Vulnerability Bulletins |
Desbordamiento de búfer en servidor NFS |
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Vulnerability classification |
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| Property | Value |
| Confidence level | Oficial |
| Impact | Compromiso Root |
| Dificulty | Experto |
| Required attacker level | Acceso remoto sin cuenta a un servicio estandar |
System information |
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| Property | Value |
| Affected manufacturer | GNU/Linux |
| Affected software | NFS server |
Description |
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Se ha descubierto una vulnerabilidad en el servidor NFS. La vulnerabilidad reside en un desbordamiento de búfer debido a que no se suministra suficiente espacio a la función "realpath" de "rpc.mountd" al procesar peticiones de montaje. Un atacante remoto podría ejecutar código arbitrario mediante una petición a rpc.mountd especialmente diseñada. Se ha verificado que la ejecución de código es posible si el atacante puede crear enlaces simbólicos en cualquiera de los sistemas de ficheros en los que se ejecuta el servidor NFS vulnerable (/tmp , /home/attacker o similar). Para los atacantes sin acceso al sistema de ficheros la explotación es posible. |
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Solution |
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Actualización de software Suse Linux Las actualizaciones pueden descargarse mediante YAST o del servidor FTP oficial de Suse Linux Debian Debian Linux 3.0 Source http://security.debian.org/pool/updates/main/n/nfs-user-server/nfs-user-server_2.2beta47-12woody1.dsc http://security.debian.org/pool/updates/main/n/nfs-user-server/nfs-user-server_2.2beta47-12woody1.diff.gz http://security.debian.org/pool/updates/main/n/nfs-user-server/nfs-user-server_2.2beta47.orig.tar.gz Alpha http://security.debian.org/pool/updates/main/n/nfs-user-server/nfs-user-server_2.2beta47-12woody1_alpha.deb http://security.debian.org/pool/updates/main/n/nfs-user-server/ugidd_2.2beta47-12woody1_alpha.deb ARM http://security.debian.org/pool/updates/main/n/nfs-user-server/nfs-user-server_2.2beta47-12woody1_arm.deb http://security.debian.org/pool/updates/main/n/nfs-user-server/ugidd_2.2beta47-12woody1_arm.deb Intel IA-32 http://security.debian.org/pool/updates/main/n/nfs-user-server/nfs-user-server_2.2beta47-12woody1_i386.deb http://security.debian.org/pool/updates/main/n/nfs-user-server/ugidd_2.2beta47-12woody1_i386.deb Intel IA-64 http://security.debian.org/pool/updates/main/n/nfs-user-server/nfs-user-server_2.2beta47-12woody1_ia64.deb http://security.debian.org/pool/updates/main/n/nfs-user-server/ugidd_2.2beta47-12woody1_ia64.deb HP Precision http://security.debian.org/pool/updates/main/n/nfs-user-server/nfs-user-server_2.2beta47-12woody1_hppa.deb http://security.debian.org/pool/updates/main/n/nfs-user-server/ugidd_2.2beta47-12woody1_hppa.deb Motorola 680x0 http://security.debian.org/pool/updates/main/n/nfs-user-server/nfs-user-server_2.2beta47-12woody1_m68k.deb http://security.debian.org/pool/updates/main/n/nfs-user-server/ugidd_2.2beta47-12woody1_m68k.deb Big endian MIPS http://security.debian.org/pool/updates/main/n/nfs-user-server/nfs-user-server_2.2beta47-12woody1_mips.deb http://security.debian.org/pool/updates/main/n/nfs-user-server/ugidd_2.2beta47-12woody1_mips.deb Little endian MIPS http://security.debian.org/pool/updates/main/n/nfs-user-server/nfs-user-server_2.2beta47-12woody1_mipsel.deb http://security.debian.org/pool/updates/main/n/nfs-user-server/ugidd_2.2beta47-12woody1_mipsel.deb PowerPC http://security.debian.org/pool/updates/main/n/nfs-user-server/nfs-user-server_2.2beta47-12woody1_powerpc.deb http://security.debian.org/pool/updates/main/n/nfs-user-server/ugidd_2.2beta47-12woody1_powerpc.deb IBM S/390 http://security.debian.org/pool/updates/main/n/nfs-user-server/nfs-user-server_2.2beta47-12woody1_s390.deb