FKIE_CVE-2020-25601

Vulnerability from fkie_nvd - Published: 2020-09-23 22:15 - Updated: 2024-11-21 05:18
Severity ?
5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Summary
An issue was discovered in Xen through 4.14.x. There is a lack of preemption in evtchn_reset() / evtchn_destroy(). In particular, the FIFO event channel model allows guests to have a large number of event channels active at a time. Closing all of these (when resetting all event channels or when cleaning up after the guest) may take extended periods of time. So far, there was no arrangement for preemption at suitable intervals, allowing a CPU to spend an almost unbounded amount of time in the processing of these operations. Malicious or buggy guest kernels can mount a Denial of Service (DoS) attack affecting the entire system. All Xen versions are vulnerable in principle. Whether versions 4.3 and older are vulnerable depends on underlying hardware characteristics.
References
cve@mitre.orghttp://lists.opensuse.org/opensuse-security-announce/2020-10/msg00008.htmlMailing List, Third Party Advisory
cve@mitre.orghttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/4JRXMKEMQRQYWYEPHVBIWUEAVQ3LU4FN/
cve@mitre.orghttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/DA633Y3G5KX7MKRN4PFEGM3IVTJMBEOM/
cve@mitre.orghttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RJZERRBJN6E6STDCHT4JHP4MI6TKBCJE/
cve@mitre.orghttps://security.gentoo.org/glsa/202011-06Third Party Advisory
cve@mitre.orghttps://www.debian.org/security/2020/dsa-4769Third Party Advisory
cve@mitre.orghttps://xenbits.xen.org/xsa/advisory-344.htmlVendor Advisory
af854a3a-2127-422b-91ae-364da2661108http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00008.htmlMailing List, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/4JRXMKEMQRQYWYEPHVBIWUEAVQ3LU4FN/
af854a3a-2127-422b-91ae-364da2661108https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/DA633Y3G5KX7MKRN4PFEGM3IVTJMBEOM/
af854a3a-2127-422b-91ae-364da2661108https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RJZERRBJN6E6STDCHT4JHP4MI6TKBCJE/
af854a3a-2127-422b-91ae-364da2661108https://security.gentoo.org/glsa/202011-06Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://www.debian.org/security/2020/dsa-4769Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://xenbits.xen.org/xsa/advisory-344.htmlVendor Advisory
Impacted products
Vendor Product Version
xen xen *
debian debian_linux 10.0
fedoraproject fedora 31
fedoraproject fedora 32
fedoraproject fedora 33
opensuse leap 15.2
To clipboard 

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  "cveTags": [],
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      "lang": "en",
      "value": "An issue was discovered in Xen through 4.14.x. There is a lack of preemption in evtchn_reset() / evtchn_destroy(). In particular, the FIFO event channel model allows guests to have a large number of event channels active at a time. Closing all of these (when resetting all event channels or when cleaning up after the guest) may take extended periods of time. So far, there was no arrangement for preemption at suitable intervals, allowing a CPU to spend an almost unbounded amount of time in the processing of these operations. Malicious or buggy guest kernels can mount a Denial of Service (DoS) attack affecting the entire system. All Xen versions are vulnerable in principle. Whether versions 4.3 and older are vulnerable depends on underlying hardware characteristics."
    },
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      "value": "Se detect\u00f3 un problema en Xen versiones hasta 4.14.x.\u0026#xa0;Se presenta una carencia de preferencia en evtchn_reset() / evtchn_destroy().\u0026#xa0;En particular, el modelo de canal de eventos FIFO permite a los invitados tener una gran cantidad de canales de eventos activos simult\u00e1neos.\u0026#xa0;Cerrar todos estos (al restablecer todos los canales de eventos o al limpiar despu\u00e9s del invitado) puede llevar per\u00edodos de tiempo prolongados.\u0026#xa0;Hasta ahora, no hab\u00eda ning\u00fan arreglo para la preferencia a intervalos adecuados, lo que permit\u00eda que una CPU pasara una cantidad de tiempo casi ilimitada en el procesamiento de estas operaciones.\u0026#xa0;Los kernels invitados maliciosos o con errores pueden montar un ataque de denegaci\u00f3n de servicio (DoS) afectando a todo el sistema.\u0026#xa0;Todas las versiones de Xen son vulnerables en principio.\u0026#xa0;Tanto las versiones 4.3 y como las anteriores son vulnerables dependiendo de las caracter\u00edsticas subyacentes del hardware."
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  "id": "CVE-2020-25601",
  "lastModified": "2024-11-21T05:18:12.487",
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          "accessVector": "LOCAL",
          "authentication": "NONE",
          "availabilityImpact": "COMPLETE",
          "baseScore": 4.9,
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "vectorString": "AV:L/AC:L/Au:N/C:N/I:N/A:C",
          "version": "2.0"
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        "exploitabilityScore": 3.9,
        "impactScore": 6.9,
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