Vulnerability-Lookup

CNVD-2020-73756

Vulnerability from cnvd - Published: 2020-12-24

Title

GNOME Display Manager授权问题漏洞

Description

GNOME Display Manager（GDM）是一款显示管理器。 GNOME Display Manager存在授权问题漏洞，攻击者可利用该漏洞可通过GDM的自动锁屏绕过限制，以达到权限获取的目的。

Severity

中

Patch Name

GNOME Display Manager授权问题漏洞的补丁

Patch Description

GNOME Display Manager（GDM）是一款显示管理器。 GNOME Display Manager存在授权问题漏洞，攻击者可利用该漏洞可通过GDM的自动锁屏绕过限制，以达到权限获取的目的。目前，供应商发布了安全公告及相关补丁信息，修复了此漏洞。

Formal description

厂商已发布了漏洞修复程序，请及时关注更新： https://bugzilla.redhat.com/show_bug.cgi?id=1906812

Reference

https://vigilance.fr/vulnerability/GDM-privilege-escalation-via-Autologin-Lock-Screen-Bypass-34187

Impacted products

Name
Gnome GNOME Display Manager null

Show details on source website

JSON

To clipboard

{
  "cves": {
    "cve": {
      "cveNumber": "CVE-2020-27837",
      "cveUrl": "https://nvd.nist.gov/vuln/detail/CVE-2020-27837"
    }
  },
  "description": "GNOME Display Manager\uff08GDM\uff09\u662f\u4e00\u6b3e\u663e\u793a\u7ba1\u7406\u5668\u3002\n\nGNOME Display Manager\u5b58\u5728\u6388\u6743\u95ee\u9898\u6f0f\u6d1e\uff0c\u653b\u51fb\u8005\u53ef\u5229\u7528\u8be5\u6f0f\u6d1e\u53ef\u901a\u8fc7GDM\u7684\u81ea\u52a8\u9501\u5c4f\u7ed5\u8fc7\u9650\u5236\uff0c\u4ee5\u8fbe\u5230\u6743\u9650\u83b7\u53d6\u7684\u76ee\u7684\u3002",
  "formalWay": "\u5382\u5546\u5df2\u53d1\u5e03\u4e86\u6f0f\u6d1e\u4fee\u590d\u7a0b\u5e8f\uff0c\u8bf7\u53ca\u65f6\u5173\u6ce8\u66f4\u65b0\uff1a\r\nhttps://bugzilla.redhat.com/show_bug.cgi?id=1906812",
  "isEvent": "\u901a\u7528\u8f6f\u786c\u4ef6\u6f0f\u6d1e",
  "number": "CNVD-2020-73756",
  "openTime": "2020-12-24",
  "patchDescription": "GNOME Display Manager\uff08GDM\uff09\u662f\u4e00\u6b3e\u663e\u793a\u7ba1\u7406\u5668\u3002\r\n\r\nGNOME Display Manager\u5b58\u5728\u6388\u6743\u95ee\u9898\u6f0f\u6d1e\uff0c\u653b\u51fb\u8005\u53ef\u5229\u7528\u8be5\u6f0f\u6d1e\u53ef\u901a\u8fc7GDM\u7684\u81ea\u52a8\u9501\u5c4f\u7ed5\u8fc7\u9650\u5236\uff0c\u4ee5\u8fbe\u5230\u6743\u9650\u83b7\u53d6\u7684\u76ee\u7684\u3002\u76ee\u524d\uff0c\u4f9b\u5e94\u5546\u53d1\u5e03\u4e86\u5b89\u5168\u516c\u544a\u53ca\u76f8\u5173\u8865\u4e01\u4fe1\u606f\uff0c\u4fee\u590d\u4e86\u6b64\u6f0f\u6d1e\u3002",
  "patchName": "GNOME Display Manager\u6388\u6743\u95ee\u9898\u6f0f\u6d1e\u7684\u8865\u4e01",
  "products": {
    "product": "Gnome GNOME Display Manager null"
  },
  "referenceLink": "https://vigilance.fr/vulnerability/GDM-privilege-escalation-via-Autologin-Lock-Screen-Bypass-34187",
  "serverity": "\u4e2d",
  "submitTime": "2020-12-23",
  "title": "GNOME Display Manager\u6388\u6743\u95ee\u9898\u6f0f\u6d1e"
}

CVE-2020-27837 (GCVE-0-2020-27837)

Vulnerability from cvelistv5 – Published: 2020-12-28 18:34 – Updated: 2024-08-04 16:25

Summary

A flaw was found in GDM in versions prior to 3.38.2.1. A race condition in the handling of session shutdown makes it possible to bypass the lock screen for a user that has autologin enabled, accessing their session without authentication. This is similar to CVE-2017-12164, but requires more difficult conditions to exploit.

Severity

No CVSS data available.

CWE

CWE-362

Assigner

redhat redhat root

References

1 reference

URL	Tags
https://bugzilla.redhat.com/show_bug.cgi?id=1906812	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
n/a	gdm	Affected: prior to 3.38.2.1

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "providerMetadata": {
          "dateUpdated": "2024-08-04T16:25:43.322Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "tags": [
              "x_refsource_MISC",
              "x_transferred"
            ],
            "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1906812"
          }
        ],
        "title": "CVE Program Container"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "gdm",
          "vendor": "n/a",
          "versions": [
            {
              "status": "affected",
              "version": "prior to 3.38.2.1"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "A flaw was found in GDM in versions prior to 3.38.2.1. A race condition in the handling of session shutdown makes it possible to bypass the lock screen for a user that has autologin enabled, accessing their session without authentication. This is similar to CVE-2017-12164, but requires more difficult conditions to exploit."
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-362",
              "description": "CWE-362",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2020-12-28T18:34:04.000Z",
        "orgId": "53f830b8-0a3f-465b-8143-3b8a9948e749",
        "shortName": "redhat"
      },
      "references": [
        {
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1906812"
        }
      ],
      "x_legacyV4Record": {
        "CVE_data_meta": {
          "ASSIGNER": "secalert@redhat.com",
          "ID": "CVE-2020-27837",
          "STATE": "PUBLIC"
        },
        "affects": {
          "vendor": {
            "vendor_data": [
              {
                "product": {
                  "product_data": [
                    {
                      "product_name": "gdm",
                      "version": {
                        "version_data": [
                          {
                            "version_value": "prior to 3.38.2.1"
                          }
                        ]
                      }
                    }
                  ]
                },
                "vendor_name": "n/a"
              }
            ]
          }
        },
        "data_format": "MITRE",
        "data_type": "CVE",
        "data_version": "4.0",
        "description": {
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              "lang": "eng",
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            }
          ]
        },
        "problemtype": {
          "problemtype_data": [
            {
              "description": [
                {
                  "lang": "eng",
                  "value": "CWE-362"
                }
              ]
            }
          ]
        },
        "references": {
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            {
              "name": "https://bugzilla.redhat.com/show_bug.cgi?id=1906812",
              "refsource": "MISC",
              "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1906812"
            }
          ]
        }
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "53f830b8-0a3f-465b-8143-3b8a9948e749",
    "assignerShortName": "redhat",
    "cveId": "CVE-2020-27837",
    "datePublished": "2020-12-28T18:34:04.000Z",
    "dateReserved": "2020-10-27T00:00:00.000Z",
    "dateUpdated": "2024-08-04T16:25:43.322Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1"
}

Sightings

Author	Source	Type	Date	Other

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.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

CNVD-2020-73756

CVE-2020-27837 (GCVE-0-2020-27837)

Tags

Sightings

Nomenclature

Related by attack behaviour