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CERTFR-2020-AVI-824
Vulnerability from certfr_avis
De multiples vulnérabilités ont été découvertes dans Xen. Elles permettent à un attaquant de provoquer un déni de service, une atteinte à la confidentialité des données et une élévation de privilèges.
Solution
Se référer au bulletin de sécurité de l'éditeur pour l'obtention des correctifs (cf. section Documentation).
NoneImpacted products
References
{
"$ref": "https://www.cert.ssi.gouv.fr/openapi.json",
"affected_systems": [
{
"description": "Xen toutes versions sans le dernier correctif de s\u00e9curit\u00e9",
"product": {
"name": "Xen",
"vendor": {
"name": "XEN",
"scada": false
}
}
}
],
"affected_systems_content": null,
"content": "## Solution\n\nSe r\u00e9f\u00e9rer au bulletin de s\u00e9curit\u00e9 de l\u0027\u00e9diteur pour l\u0027obtention des\ncorrectifs (cf. section Documentation).\n",
"cves": [
{
"name": "CVE-2020-29482",
"url": "https://www.cve.org/CVERecord?id=CVE-2020-29482"
},
{
"name": "CVE-2020-29480",
"url": "https://www.cve.org/CVERecord?id=CVE-2020-29480"
},
{
"name": "CVE-2020-29571",
"url": "https://www.cve.org/CVERecord?id=CVE-2020-29571"
},
{
"name": "CVE-2020-29481",
"url": "https://www.cve.org/CVERecord?id=CVE-2020-29481"
},
{
"name": "CVE-2020-29569",
"url": "https://www.cve.org/CVERecord?id=CVE-2020-29569"
},
{
"name": "CVE-2020-29568",
"url": "https://www.cve.org/CVERecord?id=CVE-2020-29568"
},
{
"name": "CVE-2020-29483",
"url": "https://www.cve.org/CVERecord?id=CVE-2020-29483"
},
{
"name": "CVE-2020-29570",
"url": "https://www.cve.org/CVERecord?id=CVE-2020-29570"
},
{
"name": "CVE-2020-29484",
"url": "https://www.cve.org/CVERecord?id=CVE-2020-29484"
},
{
"name": "CVE-2020-29487",
"url": "https://www.cve.org/CVERecord?id=CVE-2020-29487"
},
{
"name": "CVE-2020-29567",
"url": "https://www.cve.org/CVERecord?id=CVE-2020-29567"
},
{
"name": "CVE-2020-29479",
"url": "https://www.cve.org/CVERecord?id=CVE-2020-29479"
},
{
"name": "CVE-2020-29485",
"url": "https://www.cve.org/CVERecord?id=CVE-2020-29485"
},
{
"name": "CVE-2020-29566",
"url": "https://www.cve.org/CVERecord?id=CVE-2020-29566"
}
],
"initial_release_date": "2020-12-16T00:00:00",
"last_revision_date": "2020-12-16T00:00:00",
"links": [],
"reference": "CERTFR-2020-AVI-824",
"revisions": [
{
"description": "Version initiale",
"revision_date": "2020-12-16T00:00:00.000000"
}
],
"risks": [
{
"description": "D\u00e9ni de service"
},
{
"description": "Atteinte \u00e0 la confidentialit\u00e9 des donn\u00e9es"
},
{
"description": "\u00c9l\u00e9vation de privil\u00e8ges"
}
],
"summary": "De multiples vuln\u00e9rabilit\u00e9s ont \u00e9t\u00e9 d\u00e9couvertes dans Xen. Elles\npermettent \u00e0 un attaquant de provoquer un d\u00e9ni de service, une atteinte\n\u00e0 la confidentialit\u00e9 des donn\u00e9es et une \u00e9l\u00e9vation de privil\u00e8ges.\n",
"title": "Multiples vuln\u00e9rabilit\u00e9s dans Xen",
"vendor_advisories": [
{
"published_at": null,
"title": "Bulletin de s\u00e9curit\u00e9 Xen 358 du 15 d\u00e9cembre 2020",
"url": "https://xenbits.xen.org/xsa/advisory-358.html"
},
{
"published_at": null,
"title": "Bulletin de s\u00e9curit\u00e9 Xen 323 du 15 d\u00e9cembre 2020",
"url": "https://xenbits.xen.org/xsa/advisory-323.html"
},
{
"published_at": null,
"title": "Bulletin de s\u00e9curit\u00e9 Xen 350 du 15 d\u00e9cembre 2020",
"url": "https://xenbits.xen.org/xsa/advisory-350.html"
},
{
"published_at": null,
"title": "Bulletin de s\u00e9curit\u00e9 Xen 330 du 15 d\u00e9cembre 2020",
"url": "https://xenbits.xen.org/xsa/advisory-330.html"
},
{
"published_at": null,
"title": "Bulletin de s\u00e9curit\u00e9 Xen 354 du 15 d\u00e9cembre 2020",
"url": "https://xenbits.xen.org/xsa/advisory-354.html"
