Vulnerability Bulletins |
Denegación de Servicio en lshd |
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Vulnerability classification |
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| Property | Value |
| Confidence level | Oficial |
| Impact | Denegación de Servicio |
| Dificulty | Experto |
| Required attacker level | Acceso remoto con cuenta |
System information |
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| Property | Value |
| Affected manufacturer | GNU/Linux |
| Affected software | lsh 2.0.1 |
Description |
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Se ha descubierto una vulnerabilidad en el servidor de SSHv2 Lshd versión 2.0.1. La vulnerabilidad reside en que el servidor revela descriptores de ficheros relacionados con el generador de números aleatorios. Un atacante local podría causar una denegación de servicio y posiblemente llegar a obtener las claves de sesión. |
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Solution |
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Después de aplicar este parche debería borrar manualmente el fichero semilla del servidor (/var/spool/lsh/yarrow-seed-file) y regenerarla con el comando "lsh-make-seed --server" como root. Por razones de seguridad se debe ejecutar este comando de forma local, si se debe hacer de forma remota se recomienda instalar lsh en otra máquina generar el fichero semilla de forma local y enviarla al servidor remoto usando una conexión segura. Actualización de software Debian Debian Linux 3.1 Source http://security.debian.org/pool/updates/main/l/lsh-utils/lsh-utils_2.0.1-3sarge1.dsc http://security.debian.org/pool/updates/main/l/lsh-utils/lsh-utils_2.0.1-3sarge1.diff.gz http://security.debian.org/pool/updates/main/l/lsh-utils/lsh-utils_2.0.1.orig.tar.gz Architecture independent http://security.debian.org/pool/updates/main/l/lsh-utils/lsh-utils-doc_2.0.1-3sarge1_all.deb Alpha http://security.debian.org/pool/updates/main/l/lsh-utils/lsh-client_2.0.1-3sarge1_alpha.deb http://security.debian.org/pool/updates/main/l/lsh-utils/lsh-server_2.0.1-3sarge1_alpha.deb http://security.debian.org/pool/updates/main/l/lsh-utils/lsh-utils_2.0.1-3sarge1_alpha.deb ARM http://security.debian.org/pool/updates/main/l/lsh-utils/lsh-client_2.0.1-3sarge1_arm.deb http://security.debian.org/pool/updates/main/l/lsh-utils/lsh-server_2.0.1-3sarge1_arm.deb http://security.debian.org/pool/updates/main/l/lsh-utils/lsh-utils_2.0.1-3sarge1_arm.deb Intel IA-32 http://security.debian.org/pool/updates/main/l/lsh-utils/lsh-client_2.0.1-3sarge1_i386.deb http://security.debian.org/pool/updates/main/l/lsh-utils/lsh-server_2.0.1-3sarge1_i386.deb http://security.debian.org/pool/updates/main/l/lsh-utils/lsh-utils_2.0.1-3sarge1_i386.deb Intel IA-64 http://security.debian.org/pool/updates/main/l/lsh-utils/lsh-client_2.0.1-3sarge1_ia64.deb http://security.debian.org/pool/updates/main/l/lsh-utils/lsh-server_2.0.1-3sarge1_ia64.deb http://security.debian.org/pool/updates/main/l/lsh-utils/lsh-utils_2.0.1-3sarge1_ia64.deb HP Precision http://security.debian.org/pool/updates/main/l/lsh-utils/lsh-client_2.0.1-3sarge1_hppa.deb http://security.debian.org/pool/updates/main/l/lsh-utils/lsh-server_2.0.1-3sarge1_hppa.deb http://security.debian.org/pool/updates/main/l/lsh-utils/lsh-utils_2.0.1-3sarge1_hppa.deb Motorola 680x0 http://security.debian.org/pool/updates/main/l/lsh-utils/lsh-client_2.0.1-3sarge1_m68k.deb http://security.debian.org/pool/updates/main/l/lsh-utils/lsh-server_2.0.1-3sarge1_m68k.deb http://security.debian.org/pool/updates/main/l/lsh-utils/lsh-utils_2.0.1-3sarge1_m68k.deb Big endian MIPS http://security.debian.org/pool/updates/main/l/lsh-utils/lsh-client_2.0.1-3sarge1_mips.deb http://security.debian.org/pool/updates/main/l/lsh-utils/lsh-server_2.0.1-3sarge1_mips.deb http://security.debian.org/pool/updates/main/l/lsh-utils/lsh-utils_2.0.1-3sarge1_mips.deb Little endian MIPS http://security.debian.org/pool/updates/main/l/lsh-utils/lsh-client_2.0.1-3sarge1_mipsel.deb http://security.debian.org/pool/updates/main/l/lsh-utils/lsh-server_2.0.1-3sarge1_mipsel.deb http://security.debian.org/pool/updates/main/l/lsh-utils/lsh-utils_2.0.1-3sarge1_mipsel.deb PowerPC http://security.debian.org/pool/updates/main/l/lsh-utils/lsh-client_2.0.1-3sarge1_powerpc.deb http://security.debian.org/pool/updates/main/l/lsh-utils/lsh-server_2.0.1-3sarge1_powerpc.deb http://security.debian.org/pool/updates/main/l/lsh-utils/lsh-utils_2.0.1-3sarge1_powerpc.deb IBM S/390 http://security.debian.org/pool/updates/main/l/lsh-utils/lsh-client_2.0.1-3sarge1_s390.deb http://security.debian.org/pool/updates/main/l/lsh-utils/lsh-server_2.0.1-3sarge1_s390.deb http://security.debian.org/pool/updates/main/l/lsh-utils/lsh-utils_2.0.1-3sarge1_s390.deb Sun Sparc http://security.debian.org/pool/updates/main/l/lsh-utils/lsh-client_2.0.1-3sarge1_sparc.deb http://security.debian.org/pool/updates/main/l/lsh-utils/lsh-server_2.0.1-3sarge1_sparc.deb http://security.debian.org/pool/updates/main/l/lsh-utils/lsh-utils_2.0.1-3sarge1_sparc.deb |
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Standar resources |
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| Property | Value |
| CVE | CVE-2006-0353 |
| BID | |
Other resources |
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Debian Security Advisory (DSA 956-1) http://lists.debian.org/debian-security-announce/debian-security-announce-2006/msg00030.html |
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Version history |
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| Version | Comments | Date |
| 1.0 | Aviso emitido | 2006-01-26 |