Vulnerability-Lookup

CERTFR-2018-AVI-316

Vulnerability from certfr_avis - Published: - Updated:

De multiples vulnérabilités ont été découvertes dans Xen . Elles permettent à un attaquant de provoquer un déni de service et une atteinte à l'intégrité des données.

Solution

Se référer au bulletin de sécurité de l'éditeur pour l'obtention des correctifs (cf. section Documentation).

None

Impacted products

	Vendor	Product	Description
	XEN	Xen	Xen toutes versions sans le dernier correctif de sécurité

References

Title

Publication Time

CVE-2018-12891 (GCVE-0-2018-12891)

Vulnerability from cvelistv5 – Published: 2018-07-02 17:00 – Updated: 2024-08-05 08:45

Summary

An issue was discovered in Xen through 4.10.x. Certain PV MMU operations may take a long time to process. For that reason Xen explicitly checks for the need to preempt the current vCPU at certain points. A few rarely taken code paths did bypass such checks. By suitably enforcing the conditions through its own page table contents, a malicious guest may cause such bypasses to be used for an unbounded number of iterations. A malicious or buggy PV guest may cause a Denial of Service (DoS) affecting the entire host. Specifically, it may prevent use of a physical CPU for an indeterminate period of time. All Xen versions from 3.4 onwards are vulnerable. Xen versions 3.3 and earlier are vulnerable to an even wider class of attacks, due to them lacking preemption checks altogether in the affected code paths. Only x86 systems are affected. ARM systems are not affected. Only multi-vCPU x86 PV guests can leverage the vulnerability. x86 HVM or PVH guests as well as x86 single-vCPU PV ones cannot leverage the vulnerability.

Severity

No CVSS data available.

CWE

Assigner

mitre

References

8 references

URL	Tags
https://www.debian.org/security/2018/dsa-4236	vendor-advisoryx_refsource_DEBIAN
https://support.citrix.com/article/CTX235748	x_refsource_CONFIRM
https://security.gentoo.org/glsa/201810-06	vendor-advisoryx_refsource_GENTOO
https://lists.debian.org/debian-lts-announce/2018…	mailing-listx_refsource_MLIST
http://xenbits.xen.org/xsa/advisory-264.html	x_refsource_CONFIRM
http://www.securitytracker.com/id/1041201	vdb-entryx_refsource_SECTRACK
http://www.openwall.com/lists/oss-security/2018/0…	mailing-listx_refsource_MLIST
http://www.securityfocus.com/bid/104570	vdb-entryx_refsource_BID

Date Public

2018-06-27 00:00

Show details on NVD website

JSON

To clipboard

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CVE-2018-12892 (GCVE-0-2018-12892)

Vulnerability from cvelistv5 – Published: 2018-07-02 17:00 – Updated: 2024-08-05 08:45

Summary

An issue was discovered in Xen 4.7 through 4.10.x. libxl fails to pass the readonly flag to qemu when setting up a SCSI disk, due to what was probably an erroneous merge conflict resolution. Malicious guest administrators or (in some situations) users may be able to write to supposedly read-only disk images. Only emulated SCSI disks (specified as "sd" in the libxl disk configuration, or an equivalent) are affected. IDE disks ("hd") are not affected (because attempts to make them readonly are rejected). Additionally, CDROM devices (that is, devices specified to be presented to the guest as CDROMs, regardless of the nature of the backing storage on the host) are not affected; they are always read only. Only systems using qemu-xen (rather than qemu-xen-traditional) as the device model version are vulnerable. Only systems using libxl or libxl-based toolstacks are vulnerable. (This includes xl, and libvirt with the libxl driver.) The vulnerability is present in Xen versions 4.7 and later. (In earlier versions, provided that the patch for XSA-142 has been applied, attempts to create read only disks are rejected.) If the host and guest together usually support PVHVM, the issue is exploitable only if the malicious guest administrator has control of the guest kernel or guest kernel command line.

Severity

No CVSS data available.

CWE

Assigner

mitre

References

6 references

URL	Tags
https://www.debian.org/security/2018/dsa-4236	vendor-advisoryx_refsource_DEBIAN
https://security.gentoo.org/glsa/201810-06	vendor-advisoryx_refsource_GENTOO
http://www.securityfocus.com/bid/104571	vdb-entryx_refsource_BID
http://xenbits.xen.org/xsa/advisory-266.html	x_refsource_CONFIRM
http://www.securitytracker.com/id/1041203	vdb-entryx_refsource_SECTRACK
http://www.openwall.com/lists/oss-security/2018/0…	mailing-listx_refsource_MLIST

Date Public

2018-06-27 00:00

Show details on NVD website

JSON

To clipboard

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CVE-2018-12893 (GCVE-0-2018-12893)

Vulnerability from cvelistv5 – Published: 2018-07-02 17:00 – Updated: 2024-08-05 08:45

Summary

An issue was discovered in Xen through 4.10.x. One of the fixes in XSA-260 added some safety checks to help prevent Xen livelocking with debug exceptions. Unfortunately, due to an oversight, at least one of these safety checks can be triggered by a guest. A malicious PV guest can crash Xen, leading to a Denial of Service. All Xen systems which have applied the XSA-260 fix are vulnerable. Only x86 systems are vulnerable. ARM systems are not vulnerable. Only x86 PV guests can exploit the vulnerability. x86 HVM and PVH guests cannot exploit the vulnerability. An attacker needs to be able to control hardware debugging facilities to exploit the vulnerability, but such permissions are typically available to unprivileged users.

Severity

No CVSS data available.

CWE

Assigner

mitre

References

9 references

URL	Tags
http://www.openwall.com/lists/oss-security/2018/0…	mailing-listx_refsource_MLIST
https://www.debian.org/security/2018/dsa-4236	vendor-advisoryx_refsource_DEBIAN
https://support.citrix.com/article/CTX235748	x_refsource_CONFIRM
https://security.gentoo.org/glsa/201810-06	vendor-advisoryx_refsource_GENTOO
https://lists.debian.org/debian-lts-announce/2018…	mailing-listx_refsource_MLIST
https://bugzilla.redhat.com/show_bug.cgi?id=1590979	x_refsource_CONFIRM
http://xenbits.xen.org/xsa/advisory-265.html	x_refsource_CONFIRM
http://www.securityfocus.com/bid/104572	vdb-entryx_refsource_BID
http://www.securitytracker.com/id/1041202	vdb-entryx_refsource_SECTRACK

Date Public

2018-06-13 00:00

Show details on NVD website

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Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.

Action not permitted

CERTFR-2018-AVI-316

Solution

CVE-2018-12891 (GCVE-0-2018-12891)

CVE-2018-12892 (GCVE-0-2018-12892)

CVE-2018-12893 (GCVE-0-2018-12893)

Tags

Sightings

Nomenclature