main/s/samba/winbind_2.2.3a-13_sparc.deb

Mandrake Linux

Mandrake Linux 9.1
i386
ftp://ftp.rediris.es/mirror/mandrake/updates/9.1/RPMS/nss_wins-2.2.7a-9.3.91mdk.i586.rpm
ftp://ftp.rediris.es/mirror/mandrake/updates/9.1/RPMS/samba-client-2.2.7a-9.3.91mdk.i586.rpm
ftp://ftp.rediris.es/mirror/mandrake/updates/9.1/RPMS/samba-common-2.2.7a-9.3.91mdk.i586.rpm
ftp://ftp.rediris.es/mirror/mandrake/updates/9.1/RPMS/samba-server-2.2.7a-9.3.91mdk.i586.rpm
ftp://ftp.rediris.es/mirror/mandrake/updates/9.1/RPMS/samba-swat-2.2.7a-9.3.91mdk.i586.rpm
ftp://ftp.rediris.es/mirror/mandrake/updates/9.1/RPMS/samba-winbind-2.2.7a-9.3.91mdk.i586.rpm
ftp://ftp.rediris.es/mirror/mandrake/updates/9.1/SRPMS/samba-2.2.7a-9.3.91mdk.src.rpm
PPC
ftp://ftp.rediris.es/mirror/mandrake/updates/ppc/9.1/RPMS/nss_wins-2.2.7a-9.3.91mdk.ppc.rpm
ftp://ftp.rediris.es/mirror/mandrake/updates/ppc/9.1/RPMS/samba-client-2.2.7a-9.3.91mdk.ppc.rpm
ftp://ftp.rediris.es/mirror/mandrake/updates/ppc/9.1/RPMS/samba-common-2.2.7a-9.3.91mdk.ppc.rpm
ftp://ftp.rediris.es/mirror/mandrake/updates/ppc/9.1/RPMS/samba-server-2.2.7a-9.3.91mdk.ppc.rpm
ftp://ftp.rediris.es/mirror/mandrake/updates/ppc/9.1/RPMS/samba-swat-2.2.7a-9.3.91mdk.ppc.rpm
ftp://ftp.rediris.es/mirror/mandrake/updates/ppc/9.1/RPMS/samba-winbind-2.2.7a-9.3.91mdk.ppc.rpm
ftp://ftp.rediris.es/mirror/mandrake/updates/ppc/9.1/SRPMS/samba-2.2.7a-9.3.91mdk.src.rpm

Mandrake Linux 9.2
i386
ftp://ftp.rediris.es/mirror/mandrake/updates/9.2/RPMS/libsmbclient0-2.2.8a-13.1.92mdk.i586.rpm
ftp://ftp.rediris.es/mirror/mandrake/updates/9.2/RPMS/libsmbclient0-devel-2.2.8a-13.1.92mdk.i586.rpm
ftp://ftp.rediris.es/mirror/mandrake/updates/9.2/RPMS/libsmbclient0-static-devel-2.2.8a-13.1.92mdk.i586.rpm
ftp://ftp.rediris.es/mirror/mandrake/updates/9.2/RPMS/nss_wins-2.2.8a-13.1.92mdk.i586.rpm
ftp://ftp.rediris.es/mirror/mandrake/updates/9.2/RPMS/samba-client-2.2.8a-13.1.92mdk.i586.rpm
ftp://ftp.rediris.es/mirror/mandrake/updates/9.2/RPMS/samba-common-2.2.8a-13.1.92mdk.i586.rpm
ftp://ftp.rediris.es/mirror/mandrake/updates/9.2/RPMS/samba-debug-2.2.8a-13.1.92mdk.i586.rpm
ftp://ftp.rediris.es/mirror/mandrake/updates/9.2/RPMS/samba-server-2.2.8a-13.1.92mdk.i586.rpm
ftp://ftp.rediris.es/mirror/mandrake/updates/9.2/RPMS/samba-swat-2.2.8a-13.1.92mdk.i586.rpm
ftp://ftp.rediris.es/mirror/mandrake/updates/9.2/RPMS/samba-winbind-2.2.8a-13.1.92mdk.i586.rpm
ftp://ftp.rediris.es/mirror/mandrake/updates/9.2/SRPMS/samba-2.2.8a-13.1.92mdk.src.rpm
AMD64
ftp://ftp.rediris.es/mirror/mandrake/updates/amd64/9.2/SRPMS/samba-2.2.8a-13.1.92mdk.src.rpm

