CVSS: 7.8EPSS: 78%CPEs: 6EXPL: 0CVE-2016-8858
https://notcve.org/view.php?id=CVE-2016-8858
The kex_input_kexinit function in kex.c in OpenSSH 6.x and 7.x through 7.3 allows remote attackers to cause a denial of service (memory consumption) by sending many duplicate KEXINIT requests. NOTE: a third party reports that "OpenSSH upstream does not consider this as a security issue." ** DISPUTADA ** La función kex_input_kexinit en kex.c en OpenSSH 6.x y 7.x hasta la versión 7.3 permite a atacantes remotos provocar una denegación de servicio (consumo de memoria) enviando muchas peticiones duplicadas KEXINIT. NOTA: un tercero reporta que "OpenSSH upstream no considera esto como un problema de seguridad". • http://cvsweb.openbsd.org/cgi-bin/cvsweb/src/usr.bin/ssh/kex.c.diff?r1=1.126&r2=1.127&f=h http://cvsweb.openbsd.org/cgi-bin/cvsweb/src/usr.bin/ssh/kex.c?rev=1.127&content-type=text/x-cvsweb-markup http://www.openwall.com/lists/oss-security/2016/10/19/3 http://www.openwall.com/lists/oss-security/2016/10/20/1 http://www.securityfocus.com/bid/93776 http://www.securitytracker.com/id/1037057 https://bugzilla.redhat.com/show_bug.cgi?id=1384860 https: • CWE-399: Resource Management Errors •
CVSS: 7.8EPSS: 4%CPEs: 2EXPL: 2CVE-2016-6515 – OpenSSH 7.2 - Denial of Service
https://notcve.org/view.php?id=CVE-2016-6515
The auth_password function in auth-passwd.c in sshd in OpenSSH before 7.3 does not limit password lengths for password authentication, which allows remote attackers to cause a denial of service (crypt CPU consumption) via a long string. La función auth_password en auth-passwd.c en sshd en OpenSSH en versiones anteriores a 7.3 no limita longitudes de contraseña para autenticación de contraseña, lo que permite a atacantes remotos provocar una denegación de servicio (consumo de CPU clave) a través de una cadena larga. It was found that OpenSSH did not limit password lengths for password authentication. A remote unauthenticated attacker could use this flaw to temporarily trigger high CPU consumption in sshd by sending long passwords. • https://www.exploit-db.com/exploits/40888 https://github.com/opsxcq/exploit-CVE-2016-6515 http://openwall.com/lists/oss-security/2016/08/01/2 http://packetstormsecurity.com/files/140070/OpenSSH-7.2-Denial-Of-Service.html http://www.oracle.com/technetwork/security-advisory/cpuoct2017-3236626.html http://www.securityfocus.com/bid/92212 http://www.securitytracker.com/id/1036487 https://access.redhat.com/errata/RHSA-2017:2029 https://cert-portal.siemens.com/productcert/pdf/ssa-412672& • CWE-20: Improper Input Validation CWE-770: Allocation of Resources Without Limits or Throttling •
CVSS: 5.9EPSS: 10%CPEs: 1EXPL: 5CVE-2016-6210 – OpenSSH 7.2p2 - Username Enumeration
https://notcve.org/view.php?id=CVE-2016-6210
sshd in OpenSSH before 7.3, when SHA256 or SHA512 are used for user password hashing, uses BLOWFISH hashing on a static password when the username does not exist, which allows remote attackers to enumerate users by leveraging the timing difference between responses when a large password is provided. sshd en OpenSSH en versiones anteriores a 7.3, cuando SHA256 o SHA512 son utilizados para el hashing de la contraseña del usuario, utiliza BLOWFISH hashing en una contraseña estática cuando no existe el nombre de usuario, lo que permite a atacantes remotos enumerar usuarios aprovechando la diferencia de tiempo entre respuestas cuando se proporciona una contraseña grande. A covert timing channel flaw was found in the way OpenSSH handled authentication of non-existent users. A remote unauthenticated attacker could possibly use this flaw to determine valid user names by measuring the timing of server responses. • https://www.exploit-db.com/exploits/40136 https://www.exploit-db.com/exploits/40113 https://github.com/justlce/CVE-2016-6210-Exploit https://github.com/goomdan/CVE-2016-6210-exploit https://github.com/samh4cks/CVE-2016-6210-OpenSSH-User-Enumeration http://seclists.org/fulldisclosure/2016/Jul/51 http://www.debian.org/security/2016/dsa-3626 http://www.securityfocus.com/bid/91812 http://www.securitytracker.com/id/1036319 https://access.redhat.com/errata/RHSA-2017:2029 https&# • CWE-200: Exposure of Sensitive Information to an Unauthorized Actor CWE-385: Covert Timing Channel •
