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The PCI passthrough code improperly uses register data. Code paths in Xen's MSI handling have been identified that act on unsanitized values read back from device hardware registers. While devices strictly compliant with PCI specifications shouldn't be able to affect these registers, experience shows that it's very common for devices to have out-of-spec \"backdoor\" operations that can affect the result of these reads. A not fully trusted guest may be able to crash Xen, leading to a Denial of Service (DoS) for the entire system. Privilege escalation and information leaks cannot be excluded. All versions of Xen supporting PCI passthrough are affected. Only x86 systems are vulnerable. Arm systems are not vulnerable. Only guests with passed through PCI devices may be able to leverage the vulnerability. Only systems passing through devices with out-of-spec (\"backdoor\") functionality can cause issues. Experience shows that such out-of-spec functionality is common; unless you have reason to believe that your device does not have such functionality, it's better to assume that it does."}, {"lang": "es", "value": "Se detect\u00f3 un problema en Xen versiones hasta 4.14.x. El c\u00f3digo pasado a trav\u00e9s de PCI utiliza incorrectamente los datos de registro. Se han identificado rutas de c\u00f3digo en el manejo de MSI de Xen que act\u00faan sobre valores no saneados le\u00eddos de los registros de hardware del dispositivo. Si bien los dispositivos que cumplen estrictamente con las especificaciones PCI no deber\u00edan poder afectar estos registros, la experiencia se\u00f1ala que es muy com\u00fan que los dispositivos tengan operaciones de \"backdoor\" fuera de especificaciones que pueden afectar el resultado de estas lecturas. Un invitado en el que no se conf\u00eda plenamente puede bloquear Xen, conllevando a una denegaci\u00f3n de servicio (DoS) para todo el sistema. Una escalada de 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{"acknowledgement": "Red Hat would like to thank the Xen project for reporting this issue.", "bugzilla": {"description": "xen: PCI passthrough code reading back hardware registers (XSA-337)", "id": "1877369", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1877369"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.0", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:L/I:L/A:H", "status": "draft"}, "cwe": "CWE-20", "details": ["An issue was discovered in Xen through 4.14.x. The PCI passthrough code improperly uses register data. Code paths in Xen's MSI handling have been identified that act on unsanitized values read back from device hardware registers. While devices strictly compliant with PCI specifications shouldn't be able to affect these registers, experience shows that it's very common for devices to have out-of-spec \"backdoor\" operations that can affect the result of these reads. A not fully trusted guest may be able to crash Xen, leading to a Denial of Service (DoS) for the entire system. Privilege escalation and information leaks cannot be excluded. All versions of Xen supporting PCI passthrough are affected. Only x86 systems are vulnerable. Arm systems are not vulnerable. Only guests with passed through PCI devices may be able to leverage the vulnerability. Only systems passing through devices with out-of-spec (\"backdoor\") functionality can cause issues. Experience shows that such out-of-spec functionality is common; unless you have reason to believe that your device does not have such functionality, it's better to assume that it does.", "A flaw was found in Xen. Code paths in Xen's MSI handling have been identified which act on unsanitized values read back from device hardware registers. A guest that is not fully trusted may be able to crash Xen, leading to a denial of service (DoS) for the entire system. Privilege escalation and information leaks cannot be excluded. The highest threat from this vulnerability is to system availability."], "mitigation": {"lang": "en:us", "value": "Avoid pass-through of physical devices to untrusted guests."}, "name": "CVE-2020-25595", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:5", "fix_state": "Out of support scope", "package_name": "kernel-xen", "product_name": "Red Hat Enterprise Linux 5"}], "public_date": "2020-09-22T12:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2020-25595\nhttps://nvd.nist.gov/vuln/detail/CVE-2020-25595\nhttps://xenbits.xen.org/xsa/advisory-337.html"], "statement": "Only guests with passed-through PCI devices may be able to leverage this vulnerability. Additionally, only x86 systems are vulnerable. ARM systems are not affected by this flaw.\nThis flaw has been rated as having a security impact of Moderate, and is not currently planned to be addressed in future updates of Red Hat Enterprise Linux 5. Red Hat Enterprise Linux 5 is now in Extended Life Phase of the support and maintenance life cycle. For additional information, refer to the Red Hat Enterprise Linux Life Cycle: https://access.redhat.com/support/policy/updates/errata/.", "threat_severity": "Moderate"}