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CVSS: 6.5EPSS: 0%CPEs: 8EXPL: 0

OpenVPN versions before 2.3.15 and before 2.4.2 are vulnerable to reachable assertion when packet-ID counter rolls over resulting into Denial of Service of server by authenticated attacker. OpenVPN versiones anteriores a 2.3.15 y anteriores a 2.4.2, son vulnerables a una aserción alcanzable cuando el contador del identificador de paquete se devuelve como resultado de una denegación de servicio del servidor por parte de un atacante autenticado. • http://www.debian.org/security/2017/dsa-3900 http://www.securityfocus.com/bid/98443 http://www.securitytracker.com/id/1038473 https://community.openvpn.net/openvpn/wiki/QuarkslabAndCryptographyEngineerAudits • CWE-617: Reachable Assertion •

CVSS: 5.9EPSS: 0%CPEs: 1EXPL: 0

OpenVPN, when using a 64-bit block cipher, makes it easier for remote attackers to obtain cleartext data via a birthday attack against a long-duration encrypted session, as demonstrated by an HTTP-over-OpenVPN session using Blowfish in CBC mode, aka a "Sweet32" attack. OpenVPN, cuando utiliza un cifrado de bloques de 64 bits, facilita a atacantes remotos obtener datos de texto plano a través de un ataque birthday contra una sesión encriptada de larga duración, como lo demuestra una sesión HTTP-over-OpenVPN usando Blowfish en modo CBC, también conocido como ataque "Sweet32". • http://www-01.ibm.com/support/docview.wss?uid=nas8N1021697 http://www-01.ibm.com/support/docview.wss?uid=swg21991482 http://www-01.ibm.com/support/docview.wss?uid=swg21995039 http://www.securityfocus.com/bid/92631 http://www.securitytracker.com/id/1036695 https://cert-portal.siemens.com/productcert/pdf/ssa-556833.pdf https://community.openvpn.net/openvpn/wiki/SWEET32 https://h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05369403 https://security.gentoo&# • CWE-200: Exposure of Sensitive Information to an Unauthorized Actor CWE-310: Cryptographic Issues •

CVSS: 2.6EPSS: 0%CPEs: 16EXPL: 1

The openvpn_decrypt function in crypto.c in OpenVPN 2.3.0 and earlier, when running in UDP mode, allows remote attackers to obtain sensitive information via a timing attack involving an HMAC comparison function that does not run in constant time and a padding oracle attack on the CBC mode cipher. La función openvpn_decrypt en el archivo crypto.c en OpenVPN versiones 2.3.0 y anteriores, cuando se ejecuta en modo UDP, permite a los atacantes remotos obtener información confidencial por medio de un ataque de sincronización que implica una función de comparación HMAC que no se ejecuta en tiempo constante y un ataque de tipo padding oracle en el cifrado en modo CBC. • http://lists.fedoraproject.org/pipermail/package-announce/2013-May/105568.html http://lists.fedoraproject.org/pipermail/package-announce/2013-May/105609.html http://lists.opensuse.org/opensuse-updates/2013-11/msg00012.html http://lists.opensuse.org/opensuse-updates/2013-11/msg00016.html http://www.mandriva.com/security/advisories?name=MDVSA-2013:167 http://www.openwall.com/lists/oss-security/2013/05/06/6 https://bugs.gentoo.org/show_bug.cgi?id=468756 https://bugzilla.redhat.com/show_ • CWE-200: Exposure of Sensitive Information to an Unauthorized Actor •

CVSS: 4.0EPSS: 1%CPEs: 85EXPL: 0

OpenVPN 2.0.7 and earlier, when configured to use the --management option with an IP that is not 127.0.0.1, uses a cleartext password for TCP sessions to the management interface, which might allow remote attackers to view sensitive information or cause a denial of service. • http://openvpn.net/man.html http://www.osvdb.org/25660 http://www.securityfocus.com/archive/1/432863/100/0/threaded http://www.securityfocus.com/archive/1/432867/100/0/threaded http://www.securityfocus.com/archive/1/433000/100/0/threaded •

CVSS: 9.0EPSS: 0%CPEs: 6EXPL: 0

OpenVPN 2.0 through 2.0.5 allows remote malicious servers to execute arbitrary code on the client by using setenv with the LD_PRELOAD environment variable. • http://openvpn.net/changelog.html http://secunia.com/advisories/19531 http://secunia.com/advisories/19598 http://secunia.com/advisories/19837 http://secunia.com/advisories/19897 http://sourceforge.net/mailarchive/forum.php?thread_id=10093825&forum_id=8482 http://www.debian.org/security/2006/dsa-1045 http://www.mandriva.com/security/advisories?name=MDKSA-2006:069 http://www.novell.com/linux/security/advisories/2006_04_28.html http://www.osreviews.net/reviews/security/openvpn-print& •