},
{
"published_at": null,
"title": "Bulletin de s\u00e9curit\u00e9 Xen 352 du 15 d\u00e9cembre 2020",
"url": "https://xenbits.xen.org/xsa/advisory-352.html"
},
{
"published_at": null,
"title": "Bulletin de s\u00e9curit\u00e9 Xen 115 du 15 d\u00e9cembre 2020",
"url": "https://xenbits.xen.org/xsa/advisory-115.html"
},
{
"published_at": null,
"title": "Bulletin de s\u00e9curit\u00e9 Xen 353 du 15 d\u00e9cembre 2020",
"url": "https://xenbits.xen.org/xsa/advisory-353.html"
},
{
"published_at": null,
"title": "Bulletin de s\u00e9curit\u00e9 Xen 324 du 15 d\u00e9cembre 2020",
"url": "https://xenbits.xen.org/xsa/advisory-324.html"
},
{
"published_at": null,
"title": "Bulletin de s\u00e9curit\u00e9 Xen 356 du 15 d\u00e9cembre 2020",
"url": "https://xenbits.xen.org/xsa/advisory-356.html"
},
{
"published_at": null,
"title": "Bulletin de s\u00e9curit\u00e9 Xen 322 du 15 d\u00e9cembre 2020",
"url": "https://xenbits.xen.org/xsa/advisory-322.html"
},
{
"published_at": null,
"title": "Bulletin de s\u00e9curit\u00e9 Xen 325 du 15 d\u00e9cembre 2020",
"url": "https://xenbits.xen.org/xsa/advisory-325.html"
},
{
"published_at": null,
"title": "Bulletin de s\u00e9curit\u00e9 Xen 349 du 15 d\u00e9cembre 2020",
"url": "https://xenbits.xen.org/xsa/advisory-349.html"
},
{
"published_at": null,
"title": "Bulletin de s\u00e9curit\u00e9 Xen 348 du 15 d\u00e9cembre 2020",
"url": "https://xenbits.xen.org/xsa/advisory-348.html"
},
{
"published_at": null,
"title": "Bulletin de s\u00e9curit\u00e9 Xen 359 du 15 d\u00e9cembre 2020",
"url": "https://xenbits.xen.org/xsa/advisory-359.html"
}
]
}
CVE-2020-29479 (GCVE-0-2020-29479)
Vulnerability from cvelistv5
Published
2020-12-15 17:06
Modified
2024-08-04 16:55
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- n/a
Summary
An issue was discovered in Xen through 4.14.x. In the Ocaml xenstored implementation, the internal representation of the tree has special cases for the root node, because this node has no parent. Unfortunately, permissions were not checked for certain operations on the root node. Unprivileged guests can get and modify permissions, list, and delete the root node. (Deleting the whole xenstore tree is a host-wide denial of service.) Achieving xenstore write access is also possible. All systems using oxenstored are vulnerable. Building and using oxenstored is the default in the upstream Xen distribution, if the Ocaml compiler is available. Systems using C xenstored are not vulnerable.
References
| URL | Tags | ||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
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CVE-2020-29566 (GCVE-0-2020-29566)
Vulnerability from cvelistv5
Published
2020-12-15 16:49
Modified
2024-08-04 16:55
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- n/a
Summary
An issue was discovered in Xen through 4.14.x. When they require assistance from the device model, x86 HVM guests must be temporarily de-scheduled. The device model will signal Xen when it has completed its operation, via an event channel, so that the relevant vCPU is rescheduled. If the device model were to signal Xen without having actually completed the operation, the de-schedule / re-schedule cycle would repeat. If, in addition, Xen is resignalled very quickly, the re-schedule may occur before the de-schedule was fully complete, triggering a shortcut. This potentially repeating process uses ordinary recursive function calls, and thus could result in a stack overflow. A malicious or buggy stubdomain serving a HVM guest can cause Xen to crash, resulting in a Denial of Service (DoS) to the entire host. Only x86 systems are affected. Arm systems are not affected. Only x86 stubdomains serving HVM guests can exploit the vulnerability.
