github - ghsa-45vh-fhgx-cr2p

GHSA-45VH-FHGX-CR2P

Vulnerability from github – Published: 2022-05-24 19:05 – Updated: 2023-08-08 15:31

Details

x86: Speculative vulnerabilities with bare (non-shim) 32-bit PV guests 32-bit x86 PV guest kernels run in ring 1. At the time when Xen was developed, this area of the i386 architecture was rarely used, which is why Xen was able to use it to implement paravirtualisation, Xen's novel approach to virtualization. In AMD64, Xen had to use a different implementation approach, so Xen does not use ring 1 to support 64-bit guests. With the focus now being on 64-bit systems, and the availability of explicit hardware support for virtualization, fixing speculation issues in ring 1 is not a priority for processor companies. Indirect Branch Restricted Speculation (IBRS) is an architectural x86 extension put together to combat speculative execution sidechannel attacks, including Spectre v2. It was retrofitted in microcode to existing CPUs. For more details on Spectre v2, see: http://xenbits.xen.org/xsa/advisory-254.html However, IBRS does not architecturally protect ring 0 from predictions learnt in ring 1. For more details, see: https://software.intel.com/security-software-guidance/deep-dives/deep-dive-indirect-branch-restricted-speculation Similar situations may exist with other mitigations for other kinds of speculative execution attacks. The situation is quite likely to be similar for speculative execution attacks which have yet to be discovered, disclosed, or mitigated.

Severity ?

5.5 (Medium)


                  
                    CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

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{
  "affected": [],
  "aliases": [
    "CVE-2021-28689"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-119"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2021-06-11T15:15:00Z",
    "severity": "MODERATE"
  },
  "details": "x86: Speculative vulnerabilities with bare (non-shim) 32-bit PV guests 32-bit x86 PV guest kernels run in ring 1. At the time when Xen was developed, this area of the i386 architecture was rarely used, which is why Xen was able to use it to implement paravirtualisation, Xen\u0027s novel approach to virtualization. In AMD64, Xen had to use a different implementation approach, so Xen does not use ring 1 to support 64-bit guests. With the focus now being on 64-bit systems, and the availability of explicit hardware support for virtualization, fixing speculation issues in ring 1 is not a priority for processor companies. Indirect Branch Restricted Speculation (IBRS) is an architectural x86 extension put together to combat speculative execution sidechannel attacks, including Spectre v2. It was retrofitted in microcode to existing CPUs. For more details on Spectre v2, see: http://xenbits.xen.org/xsa/advisory-254.html However, IBRS does not architecturally protect ring 0 from predictions learnt in ring 1. For more details, see: https://software.intel.com/security-software-guidance/deep-dives/deep-dive-indirect-branch-restricted-speculation Similar situations may exist with other mitigations for other kinds of speculative execution attacks. The situation is quite likely to be similar for speculative execution attacks which have yet to be discovered, disclosed, or mitigated.",
  "id": "GHSA-45vh-fhgx-cr2p",
  "modified": "2023-08-08T15:31:18Z",
  "published": "2022-05-24T19:05:06Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-28689"
    },
    {
      "type": "WEB",
      "url": "https://xenbits.xenproject.org/xsa/advisory-370.txt"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2021-28689 (GCVE-0-2021-28689)

Vulnerability from cvelistv5 – Published: 2021-06-11 14:53 – Updated: 2024-08-03 21:47

Summary

Severity ?

No CVSS data available.

CWE

unknown

Assigner

XEN

References

URL

Tags

https://xenbits.xenproject.org/xsa/advisory-370.txt

x_refsource_MISC

Impacted products

	Vendor	Product	Version
	Xen	Xen	Unknown: unspecified , < 4.12 (custom)

Credits

{'credit_data': {'description': {'description_data': [{'lang': 'eng', 'value': 'This issue was discovered by Jann Horn of Google Project Zero.'}]}}}

