fkie_cve-2020-25603
Vulnerability from fkie_nvd
Published
2020-09-23 22:15
Modified
2024-11-21 05:18
Severity ?
Summary
An issue was discovered in Xen through 4.14.x. There are missing memory barriers when accessing/allocating an event channel. Event channels control structures can be accessed lockless as long as the port is considered to be valid. Such a sequence is missing an appropriate memory barrier (e.g., smp_*mb()) to prevent both the compiler and CPU from re-ordering access. A malicious guest may be able to cause a hypervisor crash resulting in a Denial of Service (DoS). Information leak and privilege escalation cannot be excluded. Systems running all versions of Xen are affected. Whether a system is vulnerable will depend on the CPU and compiler used to build Xen. For all systems, the presence and the scope of the vulnerability depend on the precise re-ordering performed by the compiler used to build Xen. We have not been able to survey compilers; consequently we cannot say which compiler(s) might produce vulnerable code (with which code generation options). GCC documentation clearly suggests that re-ordering is possible. Arm systems will also be vulnerable if the CPU is able to re-order memory access. Please consult your CPU vendor. x86 systems are only vulnerable if a compiler performs re-ordering.
References
Impacted products
| Vendor | Product | Version | |
|---|---|---|---|
| xen | xen | * | |
| fedoraproject | fedora | 31 | |
| fedoraproject | fedora | 32 | |
| fedoraproject | fedora | 33 | |
| opensuse | leap | 15.2 | |
| debian | debian_linux | 10.0 |
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"value": "An issue was discovered in Xen through 4.14.x. There are missing memory barriers when accessing/allocating an event channel. Event channels control structures can be accessed lockless as long as the port is considered to be valid. Such a sequence is missing an appropriate memory barrier (e.g., smp_*mb()) to prevent both the compiler and CPU from re-ordering access. A malicious guest may be able to cause a hypervisor crash resulting in a Denial of Service (DoS). Information leak and privilege escalation cannot be excluded. Systems running all versions of Xen are affected. Whether a system is vulnerable will depend on the CPU and compiler used to build Xen. For all systems, the presence and the scope of the vulnerability depend on the precise re-ordering performed by the compiler used to build Xen. We have not been able to survey compilers; consequently we cannot say which compiler(s) might produce vulnerable code (with which code generation options). GCC documentation clearly suggests that re-ordering is possible. Arm systems will also be vulnerable if the CPU is able to re-order memory access. Please consult your CPU vendor. x86 systems are only vulnerable if a compiler performs re-ordering."
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"value": "Se detect\u00f3 un problema en Xen versiones hasta 4.14.x.\u0026#xa0;Se presenta una carencia de barreras de memoria al acceder y asignar un canal de eventos.\u0026#xa0;Las estructuras de control de canales de eventos pueden ser accedidas sin lock siempre que el puerto se considere v\u00e1lido.\u0026#xa0;A dicha secuencia le falta una barrera de memoria adecuada (por ejemplo, smp_* mb()) para evitar que tanto el compilador como la CPU reordenen el acceso.\u0026#xa0;Un invitado malicioso puede causar un bloqueo del hypervisor que resulte en una Denegaci\u00f3n de Servicio (DoS).\u0026#xa0;Un filtrado de informaci\u00f3n y una escalada de privilegios no puede ser excluidas.\u0026#xa0;Los sistemas que ejecutan todas las versiones de Xen est\u00e1n afectados.\u0026#xa0;La vulnerabilidad de un sistema depender\u00e1 de la CPU y el compilador usados para construir Xen.\u0026#xa0;Para todos los sistemas, la presencia y el alcance de la vulnerabilidad dependen del reordenamiento preciso realizado por el compilador utilizado para compilar Xen.\u0026#xa0;No hemos podido encuestar a los compiladores;\u0026#xa0;en consecuencia, no podemos decir qu\u00e9 compilador (es) podr\u00edan producir c\u00f3digo vulnerable (con cuales opciones de generaci\u00f3n de c\u00f3digo).\u0026#xa0;La documentaci\u00f3n de GCC sugiere claramente que el reordenamiento es posible.\u0026#xa0;Los sistemas Arm tambi\u00e9n ser\u00e1n vulnerables si la CPU puede reordenar el acceso a la memoria.\u0026#xa0;Consulte a su proveedor de CPU.\u0026#xa0;Los sistemas x86 solo son vulnerables si un compilador realiza un reordenamiento."
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"id": "CVE-2020-25603",
"lastModified": "2024-11-21T05:18:12.883",
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.
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