github - ghsa-pv22-mjm8-4f83

ghsa-pv22-mjm8-4f83

Vulnerability from github

Published

2022-05-14 01:14

Modified

2022-05-14 01:14

Severity ?

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

Details

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.

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{
  "affected": [],
  "aliases": [
    "CVE-2018-12892"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-200"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2018-07-02T17:29:00Z",
    "severity": "CRITICAL"
  },
  "details": "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.",
  "id": "GHSA-pv22-mjm8-4f83",
  "modified": "2022-05-14T01:14:36Z",
  "published": "2022-05-14T01:14:36Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2018-12892"
    },
    {
      "type": "WEB",
      "url": "https://security.gentoo.org/glsa/201810-06"
    },
    {
      "type": "WEB",
      "url": "https://www.debian.org/security/2018/dsa-4236"
    },
    {
      "type": "WEB",
      "url": "http://www.openwall.com/lists/oss-security/2018/06/27/12"
    },
    {
      "type": "WEB",
      "url": "http://www.securityfocus.com/bid/104571"
    },
    {
      "type": "WEB",
      "url": "http://www.securitytracker.com/id/1041203"
    },
    {
      "type": "WEB",
      "url": "http://xenbits.xen.org/xsa/advisory-266.html"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

cve-2018-12892

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://security.gentoo.org/glsa/201810-06	vendor-advisory, x_refsource_GENTOO
	http://www.securityfocus.com/bid/104571	vdb-entry, x_refsource_BID
	http://xenbits.xen.org/xsa/advisory-266.html	x_refsource_CONFIRM
	http://www.securitytracker.com/id/1041203	vdb-entry, x_refsource_SECTRACK
	http://www.openwall.com/lists/oss-security/2018/06/27/12	mailing-list, x_refsource_MLIST

Impacted products

▼	Vendor	Product
	n/a	n/a

Show details on NVD website

JSON

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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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