Vulnerability-Lookup

ubuntu-cve-2020-28049

Vulnerability from osv_ubuntu

Published

2020-11-04 19:15

Modified

2025-10-24 04:48

Summary

Details

An issue was discovered in SDDM before 0.19.0. It incorrectly starts the X server in a way that - for a short time period - allows local unprivileged users to create a connection to the X server without providing proper authentication. A local attacker can thus access X server display contents and, for example, intercept keystrokes or access the clipboard. This is caused by a race condition during Xauthority file creation.

Severity

6.3 (Medium)


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

6.3 (Medium)


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

N/A (UNKNOWN)

low

References

URL

Type

	https://ubuntu.com/security/CVE-2020-28049	REPORT
	https://www.openwall.com/lists/oss-security/2020/…	REPORT
	https://github.com/sddm/sddm/commit/be202f533ab98…	REPORT
	https://bugzilla.suse.com/show_bug.cgi?id=1177201	REPORT
	https://bugzilla.suse.com/show_bug.cgi?id=CVE-202…	REPORT
	https://github.com/sddm/sddm/blob/v0.19.0/ChangeLog	REPORT
	https://github.com/sddm/sddm/releases	REPORT
	https://www.cve.org/CVERecord?id=CVE-2020-28049	REPORT

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "sddm",
            "binary_version": "0.13.0-1ubuntu5"
          },
          {
            "binary_name": "sddm-theme-circles",
            "binary_version": "0.13.0-1ubuntu5"
          },
          {
            "binary_name": "sddm-theme-elarun",
            "binary_version": "0.13.0-1ubuntu5"
          },
          {
            "binary_name": "sddm-theme-maldives",
            "binary_version": "0.13.0-1ubuntu5"
          },
          {
            "binary_name": "sddm-theme-maui",
            "binary_version": "0.13.0-1ubuntu5"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:16.04:LTS",
        "name": "sddm",
        "purl": "pkg:deb/ubuntu/sddm@0.13.0-1ubuntu5?arch=source\u0026distro=xenial"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.11.0-0ubuntu11",
        "0.11.0-0ubuntu12",
        "0.13.0-1ubuntu1",
        "0.13.0-1ubuntu3",
        "0.13.0-1ubuntu4",
        "0.13.0-1ubuntu5"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "sddm",
            "binary_version": "0.17.0-1ubuntu7"
          },
          {
            "binary_name": "sddm-theme-debian-elarun",
            "binary_version": "0.17.0-1ubuntu7"
          },
          {
            "binary_name": "sddm-theme-debian-maui",
            "binary_version": "0.17.0-1ubuntu7"
          },
          {
            "binary_name": "sddm-theme-elarun",
            "binary_version": "0.17.0-1ubuntu7"
          },
          {
            "binary_name": "sddm-theme-maldives",
            "binary_version": "0.17.0-1ubuntu7"
          },
          {
            "binary_name": "sddm-theme-maui",
            "binary_version": "0.17.0-1ubuntu7"
          },
          {
            "binary_name": "sddm-theme-maya",
            "binary_version": "0.17.0-1ubuntu7"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:18.04:LTS",
        "name": "sddm",
        "purl": "pkg:deb/ubuntu/sddm@0.17.0-1ubuntu7?arch=source\u0026distro=bionic"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.14.0-4ubuntu1",
        "0.14.0-4ubuntu2",
        "0.17.0-1ubuntu1",
        "0.17.0-1ubuntu2",
        "0.17.0-1ubuntu3",
        "0.17.0-1ubuntu4",
        "0.17.0-1ubuntu5",
        "0.17.0-1ubuntu6",
        "0.17.0-1ubuntu7"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "sddm",
            "binary_version": "0.18.1-1ubuntu2"
          },
          {
            "binary_name": "sddm-theme-debian-elarun",
            "binary_version": "0.18.1-1ubuntu2"
          },
          {
            "binary_name": "sddm-theme-debian-maui",
            "binary_version": "0.18.1-1ubuntu2"
          },
          {
            "binary_name": "sddm-theme-elarun",
            "binary_version": "0.18.1-1ubuntu2"
          },
          {
            "binary_name": "sddm-theme-maldives",
            "binary_version": "0.18.1-1ubuntu2"
          },
          {
            "binary_name": "sddm-theme-maui",
            "binary_version": "0.18.1-1ubuntu2"
          },
          {
            "binary_name": "sddm-theme-maya",
            "binary_version": "0.18.1-1ubuntu2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:20.04:LTS",
        "name": "sddm",
        "purl": "pkg:deb/ubuntu/sddm@0.18.1-1ubuntu2?arch=source\u0026distro=focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.18.0-1ubuntu2",
        "0.18.1-1ubuntu1",
        "0.18.1-1ubuntu2"
      ]
    }
  ],
  "aliases": [],
  "details": "An issue was discovered in SDDM before 0.19.0. It incorrectly starts the X server in a way that - for a short time period - allows local unprivileged users to create a connection to the X server without providing proper authentication. A local attacker can thus access X server display contents and, for example, intercept keystrokes or access the clipboard. This is caused by a race condition during Xauthority file creation.",
  "id": "UBUNTU-CVE-2020-28049",
  "modified": "2025-10-24T04:48:53Z",
  "published": "2020-11-04T19:15:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2020-28049"
    },
    {
      "type": "REPORT",
      "url": "https://www.openwall.com/lists/oss-security/2020/11/04/2"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/sddm/sddm/commit/be202f533ab98a684c6a007e8d5b4357846bc222"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.suse.com/show_bug.cgi?id=1177201"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.suse.com/show_bug.cgi?id=CVE-2020-28049"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/sddm/sddm/blob/v0.19.0/ChangeLog"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/sddm/sddm/releases"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2020-28049"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "low",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2020-28049"
  ]
}

