Vulnerability-Lookup

CVE-2025-5689 (GCVE-0-2025-5689)

Vulnerability from cvelistv5 – Published: 2025-06-16 11:37 – Updated: 2025-06-17 17:27

Title

Improper Permission Management in SSH Session Handling

Summary

A flaw was found in the temporary user record that authd uses in the pre-auth NSS. As a result, a user login for the first time will be considered to be part of the root group in the context of that SSH session.

Severity ?

8.5 (High)


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

CWE

CWE-269 - Improper Privilege Management

Assigner

canonical

References

URL

Tags

https://github.com/ubuntu/authd/security/advisori…

Impacted products

	Vendor	Product	Version
	Canonical	authd	Affected: 0.0.0 , ≤ 0.5.4 (semver)

Show details on NVD website

JSON

To clipboard

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      "title": "Improper Permission Management in SSH Session Handling"
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FKIE_CVE-2025-5689

Vulnerability from fkie_nvd - Published: 2025-06-16 12:15 - Updated: 2025-08-26 16:04

Severity ?

8.5 (High) - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:N

Summary

References

	URL	Tags
	security@ubuntu.com	https://github.com/ubuntu/authd/security/advisories/GHSA-g8qw-mgjx-rwjr	Patch, Vendor Advisory

Impacted products

	Vendor	Product	Version
	canonical	authd	*

JSON

To clipboard

{
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:canonical:authd:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "E78F2FC7-C0B5-442C-B297-A13D953FAE25",
              "versionEndExcluding": "0.5.4",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "A flaw was found in the temporary user record that authd uses in the pre-auth NSS. As a result, a user login for the first time will be considered to be part of the root group in the context of that SSH session."
    },
    {
      "lang": "es",
      "value": "Se detect\u00f3 una falla en el registro de usuario temporal que authd utiliza en el NSS previo a la autorizaci\u00f3n. Como resultado, un usuario que inicia sesi\u00f3n por primera vez se considerar\u00e1 parte del grupo root en el contexto de esa sesi\u00f3n SSH."
    }
  ],
  "id": "CVE-2025-5689",
  "lastModified": "2025-08-26T16:04:34.083",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 8.5,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "LOW",
          "privilegesRequired": "LOW",
          "scope": "CHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 3.1,
        "impactScore": 4.7,
        "source": "security@ubuntu.com",
        "type": "Secondary"
      }
    ]
  },
  "published": "2025-06-16T12:15:19.610",
  "references": [
    {
      "source": "security@ubuntu.com",
      "tags": [
        "Patch",
        "Vendor Advisory"
      ],
      "url": "https://github.com/ubuntu/authd/security/advisories/GHSA-g8qw-mgjx-rwjr"
    }
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  "vulnStatus": "Analyzed",
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        {
          "lang": "en",
          "value": "CWE-269"
        }
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      "type": "Secondary"
    }
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}

GHSA-G8QW-MGJX-RWJR

Vulnerability from github – Published: 2025-06-16 16:01 – Updated: 2025-06-17 19:26

Summary

New authd users logging in via SSH are members of the root group

Details

Impact

When an authd user logs in via SSH for the first time (meaning they do not yet exist in the authd user database) and successfully authenticates via the configured broker, the user is considered a member of the root group in the context of that SSH session. This situation may allow the user to read and write files that are accessible by the root group, to which they should not have access. The user does not get root privileges or any capabilities beyond the access granted to the root group.

Preconditions under which this vulnerability affects a system * authd was installed via the PPA. * An OAuth 2.0 application was registered in Microsoft Entra ID or Google IAM, and the respective authd broker was installed (authd-msentraid or authd-google) and configured. * sshd was configured to enable SSH access with authd, i.e.: UsePAM yes KbdInteractiveAuthentication yes * The username is allowed by the ssh_allowed_suffixes option in the broker configuriation. * The user is allowed by the allowed_users option in the broker configuration. * The user successfully authenticates via the authd broker (Entra ID or Google IAM). * The user did not log in locally before.

Patches

Fixed by https://github.com/ubuntu/authd/commit/619ce8e55953b970f1765ddaad565081538151ab

Workarounds

Configure the SSH server to not allow authenticating via authd, for example by setting UsePAM no or KbdInteractiveAuthentication no in the sshd_config (see https://documentation.ubuntu.com/authd/stable/howto/login-ssh/#ssh-configuration).

Severity ?

6.4 (Medium)


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

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "Go",
        "name": "github.com/ubuntu/authd"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.5.4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2025-5689"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-266",
      "CWE-269"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2025-06-16T16:01:10Z",
    "nvd_published_at": "2025-06-16T12:15:19Z",
    "severity": "MODERATE"
  },
  "details": "### Impact\nWhen an authd user logs in via SSH for the first time (meaning they do not yet exist in the authd user database) and successfully authenticates via the configured broker, the user is considered a member of the root group in the context of that SSH session. This situation may allow the user to read and write files that are accessible by the root group, to which they should not have access. The user does not get root privileges or any capabilities beyond the access granted to the root group.\n\n**Preconditions under which this vulnerability affects a system**\n* authd was [installed via the PPA](https://documentation.ubuntu.com/authd/latest/howto/install-authd/#install-authd).\n* An OAuth 2.0 application was registered in Microsoft Entra ID or Google IAM, and the respective authd broker was installed ([authd-msentraid](https://snapcraft.io/authd-msentraid) or [authd-google](https://snapcraft.io/authd-google)) and [configured](https://documentation.ubuntu.com/authd/latest/howto/configure-authd/#broker-configuration).\n* sshd was [configured to enable SSH](https://documentation.ubuntu.com/authd/latest/howto/login-ssh/) access with authd, i.e.:\n  ```\n  UsePAM yes\n  KbdInteractiveAuthentication yes\n  ```\n* The username is allowed by the `ssh_allowed_suffixes` option in the [broker configuriation](https://documentation.ubuntu.com/authd/latest/howto/login-ssh/#broker-configuration).\n* The user is allowed by the [`allowed_users` option in the broker configuration](https://documentation.ubuntu.com/authd/latest/howto/configure-authd/#configure-allowed-users).\n* The user successfully authenticates via the authd broker (Entra ID or Google IAM).\n* The user did not log in locally before.\n\n### Patches\nFixed by https://github.com/ubuntu/authd/commit/619ce8e55953b970f1765ddaad565081538151ab\n\n### Workarounds\nConfigure the SSH server to not allow authenticating via authd, for example by setting `UsePAM no` or `KbdInteractiveAuthentication no` in the `sshd_config` (see https://documentation.ubuntu.com/authd/stable/howto/login-ssh/#ssh-configuration).",
  "id": "GHSA-g8qw-mgjx-rwjr",
  "modified": "2025-06-17T19:26:35Z",
  "published": "2025-06-16T16:01:10Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/ubuntu/authd/security/advisories/GHSA-g8qw-mgjx-rwjr"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-5689"
    },
    {
      "type": "WEB",
      "url": "https://github.com/ubuntu/authd/commit/619ce8e55953b970f1765ddaad565081538151ab"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/ubuntu/authd"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "New authd users logging in via SSH are members of the root group"
}

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

CVE-2025-5689 (GCVE-0-2025-5689)

FKIE_CVE-2025-5689

GHSA-G8QW-MGJX-RWJR

Impact

Patches

Workarounds

Tags

Sightings

Nomenclature