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{
  "containers": {
    "adp": [
      {
        "providerMetadata": {
          "dateUpdated": "2024-08-03T21:47:33.181Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "tags": [
              "x_refsource_MISC",
              "x_transferred"
            ],
            "url": "https://xenbits.xenproject.org/xsa/advisory-370.txt"
          }
        ],
        "title": "CVE Program Container"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "Xen",
          "vendor": "Xen",
          "versions": [
            {
              "lessThan": "4.12",
              "status": "unknown",
              "version": "unspecified",
              "versionType": "custom"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "value": "{\u0027credit_data\u0027: {\u0027description\u0027: {\u0027description_data\u0027: [{\u0027lang\u0027: \u0027eng\u0027, \u0027value\u0027: \u0027This issue was discovered by Jann Horn of Google Project Zero.\u0027}]}}}"
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "x86: Speculative vulnerabilities with bare (non-shim) 32-bit PV guests 32-bit x86 PV guest kernels run in ring 1. At the time when Xen was developed, this area of the i386 architecture was rarely used, which is why Xen was able to use it to implement paravirtualisation, Xen\u0027s novel approach to virtualization. In AMD64, Xen had to use a different implementation approach, so Xen does not use ring 1 to support 64-bit guests. With the focus now being on 64-bit systems, and the availability of explicit hardware support for virtualization, fixing speculation issues in ring 1 is not a priority for processor companies. Indirect Branch Restricted Speculation (IBRS) is an architectural x86 extension put together to combat speculative execution sidechannel attacks, including Spectre v2. It was retrofitted in microcode to existing CPUs. For more details on Spectre v2, see: http://xenbits.xen.org/xsa/advisory-254.html However, IBRS does not architecturally protect ring 0 from predictions learnt in ring 1. For more details, see: https://software.intel.com/security-software-guidance/deep-dives/deep-dive-indirect-branch-restricted-speculation Similar situations may exist with other mitigations for other kinds of speculative execution attacks. The situation is quite likely to be similar for speculative execution attacks which have yet to be discovered, disclosed, or mitigated."
        }
      ],
      "metrics": [
        {
          "other": {
            "content": {
              "description": {
                "description_data": [
                  {
                    "lang": "eng",
                    "value": "A malicious 32-bit guest kernel may be able to mount a Spectre v2 attack\nagainst Xen, despite the presence hardware protections being active.\n\nIt therefore might be able to infer the contents of arbitrary host memory,\nincluding memory assigned to other guests."
                  }
                ]
              }
            },
            "type": "unknown"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "description": "unknown",
              "lang": "en",
              "type": "text"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2021-06-11T14:53:06",
        "orgId": "23aa2041-22e1-471f-9209-9b7396fa234f",
        "shortName": "XEN"
      },
      "references": [
        {
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://xenbits.xenproject.org/xsa/advisory-370.txt"
        }
      ],
      "x_legacyV4Record": {
        "CVE_data_meta": {
          "ASSIGNER": "security@xen.org",
          "ID": "CVE-2021-28689",
          "STATE": "PUBLIC"
        },
        "affects": {
          "vendor": {
            "vendor_data": [
              {
                "product": {
                  "product_data": [
                    {
                      "product_name": "Xen",
                      "version": {
                        "version_data": [
                          {
                            "version_affected": "?\u003c",
                            "version_value": "4.12"
                          }
                        ]
                      }
                    }
                  ]
                },
                "vendor_name": "Xen"
              }
            ]
          }
        },
        "configuration": {
          "configuration_data": {
            "description": {
              "description_data": [
                {
                  "lang": "eng",
                  "value": "Systems running all versions of Xen are affected.\n\nOnly x86 systems are vulnerable, and only CPUs which are potentially\nvulnerable to Spectre v2.  Consult your hardware manufacturer.\n\nThe vulnerability can only be exploited by 32-bit PV guests which are not\nrun in PV-Shim."
                }
              ]
            }
          }
        },
        "credit": {
          "credit_data": {
            "description": {
              "description_data": [
                {
                  "lang": "eng",
                  "value": "This issue was discovered by Jann Horn of Google Project Zero."
                }
              ]
            }
          }
        },
        "data_format": "MITRE",
        "data_type": "CVE",
        "data_version": "4.0",
        "description": {
          "description_data": [
            {
              "lang": "eng",
              "value": "x86: Speculative vulnerabilities with bare (non-shim) 32-bit PV guests 32-bit x86 PV guest kernels run in ring 1. At the time when Xen was developed, this area of the i386 architecture was rarely used, which is why Xen was able to use it to implement paravirtualisation, Xen\u0027s novel approach to virtualization. In AMD64, Xen had to use a different implementation approach, so Xen does not use ring 1 to support 64-bit guests. With the focus now being on 64-bit systems, and the availability of explicit hardware support for virtualization, fixing speculation issues in ring 1 is not a priority for processor companies. Indirect Branch Restricted Speculation (IBRS) is an architectural x86 extension put together to combat speculative execution sidechannel attacks, including Spectre v2. It was retrofitted in microcode to existing CPUs. For more details on Spectre v2, see: http://xenbits.xen.org/xsa/advisory-254.html However, IBRS does not architecturally protect ring 0 from predictions learnt in ring 1. For more details, see: https://software.intel.com/security-software-guidance/deep-dives/deep-dive-indirect-branch-restricted-speculation Similar situations may exist with other mitigations for other kinds of speculative execution attacks. The situation is quite likely to be similar for speculative execution attacks which have yet to be discovered, disclosed, or mitigated."
            }
          ]
        },
        "impact": {
          "impact_data": {
            "description": {
              "description_data": [
                {
                  "lang": "eng",
                  "value": "A malicious 32-bit guest kernel may be able to mount a Spectre v2 attack\nagainst Xen, despite the presence hardware protections being active.\n\nIt therefore might be able to infer the contents of arbitrary host memory,\nincluding memory assigned to other guests."
                }
              ]
            }
          }
        },
        "problemtype": {
          "problemtype_data": [
            {
              "description": [
                {
                  "lang": "eng",
                  "value": "unknown"
                }
              ]
            }
          ]
        },
        "references": {
          "reference_data": [
            {
              "name": "https://xenbits.xenproject.org/xsa/advisory-370.txt",
              "refsource": "MISC",
              "url": "https://xenbits.xenproject.org/xsa/advisory-370.txt"
            }
          ]
        },
        "workaround": {
          "workaround_data": {
            "description": {
              "description_data": [
                {
                  "lang": "eng",
                  "value": "Running 32-bit PV guests under PV-Shim avoids the vulnerability when Spectre v2\nprotections are otherwise enabled on the system.\n\nPV shim is available and fully security-supported in all\nsecurity-supported versions of Xen.  Using shim is the recommended\nconfiguration.\n\nNot running 32-bit PV guests avoids the vulnerability."
                }
              ]
            }
          }
        }
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "23aa2041-22e1-471f-9209-9b7396fa234f",
    "assignerShortName": "XEN",
    "cveId": "CVE-2021-28689",
    "datePublished": "2021-06-11T14:53:06",
    "dateReserved": "2021-03-18T00:00:00",
    "dateUpdated": "2024-08-03T21:47:33.181Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1"
}

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-45VH-FHGX-CR2P

CVE-2021-28689 (GCVE-0-2021-28689)

Tags

Sightings

Nomenclature