http://security.debian.org/pool/updates/main/n/nfs-user-server/ugidd_2.2beta47-12woody1_s390.deb Sun Sparc http://security.debian.org/pool/updates/main/n/nfs-user-server/nfs-user-server_2.2beta47-12woody1_sparc.deb http://security.debian.org/pool/updates/main/n/nfs-user-server/ugidd_2.2beta47-12woody1_sparc.deb Debian Linux 3.1 Source http://security.debian.org/pool/updates/main/n/nfs-user-server/nfs-user-server_2.2beta47-20sarge2.dsc http://security.debian.org/pool/updates/main/n/nfs-user-server/nfs-user-server_2.2beta47-20sarge2.diff.gz http://security.debian.org/pool/updates/main/n/nfs-user-server/nfs-user-server_2.2beta47.orig.tar.gz Alpha http://security.debian.org/pool/updates/main/n/nfs-user-server/nfs-user-server_2.2beta47-20sarge2_alpha.deb http://security.debian.org/pool/updates/main/n/nfs-user-server/ugidd_2.2beta47-20sarge2_alpha.deb AMD64 http://security.debian.org/pool/updates/main/n/nfs-user-server/nfs-user-server_2.2beta47-20sarge2_amd64.deb http://security.debian.org/pool/updates/main/n/nfs-user-server/ugidd_2.2beta47-20sarge2_amd64.deb ARM http://security.debian.org/pool/updates/main/n/nfs-user-server/nfs-user-server_2.2beta47-20sarge2_arm.deb http://security.debian.org/pool/updates/main/n/nfs-user-server/ugidd_2.2beta47-20sarge2_arm.deb Intel IA-32 http://security.debian.org/pool/updates/main/n/nfs-user-server/nfs-user-server_2.2beta47-20sarge2_i386.deb http://security.debian.org/pool/updates/main/n/nfs-user-server/ugidd_2.2beta47-20sarge2_i386.deb Intel IA-64 http://security.debian.org/pool/updates/main/n/nfs-user-server/nfs-user-server_2.2beta47-20sarge2_ia64.deb http://security.debian.org/pool/updates/main/n/nfs-user-server/ugidd_2.2beta47-20sarge2_ia64.deb HP Precision http://security.debian.org/pool/updates/main/n/nfs-user-server/nfs-user-server_2.2beta47-20sarge2_hppa.deb http://security.debian.org/pool/updates/main/n/nfs-user-server/ugidd_2.2beta47-20sarge2_hppa.deb Motorola 680x0 http://security.debian.org/pool/updates/main/n/nfs-user-server/nfs-user-server_2.2beta47-20sarge2_m68k.deb http://security.debian.org/pool/updates/main/n/nfs-user-server/ugidd_2.2beta47-20sarge2_m68k.deb Big endian MIPS http://security.debian.org/pool/updates/main/n/nfs-user-server/nfs-user-server_2.2beta47-20sarge2_mips.deb http://security.debian.org/pool/updates/main/n/nfs-user-server/ugidd_2.2beta47-20sarge2_mips.deb Little endian MIPS http://security.debian.org/pool/updates/main/n/nfs-user-server/nfs-user-server_2.2beta47-20sarge2_mipsel.deb http://security.debian.org/pool/updates/main/n/nfs-user-server/ugidd_2.2beta47-20sarge2_mipsel.deb PowerPC http://security.debian.org/pool/updates/main/n/nfs-user-server/nfs-user-server_2.2beta47-20sarge2_powerpc.deb http://security.debian.org/pool/updates/main/n/nfs-user-server/ugidd_2.2beta47-20sarge2_powerpc.deb IBM S/390 http://security.debian.org/pool/updates/main/n/nfs-user-server/nfs-user-server_2.2beta47-20sarge2_s390.deb http://security.debian.org/pool/updates/main/n/nfs-user-server/ugidd_2.2beta47-20sarge2_s390.deb Sun Sparc http://security.debian.org/pool/updates/main/n/nfs-user-server/nfs-user-server_2.2beta47-20sarge2_sparc.deb http://security.debian.org/pool/updates/main/n/nfs-user-server/ugidd_2.2beta47-20sarge2_sparc.deb |
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Standar resources |
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| Property | Value |
| CVE | CVE-2006-0043 |
| BID | |
Other resources |
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SUSE Security Advisory (SUSE-SA:2006:005) http://www.novell.com/linux/security/advisories/2006_05_nfsserver.html Debian Security Advisory (DSA 975-1) http://lists.debian.org/debian-security-announce/debian-security-announce-2006/msg00052.html |
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Version history |
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| Version | Comments | Date |
| 1.0 | Aviso emitido | 2006-01-31 |
| 1.1 | Aviso emitido por Debian (DSA 975-1) | 2006-02-15 |