References
| URL | Tags | ||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
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CVE-2020-29483 (GCVE-0-2020-29483)
Vulnerability from cvelistv5
Published
2020-12-15 17:15
Modified
2024-08-04 16:55
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- n/a
Summary
An issue was discovered in Xen through 4.14.x. Xenstored and guests communicate via a shared memory page using a specific protocol. When a guest violates this protocol, xenstored will drop the connection to that guest. Unfortunately, this is done by just removing the guest from xenstored's internal management, resulting in the same actions as if the guest had been destroyed, including sending an @releaseDomain event. @releaseDomain events do not say that the guest has been removed. All watchers of this event must look at the states of all guests to find the guest that has been removed. When an @releaseDomain is generated due to a domain xenstored protocol violation, because the guest is still running, the watchers will not react. Later, when the guest is actually destroyed, xenstored will no longer have it stored in its internal data base, so no further @releaseDomain event will be sent. This can lead to a zombie domain; memory mappings of that guest's memory will not be removed, due to the missing event. This zombie domain will be cleaned up only after another domain is destroyed, as that will trigger another @releaseDomain event. If the device model of the guest that violated the Xenstore protocol is running in a stub-domain, a use-after-free case could happen in xenstored, after having removed the guest from its internal data base, possibly resulting in a crash of xenstored. A malicious guest can block resources of the host for a period after its own death. Guests with a stub domain device model can eventually crash xenstored, resulting in a more serious denial of service (the prevention of any further domain management operations). Only the C variant of Xenstore is affected; the Ocaml variant is not affected. Only HVM guests with a stubdom device model can cause a serious DoS.
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CVE-2020-29569 (GCVE-0-2020-29569)
Vulnerability from cvelistv5
Published
2020-12-15 17:00
Modified
2024-08-04 16:55
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- n/a
Summary
An issue was discovered in the Linux kernel through 5.10.1, as used with Xen through 4.14.x. The Linux kernel PV block backend expects the kernel thread handler to reset ring->xenblkd to NULL when stopped. However, the handler may not have time to run if the frontend quickly toggles between the states connect and disconnect. As a consequence, the block backend may re-use a pointer after it was freed. A misbehaving guest can trigger a dom0 crash by continuously connecting / disconnecting a block frontend. Privilege escalation and information leaks cannot be ruled out. This only affects systems with a Linux blkback.
References
| URL | Tags | |||||||||||||||||||
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CVE-2020-29570 (GCVE-0-2020-29570)
Vulnerability from cvelistv5
Published
2020-12-15 17:01
Modified
2024-08-04 16:55
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- n/a
Summary
An issue was discovered in Xen through 4.14.x. Recording of the per-vCPU control block mapping maintained by Xen and that of pointers into the control block is reversed. The consumer assumes, seeing the former initialized, that the latter are also ready for use. Malicious or buggy guest kernels can mount a Denial of Service (DoS) attack affecting the entire system.
References
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CVE-2020-29480 (GCVE-0-2020-29480)
Vulnerability from cvelistv5
Published
2020-12-15 17:08
Modified
2024-08-04 16:55
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- n/a
Summary
An issue was discovered in Xen through 4.14.x. Neither xenstore implementation does any permission checks when reporting a xenstore watch event. A guest administrator can watch the root xenstored node, which will cause notifications for every created, modified, and deleted key. A guest administrator can also use the special watches, which will cause a notification every time a domain is created and destroyed. Data may include: number, type, and domids of other VMs; existence and domids of driver domains; numbers of virtual interfaces, block devices, vcpus; existence of virtual framebuffers and their backend style (e.g., existence of VNC service); Xen VM UUIDs for other domains; timing information about domain creation and device setup; and some hints at the backend provisioning of VMs and their devices. The watch events do not contain values stored in xenstore, only key names. A guest administrator can observe non-sensitive domain and device lifecycle events relating to other guests. This information allows some insight into overall system configuration (including the number and general nature of other guests), and configuration of other guests (including the number and general nature of other guests' devices). This information might be commercially interesting or might make other attacks easier. There is not believed to be exposure of sensitive data. Specifically, there is no exposure of VNC passwords, port numbers, pathnames in host and guest filesystems, cryptographic keys, or within-guest data.
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CVE-2020-29485 (GCVE-0-2020-29485)
Vulnerability from cvelistv5
Published
2020-12-15 17:26
Modified
2024-08-04 16:55
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- n/a
Summary
An issue was discovered in Xen 4.6 through 4.14.x. When acting upon a guest XS_RESET_WATCHES request, not all tracking information is freed. A guest can cause unbounded memory usage in oxenstored. This can lead to a system-wide DoS. Only systems using the Ocaml Xenstored implementation are vulnerable. Systems using the C Xenstored implementation are not vulnerable.