CVE-2020-28049 (GCVE-0-2020-28049)

Vulnerability from cvelistv5 – Published: 2020-11-04 00:00 – Updated: 2024-10-15 18:10

Summary

Severity

6.3 (Medium)


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

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator (v2.0.3)

CWE

n/a
CWE-362 - Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

Assigner

mitre

References

8 references

URL	Tags
https://github.com/sddm/sddm/releases
https://bugzilla.suse.com/show_bug.cgi?id=CVE-202…
https://github.com/sddm/sddm/blob/v0.19.0/ChangeLog
https://www.debian.org/security/2020/dsa-4783	vendor-advisory
https://lists.debian.org/debian-lts-announce/2020…	mailing-list
http://lists.opensuse.org/opensuse-security-annou…	vendor-advisory
https://lists.fedoraproject.org/archives/list/pac…	vendor-advisory
https://security.gentoo.org/glsa/202402-02	vendor-advisory

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "providerMetadata": {
          "dateUpdated": "2024-08-04T16:33:56.915Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://github.com/sddm/sddm/releases"
          },
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://bugzilla.suse.com/show_bug.cgi?id=CVE-2020-28049"
          },
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://github.com/sddm/sddm/blob/v0.19.0/ChangeLog"
          },
          {
            "name": "DSA-4783",
            "tags": [
              "vendor-advisory",
              "x_transferred"
            ],
            "url": "https://www.debian.org/security/2020/dsa-4783"
          },
          {
            "name": "[debian-lts-announce] 20201106 [SECURITY] [DLA 2436-1] sddm security update",
            "tags": [
              "mailing-list",
              "x_transferred"
            ],
            "url": "https://lists.debian.org/debian-lts-announce/2020/11/msg00009.html"
          },
          {
            "name": "openSUSE-SU-2020:1870",
            "tags": [
              "vendor-advisory",
              "x_transferred"
            ],
            "url": "http://lists.opensuse.org/opensuse-security-announce/2020-11/msg00031.html"
          },
          {
            "name": "FEDORA-2021-7066b95c99",
            "tags": [
              "vendor-advisory",
              "x_transferred"
            ],
            "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/GT3EX5NSQJJAKY63ENSMEDX6NYZLYY3S/"
          },
          {
            "name": "GLSA-202402-02",
            "tags": [
              "vendor-advisory",
              "x_transferred"
            ],
            "url": "https://security.gentoo.org/glsa/202402-02"
          }
        ],
        "title": "CVE Program Container"
      },
      {
        "metrics": [
          {
            "cvssV3_1": {
              "attackComplexity": "HIGH",
              "attackVector": "LOCAL",
              "availabilityImpact": "NONE",
              "baseScore": 6.3,
              "baseSeverity": "MEDIUM",
              "confidentialityImpact": "HIGH",
              "integrityImpact": "HIGH",
              "privilegesRequired": "LOW",
              "scope": "UNCHANGED",
              "userInteraction": "NONE",
              "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N",
              "version": "3.1"
            }
          },
          {
            "other": {
              "content": {
