Vulnerability-Lookup

CVE-2026-52817 (GCVE-0-2026-52817)

Vulnerability from cvelistv5 – Published: 2026-08-18 20:53 – Updated: 2026-08-19 19:03

Title

Linuxfabrik Monitoring Plugins Sudoers: /usr/bin/apt-get arguments allow privilege escalation

Summary

Linuxfabrik Monitoring Plugins provides monitoring plugins for Icinga, Nagios, and related systems. Prior to version 5.1.0, the shipped assets/sudoers/Debian.sudoers policy allowed the nagios or icinga account to execute /usr/bin/apt-get as root without restricting its arguments. An attacker who already controls that monitoring account can supply the APT::Update::Pre-Invoke option to execute an arbitrary command while apt-get runs with root privileges, resulting in a root shell and complete compromise of the host. The vulnerable rule supports the check-plugins/deb-updates/deb-updates plugin, but it authorized arbitrary apt-get argument sequences rather than only the required apt-get update --quiet 2 command. This issue is fixed in version 5.1.0.

Severity

7 (High)


                        
                          CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P

SSVC

Exploitation: poc Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-08-19 19:03 UTC

CWE

CWE-88 - Improper Neutralization of Argument Delimiters in a Command ('Argument Injection')

Assigner

GitHub_M mitre root Scorecard

References

4 references

URL	Tags
https://github.com/Linuxfabrik/monitoring-plugins…	x_refsource_CONFIRM
https://github.com/Linuxfabrik/monitoring-plugins…	x_refsource_MISC
https://github.com/Linuxfabrik/monitoring-plugins…	x_refsource_MISC
https://github.com/Linuxfabrik/monitoring-plugins…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version	CPE status
Linuxfabrik	monitoring-plugins	Affected: < 5.1.0	guessed

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-52817

Vulnerability from fkie_nvd - Published: 2026-08-18 21:16 - Updated: 2026-09-09 21:13

Severity

7.0 (High) - CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P

Summary

References

	URL	Tags
	security-advisories@github.com	https://github.com/Linuxfabrik/monitoring-plugins/blob/main/CHANGELOG.md#v510---2026-05-30
	security-advisories@github.com	https://github.com/Linuxfabrik/monitoring-plugins/commit/694b5daeebadc9a51428f3de1acff7b1f737642f
	security-advisories@github.com	https://github.com/Linuxfabrik/monitoring-plugins/releases/tag/v5.1.0
	security-advisories@github.com	https://github.com/Linuxfabrik/monitoring-plugins/security/advisories/GHSA-8w6w-23mq-h8rg
	134c704f-9b21-4f2e-91b3-4a467353bcc0	https://github.com/Linuxfabrik/monitoring-plugins/security/advisories/GHSA-8w6w-23mq-h8rg

Impacted products

	Vendor	Product	Version

JSON

To clipboard

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    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/Linuxfabrik/monitoring-plugins/blob/main/CHANGELOG.md#v510---2026-05-30"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/Linuxfabrik/monitoring-plugins/commit/694b5daeebadc9a51428f3de1acff7b1f737642f"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/Linuxfabrik/monitoring-plugins/releases/tag/v5.1.0"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/Linuxfabrik/monitoring-plugins/security/advisories/GHSA-8w6w-23mq-h8rg"
    },
    {
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "url": "https://github.com/Linuxfabrik/monitoring-plugins/security/advisories/GHSA-8w6w-23mq-h8rg"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Deferred",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-88"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Secondary"
    }
  ]
}

GHSA-8W6W-23MQ-H8RG

Vulnerability from github – Published: 2026-07-02 20:23 – Updated: 2026-07-02 20:23

Summary

Linuxfabrik Monitoring Plugins: Sudoers may be able to obtain privilege escalation via /usr/bin/apt-get arguments

Details

Summary

In the Debian.sudoers file, apt-get is allowed for the nagios user. The full command including the arguments are not enforced and can therefore be choosen arbitrarily. This allows to easily get a root shell as the nagios user:

PoC

By choosing a particular argument, you can get (as a nagios user) a root shell:

sudo apt-get update -o APT::Update::Pre-Invoke::="/bin/sh"

Since the nagious user can use sudo to run apt-get as root, the resulting shell is also running as root.

Impact

The vulnerability is a local privilege escalation, impacting users who use the provided sudoers file. It requires that an attacker already compromised the nagios account (which is quite a high barrier to be honest).

Fix

Since only one place where apt-get is currently used (in deb-updates) was found, it should be enough to allow only the specific arguments used there.

Here an example how the line in the sudoers file could look like:

                    /usr/lib64/nagios/plugins/strongswan-connections,\
                    /usr/lib64/nagios/plugins/systemd-unit,\
                    /usr/bin/apt-get update --quiet 2

Severity

7.0 (High)


