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CERTFR-2020-AVI-825
Vulnerability from certfr_avis
De multiples vulnérabilités ont a été découvertes dans Citrix Hypervisor. Elles permettent à un attaquant de provoquer un déni de service.
Solution
Se référer au bulletin de sécurité de l'éditeur pour l'obtention des correctifs (cf. section Documentation).
NoneImpacted products
| Vendor | Product | Description | ||
|---|---|---|---|---|
| Citrix | Citrix Hypervisor | Citrix XenServer versions antérieures à 7.1 LTSR CU2 sans les derniers correctifs de sécurité | ||
| Citrix | Citrix Hypervisor | Citrix Hypervisor versions antérieures à 8.1 sans les derniers correctifs de sécurité | ||
| Citrix | Citrix Hypervisor | Citrix XenServer versions antérieures à 7.0 sans les derniers correctifs de sécurité | ||
| Citrix | Citrix Hypervisor | Citrix Hypervisor versions antérieures à 8.2 LTSR sans les derniers correctifs de sécurité |
References
| Title | Publication Time | Tags | |||
|---|---|---|---|---|---|
|
|||||
{
"$ref": "https://www.cert.ssi.gouv.fr/openapi.json",
"affected_systems": [
{
"description": "Citrix XenServer versions ant\u00e9rieures \u00e0 7.1 LTSR CU2 sans les derniers correctifs de s\u00e9curit\u00e9",
"product": {
"name": "Citrix Hypervisor",
"vendor": {
"name": "Citrix",
"scada": false
}
}
},
{
"description": "Citrix Hypervisor versions ant\u00e9rieures \u00e0 8.1 sans les derniers correctifs de s\u00e9curit\u00e9",
"product": {
"name": "Citrix Hypervisor",
"vendor": {
"name": "Citrix",
"scada": false
}
}
},
{
"description": "Citrix XenServer versions ant\u00e9rieures \u00e0 7.0 sans les derniers correctifs de s\u00e9curit\u00e9",
"product": {
"name": "Citrix Hypervisor",
"vendor": {
"name": "Citrix",
"scada": false
}
}
},
{
"description": "Citrix Hypervisor versions ant\u00e9rieures \u00e0 8.2 LTSR sans les derniers correctifs de s\u00e9curit\u00e9",
"product": {
"name": "Citrix Hypervisor",
"vendor": {
"name": "Citrix",
"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-2020-29481",
"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-2020-29570",
"url": "https://www.cve.org/CVERecord?id=CVE-2020-29570"
},
{
"name": "CVE-2020-29487",
"url": "https://www.cve.org/CVERecord?id=CVE-2020-29487"
},
{
"name": "CVE-2020-29486",
"url": "https://www.cve.org/CVERecord?id=CVE-2020-29486"
},
{
"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"
}
],
"initial_release_date": "2020-12-16T00:00:00",
"last_revision_date": "2020-12-16T00:00:00",
"links": [],
"reference": "CERTFR-2020-AVI-825",
"revisions": [
{
"description": "Version initiale",
"revision_date": "2020-12-16T00:00:00.000000"
}
],
"risks": [
{
"description": "D\u00e9ni de service"
}
],
"summary": "De multiples vuln\u00e9rabilit\u00e9s ont a \u00e9t\u00e9 d\u00e9couvertes dans Citrix\nHypervisor. Elles permettent \u00e0 un attaquant de provoquer un d\u00e9ni de\nservice.\n",
"title": "Vuln\u00e9rabilit\u00e9 dans Citrix Hypervisor",
"vendor_advisories": [
{
"published_at": null,
"title": "Bulletin de s\u00e9curit\u00e9 Citrix CTX286756 du 15 d\u00e9cembre 2020",
"url": "https://support.citrix.com/article/CTX286756"
}
]
}
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-2020-29569 (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
| URL | Tags | |||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
||||||||||||||||||||
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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.
References
| URL | Tags | |||||||||||||
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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.
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.
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CVE-2020-29486 (GCVE-0-2020-29486)
Vulnerability from cvelistv5
Published
2020-12-15 18:00
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. Nodes in xenstore have an ownership. In oxenstored, a owner could give a node away. However, node ownership has quota implications. Any guest can run another guest out of quota, or create an unbounded number of nodes owned by dom0, thus running xenstored out of memory A malicious guest administrator can cause a denial of service against a specific guest or against the whole host. 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
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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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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.
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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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