Multi Network Firewall 8.2
i386
ftp://ftp.rediris.es/mirror/mandrake/updates/mnf8.2/RPMS/samba-client-2.2.7a-9.3.M82mdk.i586.rpm
ftp://ftp.rediris.es/mirror/mandrake/updates/mnf8.2/RPMS/samba-common-2.2.7a-9.3.M82mdk.i586.rpm
ftp://ftp.rediris.es/mirror/mandrake/updates/mnf8.2/SRPMS/samba-2.2.7a-9.3.M82mdk.src.rpm

Corporate Server 2.1
i386
ftp://ftp.rediris.es/mirror/mandrake/updates/corporate/2.1/RPMS/nss_wins-2.2.7a-10.1.C21mdk.i586.rpm
ftp://ftp.rediris.es/mirror/mandrake/updates/corporate/2.1/RPMS/samba-client-2.2.7a-10.1.C21mdk.i586.rpm
ftp://ftp.rediris.es/mirror/mandrake/updates/corporate/2.1/RPMS/samba-common-2.2.7a-10.1.C21mdk.i586.rpm
ftp://ftp.rediris.es/mirror/mandrake/updates/corporate/2.1/RPMS/samba-server-2.2.7a-10.1.C21mdk.i586.rpm
ftp://ftp.rediris.es/mirror/mandrake/updates/corporate/2.1/RPMS/samba-swat-2.2.7a-10.1.C21mdk.i586.rpm
ftp://ftp.rediris.es/mirror/mandrake/updates/corporate/2.1/RPMS/samba-winbind-2.2.7a-10.1.C21mdk.i586.rpm
ftp://ftp.rediris.es/mirror/mandrake/updates/corporate/2.1/SRPMS/samba-2.2.7a-10.1.C21mdk.src.rpm
x86_64
ftp://ftp.rediris.es/mirror/mandrake/updates/x86_64/corporate/2.1/RPMS/nss_wins-2.2.7a-10.1.C21mdk.x86_64.rpm
ftp://ftp.rediris.es/mirror/mandrake/updates/x86_64/corporate/2.1/RPMS/samba-client-2.2.7a-10.1.C21mdk.x86_64.rpm
ftp://ftp.rediris.es/mirror/mandrake/updates/x86_64/corporate/2.1/RPMS/samba-common-2.2.7a-10.1.C21mdk.x86_64.rpm
ftp://ftp.rediris.es/mirror/mandrake/updates/x86_64/corporate/2.1/RPMS/samba-server-2.2.7a-10.1.C21mdk.x86_64.rpm
ftp://ftp.rediris.es/mirror/mandrake/updates/x86_64/corporate/2.1/RPMS/samba-swat-2.2.7a-10.1.C21mdk.x86_64.rpm
ftp://ftp.rediris.es/mirror/mandrake/updates/x86_64/corporate/2.1/RPMS/samba-winbind-2.2.7a-10.1.C21mdk.x86_64.rpm
ftp://ftp.rediris.es/mirror/mandrake/updates/x86_64/corporate/2.1/SRPMS/samba-2.2.7a-10.1.C21mdk.src.rpm

Identificadores estándar

Propiedad Valor
CVE CAN-2004-0186
BID

Recursos adicionales

X-Force Security Advisory
http://xforce.iss.net/xforce/xfdb/15131

Debian Security Advisory DSA 463-1
http://lists.debian.org/debian-security-announce/debian-security-announce-2004/msg00060.html

MandrakeSoft Security Advisory MDKSA-2004:035
http://www.mandrakesecure.net/en/advisories/advisory.php?name=MDKSA-2004:035

Histórico de versiones

Versión Comentario Data
1.0 Aviso emitido 2004-02-17
1.1 Aviso emitido por Mandrake 2004-04-20
Ministerio de Defensa
CNI
CCN
CCN-CERT