                "id": "CVE-2020-28049",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2024-10-15T17:16:10.736062Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "problemTypes": [
          {
            "descriptions": [
              {
                "cweId": "CWE-362",
                "description": "CWE-362 Concurrent Execution using Shared Resource with Improper Synchronization (\u0027Race Condition\u0027)",
                "lang": "en",
                "type": "CWE"
              }
            ]
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2024-10-15T18:10:25.839Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "n/a",
          "vendor": "n/a",
          "versions": [
            {
              "status": "affected",
              "version": "n/a"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "An issue was discovered in SDDM before 0.19.0. It incorrectly starts the X server in a way that - for a short time period - allows local unprivileged users to create a connection to the X server without providing proper authentication. A local attacker can thus access X server display contents and, for example, intercept keystrokes or access the clipboard. This is caused by a race condition during Xauthority file creation."
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "description": "n/a",
              "lang": "en",
              "type": "text"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2024-02-03T07:06:30.199Z",
        "orgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca",
        "shortName": "mitre"
      },
      "references": [
        {
          "url": "https://github.com/sddm/sddm/releases"
        },
        {
          "url": "https://bugzilla.suse.com/show_bug.cgi?id=CVE-2020-28049"
        },
        {
          "url": "https://github.com/sddm/sddm/blob/v0.19.0/ChangeLog"
        },
        {
          "name": "DSA-4783",
          "tags": [
            "vendor-advisory"
          ],
          "url": "https://www.debian.org/security/2020/dsa-4783"
        },
        {
          "name": "[debian-lts-announce] 20201106 [SECURITY] [DLA 2436-1] sddm security update",
          "tags": [
            "mailing-list"
          ],
          "url": "https://lists.debian.org/debian-lts-announce/2020/11/msg00009.html"
        },
        {
          "name": "openSUSE-SU-2020:1870",
          "tags": [
            "vendor-advisory"
          ],
          "url": "http://lists.opensuse.org/opensuse-security-announce/2020-11/msg00031.html"
        },
        {
          "name": "FEDORA-2021-7066b95c99",
          "tags": [
            "vendor-advisory"
          ],
          "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/GT3EX5NSQJJAKY63ENSMEDX6NYZLYY3S/"
        },
        {
          "name": "GLSA-202402-02",
          "tags": [
            "vendor-advisory"
          ],
          "url": "https://security.gentoo.org/glsa/202402-02"
        }
      ]
    }
  },
  "cveMetadata": {
    "assignerOrgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca",
    "assignerShortName": "mitre",
    "cveId": "CVE-2020-28049",
    "datePublished": "2020-11-04T00:00:00.000Z",
    "dateReserved": "2020-11-02T00:00:00.000Z",
    "dateUpdated": "2024-10-15T18:10:25.839Z",
    "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.

Action not permitted

ubuntu-cve-2020-28049

Vulnerability from osv_ubuntu

CVE-2020-28049 (GCVE-0-2020-28049)

Tags

Sightings

Nomenclature