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| URL | Tags | |||||||||||||
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CVE-2020-29567 (GCVE-0-2020-29567)
Vulnerability from cvelistv5
Published
2020-12-15 16:50
Modified
2024-08-04 16:55
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- n/a
Summary
An issue was discovered in Xen 4.14.x. When moving IRQs between CPUs to distribute the load of IRQ handling, IRQ vectors are dynamically allocated and de-allocated on the relevant CPUs. De-allocation has to happen when certain constraints are met. If these conditions are not met when first checked, the checking CPU may send an interrupt to itself, in the expectation that this IRQ will be delivered only after the condition preventing the cleanup has cleared. For two specific IRQ vectors, this expectation was violated, resulting in a continuous stream of self-interrupts, which renders the CPU effectively unusable. A domain with a passed through PCI device can cause lockup of a physical CPU, resulting in a Denial of Service (DoS) to the entire host. Only x86 systems are vulnerable. Arm systems are not vulnerable. Only guests with physical PCI devices passed through to them can exploit the vulnerability.
References
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CVE-2020-29571 (GCVE-0-2020-29571)
Vulnerability from cvelistv5
Published
2020-12-15 17:02
Modified
2024-08-04 16:55
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- n/a
Summary
An issue was discovered in Xen through 4.14.x. A bounds check common to most operation time functions specific to FIFO event channels depends on the CPU observing consistent state. While the producer side uses appropriately ordered writes, the consumer side isn't protected against re-ordered reads, and may hence end up de-referencing a NULL pointer. Malicious or buggy guest kernels can mount a Denial of Service (DoS) attack affecting the entire system. Only Arm systems may be vulnerable. Whether a system is vulnerable depends on the specific CPU. x86 systems are not vulnerable.
References
| URL | Tags | ||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
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CVE-2020-29481 (GCVE-0-2020-29481)
Vulnerability from cvelistv5
Published
2020-12-15 17:51
Modified
2024-08-04 16:55
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- n/a
Summary
An issue was discovered in Xen through 4.14.x. Access rights of Xenstore nodes are per domid. Unfortunately, existing granted access rights are not removed when a domain is being destroyed. This means that a new domain created with the same domid will inherit the access rights to Xenstore nodes from the previous domain(s) with the same domid. Because all Xenstore entries of a guest below /local/domain/<domid> are being deleted by Xen tools when a guest is destroyed, only Xenstore entries of other guests still running are affected. For example, a newly created guest domain might be able to read sensitive information that had belonged to a previously existing guest domain. Both Xenstore implementations (C and Ocaml) are vulnerable.
References
| URL | Tags | ||||||||||||||||
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CVE-2020-29568 (GCVE-0-2020-29568)
Vulnerability from cvelistv5
Published
2020-12-15 16:52
Modified
2024-08-04 16:55
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- n/a
Summary
An issue was discovered in Xen through 4.14.x. Some OSes (such as Linux, FreeBSD, and NetBSD) are processing watch events using a single thread. If the events are received faster than the thread is able to handle, they will get queued. As the queue is unbounded, a guest may be able to trigger an OOM in the backend. All systems with a FreeBSD, Linux, or NetBSD (any version) dom0 are vulnerable.
References
| URL | Tags | ||||||||||||||||
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CVE-2020-29484 (GCVE-0-2020-29484)
Vulnerability from cvelistv5
Published
2020-12-15 17:25
Modified
2024-08-04 16:55
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- n/a
Summary
An issue was discovered in Xen through 4.14.x. When a Xenstore watch fires, the xenstore client that registered the watch will receive a Xenstore message containing the path of the modified Xenstore entry that triggered the watch, and the tag that was specified when registering the watch. Any communication with xenstored is done via Xenstore messages, consisting of a message header and the payload. The payload length is limited to 4096 bytes. Any request to xenstored resulting in a response with a payload longer than 4096 bytes will result in an error. When registering a watch, the payload length limit applies to the combined length of the watched path and the specified tag. Because watches for a specific path are also triggered for all nodes below that path, the payload of a watch event message can be longer than the payload needed to register the watch. A malicious guest that registers a watch using a very large tag (i.e., with a registration operation payload length close to the 4096 byte limit) can cause the generation of watch events with a payload length larger than 4096 bytes, by writing to Xenstore entries below the watched path. This will result in an error condition in xenstored. This error can result in a NULL pointer dereference, leading to a crash of xenstored. A malicious guest administrator can cause xenstored to crash, leading to a denial of service. Following a xenstored crash, domains may continue to run, but management operations will be impossible. Only C xenstored is affected, oxenstored is not affected.
