github - ghsa-mw9v-9fv9-jf3f

GHSA-MW9V-9FV9-JF3F

Vulnerability from github – Published: 2022-05-24 17:02 – Updated: 2022-05-24 17:02

Details

An issue was discovered in Xen through 4.12.x allowing attackers to gain host OS privileges via DMA in a situation where an untrusted domain has access to a physical device (and assignable-add is not used), because of an incomplete fix for CVE-2019-18424. XSA-302 relies on the use of libxl's "assignable-add" feature to prepare devices to be assigned to untrusted guests. Unfortunately, this is not considered a strictly required step for device assignment. The PCI passthrough documentation on the wiki describes alternate ways of preparing devices for assignment, and libvirt uses its own ways as well. Hosts where these "alternate" methods are used will still leave the system in a vulnerable state after the device comes back from a guest. An untrusted domain with access to a physical device can DMA into host memory, leading to privilege escalation. Only systems where guests are given direct access to physical devices capable of DMA (PCI pass-through) are vulnerable. Systems which do not use PCI pass-through are not vulnerable.

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{
  "affected": [],
  "aliases": [
    "CVE-2019-19579"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2019-12-04T22:15:00Z",
    "severity": "HIGH"
  },
  "details": "An issue was discovered in Xen through 4.12.x allowing attackers to gain host OS privileges via DMA in a situation where an untrusted domain has access to a physical device (and assignable-add is not used), because of an incomplete fix for CVE-2019-18424. XSA-302 relies on the use of libxl\u0027s \"assignable-add\" feature to prepare devices to be assigned to untrusted guests. Unfortunately, this is not considered a strictly required step for device assignment. The PCI passthrough documentation on the wiki describes alternate ways of preparing devices for assignment, and libvirt uses its own ways as well. Hosts where these \"alternate\" methods are used will still leave the system in a vulnerable state after the device comes back from a guest. An untrusted domain with access to a physical device can DMA into host memory, leading to privilege escalation. Only systems where guests are given direct access to physical devices capable of DMA (PCI pass-through) are vulnerable. Systems which do not use PCI pass-through are not vulnerable.",
  "id": "GHSA-mw9v-9fv9-jf3f",
  "modified": "2022-05-24T17:02:41Z",
  "published": "2022-05-24T17:02:41Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2019-19579"
    },
    {
      "type": "WEB",
      "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/RJYT5FNGM7JSVHHW6B22TSAATBOAPFPD"
    },
    {
      "type": "WEB",
      "url": "https://seclists.org/bugtraq/2020/Jan/21"
    },
    {
      "type": "WEB",
      "url": "https://www.debian.org/security/2020/dsa-4602"
    },
    {
      "type": "WEB",
      "url": "https://www.openwall.com/lists/oss-security/2019/11/26/2"
    },
    {
      "type": "WEB",
      "url": "https://xenbits.xen.org/xsa/advisory-306.html"
    },
    {
      "type": "WEB",
      "url": "http://lists.opensuse.org/opensuse-security-announce/2020-01/msg00011.html"
    },
    {
      "type": "WEB",
      "url": "http://www.openwall.com/lists/oss-security/2019/12/05/7"
    },
    {
      "type": "WEB",
      "url": "http://xenbits.xen.org/xsa/advisory-306.html"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

CVE-2019-19579 (GCVE-0-2019-19579)

Vulnerability from cvelistv5 – Published: 2019-12-04 21:03 – Updated: 2024-08-05 02:16

Summary

Severity ?

No CVSS data available.

CWE

Assigner

mitre

References

URL

Tags

	http://xenbits.xen.org/xsa/advisory-306.html	x_refsource_CONFIRM
	https://xenbits.xen.org/xsa/advisory-306.html	x_refsource_MISC
	https://www.openwall.com/lists/oss-security/2019/…	x_refsource_MISC
	http://www.openwall.com/lists/oss-security/2019/12/05/7	mailing-listx_refsource_MLIST
	https://lists.fedoraproject.org/archives/list/pac…	vendor-advisoryx_refsource_FEDORA
	http://lists.opensuse.org/opensuse-security-annou…	vendor-advisoryx_refsource_SUSE
	https://www.debian.org/security/2020/dsa-4602	vendor-advisoryx_refsource_DEBIAN
	https://seclists.org/bugtraq/2020/Jan/21	mailing-listx_refsource_BUGTRAQ

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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-MW9V-9FV9-JF3F

CVE-2019-19579 (GCVE-0-2019-19579)

Tags

Sightings

Nomenclature