                  
                    CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 5.0.0"
      },
      "package": {
        "ecosystem": "PyPI",
        "name": "linuxfabrik-lib"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "5.1.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-52817"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-88"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-07-02T20:23:56Z",
    "nvd_published_at": null,
    "severity": "HIGH"
  },
  "details": "### Summary\nIn the [Debian.sudoers](https://github.com/Linuxfabrik/monitoring-plugins/blob/main/assets/sudoers/Debian.sudoers) file, `apt-get` is allowed for the nagios user. The full command including the arguments are not enforced and can therefore be choosen arbitrarily. This allows to easily get a root shell as the nagios user:\n\n### PoC\nBy choosing a particular argument, you can get (as a nagios user) a root shell:\n```\nsudo apt-get update -o APT::Update::Pre-Invoke::=\"/bin/sh\"\n```\nSince the nagious user can use sudo to run apt-get as root, the resulting shell is also running as root.\n\n### Impact\nThe vulnerability is a local privilege escalation, impacting users who use the provided sudoers file. It requires that an attacker already compromised the nagios account (which is quite a high barrier to be honest).\n\n### Fix\nSince only one place where `apt-get` is currently used (in [deb-updates](https://github.com/Linuxfabrik/monitoring-plugins/blob/998302a5fb43e89df1359f4cbb6558f81c96ae4f/check-plugins/deb-updates/deb-updates#L124)) was found, it should be enough to allow only the specific arguments used there.\n\nHere an example how the line in the sudoers file could look like:\n```\n                    /usr/lib64/nagios/plugins/strongswan-connections,\\\n                    /usr/lib64/nagios/plugins/systemd-unit,\\\n                    /usr/bin/apt-get update --quiet 2\n```",
  "id": "GHSA-8w6w-23mq-h8rg",
  "modified": "2026-07-02T20:23:56Z",
  "published": "2026-07-02T20:23:56Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/Linuxfabrik/monitoring-plugins/security/advisories/GHSA-8w6w-23mq-h8rg"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/Linuxfabrik/monitoring-plugins"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Linuxfabrik Monitoring Plugins: Sudoers may be able to obtain privilege escalation via /usr/bin/apt-get arguments"
}

PYSEC-2026-2595

Vulnerability from pysec - Published: 2026-07-13 15:46 - Updated: 2026-07-13 16:04

Details

Summary

PoC

By choosing a particular argument, you can get (as a nagios user) a root shell:

sudo apt-get update -o APT::Update::Pre-Invoke::="/bin/sh"

Since the nagious user can use sudo to run apt-get as root, the resulting shell is also running as root.

Impact

Fix

Since only one place where apt-get is currently used (in deb-updates) was found, it should be enough to allow only the specific arguments used there.

Here an example how the line in the sudoers file could look like:

                    /usr/lib64/nagios/plugins/strongswan-connections,\
                    /usr/lib64/nagios/plugins/systemd-unit,\
                    /usr/bin/apt-get update --quiet 2

Severity

7.0 (High)


                  
                    CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P

Impacted products

Name	purl
linuxfabrik-lib	pkg:pypi/linuxfabrik-lib

Aliases

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "PyPI",
        "name": "linuxfabrik-lib",
        "purl": "pkg:pypi/linuxfabrik-lib"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "5.1.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2.0.0.0",
        "2.0.0.7",
        "2.1.0.0",
        "2.1.0.4",
        "2.1.1.15",
        "2.1.1.5",
        "2.1.1.7",
        "2.2.0",
        "2.2.1",
        "2.3.0",
        "2.4.0",
        "3.0.0",
        "3.1.0",
        "3.1.1",
        "3.2.0",
        "3.3.0",
        "3.4.0",
        "3.4.1",
        "4.0.0",
        "4.0.1",
        "4.0.2",
        "4.1.0",
        "4.2.0",
        "4.3.0",
        "4.4.0",
        "5.0.0"
      ]
    }
  ],
  "aliases": [
    "CVE-2026-52817",
    "GHSA-8w6w-23mq-h8rg"
  ],
  "details": "### Summary\nIn the [Debian.sudoers](https://github.com/Linuxfabrik/monitoring-plugins/blob/main/assets/sudoers/Debian.sudoers) file, `apt-get` is allowed for the nagios user. The full command including the arguments are not enforced and can therefore be choosen arbitrarily. This allows to easily get a root shell as the nagios user:\n\n### PoC\nBy choosing a particular argument, you can get (as a nagios user) a root shell:\n```\nsudo apt-get update -o APT::Update::Pre-Invoke::=\"/bin/sh\"\n```\nSince the nagious user can use sudo to run apt-get as root, the resulting shell is also running as root.\n\n### Impact\nThe vulnerability is a local privilege escalation, impacting users who use the provided sudoers file. It requires that an attacker already compromised the nagios account (which is quite a high barrier to be honest).\n\n### Fix\nSince only one place where `apt-get` is currently used (in [deb-updates](https://github.com/Linuxfabrik/monitoring-plugins/blob/998302a5fb43e89df1359f4cbb6558f81c96ae4f/check-plugins/deb-updates/deb-updates#L124)) was found, it should be enough to allow only the specific arguments used there.\n\nHere an example how the line in the sudoers file could look like:\n```\n                    /usr/lib64/nagios/plugins/strongswan-connections,\\\n                    /usr/lib64/nagios/plugins/systemd-unit,\\\n                    /usr/bin/apt-get update --quiet 2\n```",
  "id": "PYSEC-2026-2595",
  "modified": "2026-07-13T16:04:36.121072Z",
  "published": "2026-07-13T15:46:27.499597Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/Linuxfabrik/monitoring-plugins/security/advisories/GHSA-8w6w-23mq-h8rg"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/Linuxfabrik/monitoring-plugins"
    },
    {
      "type": "PACKAGE",
      "url": "https://pypi.org/project/linuxfabrik-lib"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/advisories/GHSA-8w6w-23mq-h8rg"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-52817"
    }
  ],
  "severity": [
    {
      "score": "CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Linuxfabrik Monitoring Plugins: Sudoers may be able to obtain privilege escalation via /usr/bin/apt-get arguments"
}

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.

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

CVE-2026-52817 (GCVE-0-2026-52817)

FKIE_CVE-2026-52817

GHSA-8W6W-23MQ-H8RG

Summary

PoC

Impact

Fix

PYSEC-2026-2595

Summary

PoC

Impact

Fix

Tags

Sightings

Nomenclature

Related by attack behaviour