References
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CVE-2020-29487 (GCVE-0-2020-29487)
Vulnerability from cvelistv5
Published
2020-12-15 17:30
Modified
2024-08-04 16:55
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- n/a
Summary
An issue was discovered in Xen XAPI before 2020-12-15. Certain xenstore keys provide feedback from the guest, and are therefore watched by toolstack. Specifically, keys are watched by xenopsd, and data are forwarded via RPC through message-switch to xapi. The watching logic in xenopsd sends one RPC update containing all data, any time any single xenstore key is updated, and therefore has O(N^2) time complexity. Furthermore, message-switch retains recent (currently 128) RPC messages for diagnostic purposes, yielding O(M*N) space complexity. The quantity of memory a single guest can monopolise is bounded by xenstored quota, but the quota is fairly large. It is believed to be in excess of 1G per malicious guest. In practice, this manifests as a host denial of service, either through message-switch thrashing against swap, or OOMing entirely, depending on dom0's configuration. (There are no quotas in xenopsd to limit the quantity of keys that result in RPC traffic.) A buggy or malicious guest can cause unreasonable memory usage in dom0, resulting in a host denial of service. All versions of XAPI are vulnerable. Systems that are not using the XAPI toolstack are not vulnerable.
References
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|---|---|---|---|---|---|---|---|---|
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CVE-2020-29482 (GCVE-0-2020-29482)
Vulnerability from cvelistv5
Published
2020-12-15 17:14
Modified
2024-08-04 16:55
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- n/a
Summary
An issue was discovered in Xen through 4.14.x. A guest may access xenstore paths via absolute paths containing a full pathname, or via a relative path, which implicitly includes /local/domain/$DOMID for their own domain id. Management tools must access paths in guests' namespaces, necessarily using absolute paths. oxenstored imposes a pathname limit that is applied solely to the relative or absolute path specified by the client. Therefore, a guest can create paths in its own namespace which are too long for management tools to access. Depending on the toolstack in use, a malicious guest administrator might cause some management tools and debugging operations to fail. For example, a guest administrator can cause "xenstore-ls -r" to fail. However, a guest administrator cannot prevent the host administrator from tearing down the domain. All systems using oxenstored are vulnerable. Building and using oxenstored is the default in the upstream Xen distribution, if the Ocaml compiler is available. Systems using C xenstored are not vulnerable.
References
| URL | Tags | |||||||||||||
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"lang": "eng",
"value": "An issue was discovered in Xen through 4.14.x. A guest may access xenstore paths via absolute paths containing a full pathname, or via a relative path, which implicitly includes /local/domain/$DOMID for their own domain id. Management tools must access paths in guests\u0027 namespaces, necessarily using absolute paths. oxenstored imposes a pathname limit that is applied solely to the relative or absolute path specified by the client. Therefore, a guest can create paths in its own namespace which are too long for management tools to access. Depending on the toolstack in use, a malicious guest administrator might cause some management tools and debugging operations to fail. For example, a guest administrator can cause \"xenstore-ls -r\" to fail. However, a guest administrator cannot prevent the host administrator from tearing down the domain. All systems using oxenstored are vulnerable. Building and using oxenstored is the default in the upstream Xen distribution, if the Ocaml compiler is available. Systems using C xenstored are not vulnerable."
}
]
},
"problemtype": {
"problemtype_data": [
{
"description": [
{
"lang": "eng",
"value": "n/a"
}
]
}
]
},
"references": {
"reference_data": [
{
"name": "https://xenbits.xenproject.org/xsa/advisory-323.html",
"refsource": "MISC",
"url": "https://xenbits.xenproject.org/xsa/advisory-323.html"
},
{
"name": "DSA-4812",
"refsource": "DEBIAN",
"url": "https://www.debian.org/security/2020/dsa-4812"
},
{
"name": "FEDORA-2020-64859a826b",
"refsource": "FEDORA",
"url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/OBLV6L6Q24PPQ2CRFXDX4Q76KU776GKI/"
},
{
"name": "FEDORA-2020-df772b417b",
"refsource": "FEDORA",
"url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/2C6M6S3CIMEBACH6O7V4H2VDANMO6TVA/"
}
]
}
}
}
},
"cveMetadata": {
"assignerOrgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca",
"assignerShortName": "mitre",
"cveId": "CVE-2020-29482",
"datePublished": "2020-12-15T17:14:19",
"dateReserved": "2020-12-03T00:00:00",
"dateUpdated": "2024-08-04T16:55:10.536Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.1"
}
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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.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- 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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