github - ghsa-7945-69h3-wr87

ghsa-7945-69h3-wr87

Vulnerability from github

Published

2022-05-13 01:49

Modified

2022-05-13 01:49

Severity ?

6.5 (Medium) - CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H

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.

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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

Vulnerability from cvelistv5

Published

2018-07-02 17:00

Modified

2024-08-05 08:45

Severity ?

Summary

References

▼	URL	Tags
	https://www.debian.org/security/2018/dsa-4236	vendor-advisory, x_refsource_DEBIAN
	https://support.citrix.com/article/CTX235748	x_refsource_CONFIRM
	https://security.gentoo.org/glsa/201810-06	vendor-advisory, x_refsource_GENTOO
	https://lists.debian.org/debian-lts-announce/2018/11/msg00013.html	mailing-list, x_refsource_MLIST
	http://xenbits.xen.org/xsa/advisory-264.html	x_refsource_CONFIRM
	http://www.securitytracker.com/id/1041201	vdb-entry, x_refsource_SECTRACK
	http://www.openwall.com/lists/oss-security/2018/06/27/10	mailing-list, x_refsource_MLIST
	http://www.securityfocus.com/bid/104570	vdb-entry, x_refsource_BID

Impacted products

▼	Vendor	Product
	n/a	n/a

Show details on NVD website

JSON

To clipboard

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            ],
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          },
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            "url": "https://support.citrix.com/article/CTX235748"
          },
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            "x_refsource_BID"
          ],
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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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