github - ghsa-7945-69h3-wr87

GHSA-7945-69H3-WR87

Vulnerability from github – Published: 2022-05-13 01:49 – Updated: 2022-05-13 01:49

Details

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 ?

6.5 (Medium)


                  
                    CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H

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{
  "affected": [],
  "aliases": [
    "CVE-2018-12891"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2018-07-02T17:29:00Z",
    "severity": "MODERATE"
  },
  "details": "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.",
  "id": "GHSA-7945-69h3-wr87",
  "modified": "2022-05-13T01:49:40Z",
  "published": "2022-05-13T01:49:40Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2018-12891"
    },
    {
      "type": "WEB",
      "url": "https://lists.debian.org/debian-lts-announce/2018/11/msg00013.html"
    },
    {
      "type": "WEB",
      "url": "https://security.gentoo.org/glsa/201810-06"
    },
    {
      "type": "WEB",
      "url": "https://support.citrix.com/article/CTX235748"
    },
    {
      "type": "WEB",
      "url": "https://www.debian.org/security/2018/dsa-4236"
    },
    {
      "type": "WEB",
      "url": "http://www.openwall.com/lists/oss-security/2018/06/27/10"
    },
    {
      "type": "WEB",
      "url": "http://www.securityfocus.com/bid/104570"
    },
    {
      "type": "WEB",
      "url": "http://www.securitytracker.com/id/1041201"
    },
    {
      "type": "WEB",
      "url": "http://xenbits.xen.org/xsa/advisory-264.html"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}

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

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

Summary

Severity ?

No CVSS data available.

CWE

Assigner

mitre

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

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Sightings

Author	Source	Type	Date

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.

Action not permitted

GHSA-7945-69H3-WR87

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

Tags

Sightings

Nomenclature