CVSS: 7.8EPSS: 0%CPEs: 8EXPL: 0CVE-2015-8325 – openssh: privilege escalation via user's PAM environment and UseLogin=yes
https://notcve.org/view.php?id=CVE-2015-8325
The do_setup_env function in session.c in sshd in OpenSSH through 7.2p2, when the UseLogin feature is enabled and PAM is configured to read .pam_environment files in user home directories, allows local users to gain privileges by triggering a crafted environment for the /bin/login program, as demonstrated by an LD_PRELOAD environment variable. La función do_setup_env en session.c en sshd en OpenSSH hasta la versión 7.2p2, cuando la funcionalidad UseLogin está activa y PAM está configurado para leer archivos .pam_environment en directorios home de usuario, permite a usuarios locales obtener privilegios desencadenando un entorno manipulado para el programa /bin/login, según lo demostrado por una variable de entorno LD_PRELOAD. It was discovered that the OpenSSH sshd daemon fetched PAM environment settings before running the login program. In configurations with UseLogin=yes and the pam_env PAM module configured to read user environment settings, a local user could use this flaw to execute arbitrary code as root. • http://rhn.redhat.com/errata/RHSA-2016-2588.html http://rhn.redhat.com/errata/RHSA-2017-0641.html http://www.debian.org/security/2016/dsa-3550 http://www.securityfocus.com/bid/86187 http://www.securitytracker.com/id/1036487 https://anongit.mindrot.org/openssh.git/commit/?id=85bdcd7c92fe7ff133bbc4e10a65c91810f88755 https://bugzilla.redhat.com/show_bug.cgi?id=1328012 https://cert-portal.siemens.com/productcert/pdf/ssa-412672.pdf https://people.canonical.com/~ubuntu-security/cve/2015&#x • CWE-264: Permissions, Privileges, and Access Controls CWE-863: Incorrect Authorization •
CVSS: 9.8EPSS: 0%CPEs: 25EXPL: 0CVE-2016-1908 – openssh: possible fallback from untrusted to trusted X11 forwarding
https://notcve.org/view.php?id=CVE-2016-1908
The client in OpenSSH before 7.2 mishandles failed cookie generation for untrusted X11 forwarding and relies on the local X11 server for access-control decisions, which allows remote X11 clients to trigger a fallback and obtain trusted X11 forwarding privileges by leveraging configuration issues on this X11 server, as demonstrated by lack of the SECURITY extension on this X11 server. El cliente en OpenSSH en versiones anteriores a 7.2 no maneja correctamente falló en la generación de cookies para el reenvío X11 no confiable y confía en el servidor X11 local para las decisiones de control de acceso, lo que permite a los clientes remotos X11 activar un fallback y obtener privilegios de reenvío X11 confiables aprovechando los problemas de configuración de este servidor X11, como lo demuestra la falta de la extensión SECURITY en este servidor X11. An access flaw was discovered in OpenSSH; the OpenSSH client did not correctly handle failures to generate authentication cookies for untrusted X11 forwarding. A malicious or compromised remote X application could possibly use this flaw to establish a trusted connection to the local X server, even if only untrusted X11 forwarding was requested. • http://openwall.com/lists/oss-security/2016/01/15/13 http://rhn.redhat.com/errata/RHSA-2016-0465.html http://rhn.redhat.com/errata/RHSA-2016-0741.html http://www.openssh.com/txt/release-7.2 http://www.oracle.com/technetwork/topics/security/linuxbulletinapr2016-2952096.html http://www.securityfocus.com/bid/84427 http://www.securitytracker.com/id/1034705 https://anongit.mindrot.org/openssh.git/commit/?id=ed4ce82dbfa8a3a3c8ea6fa0db113c71e234416c https://bugzilla.redhat.com/show_bug.cgi • CWE-284: Improper Access Control CWE-287: Improper Authentication •