{"id":"CVE-2026-52817","aliases":["EUVD-2026-61489","GHSA-8w6w-23mq-h8rg","PYSEC-2026-2595"],"status":"published","title":"Linuxfabrik Monitoring Plugins Sudoers: /usr/bin/apt-get arguments allow privilege escalation","description":"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":{"version":"4.0","score":7,"vector":"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","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-11","score":0.0018,"percentile":0.07639,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-88"],"published":"2026-07-02T20:23:56Z","modified":"2026-10-28T02:31:04Z","fixes":[{"ecosystem":"PyPI","package":"linuxfabrik-lib","fixed_in":["5.1.0"],"sources":["ghsa","osv"]}],"affected":[{"source":"ghsa","ecosystem":"PyPI","package":"linuxfabrik-lib","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"last_affected":"5.0.0"},{"fixed":"5.1.0"}]}]},{"source":"osv","ecosystem":"PyPI","package":"linuxfabrik-lib","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.1.0"}]}],"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"]},{"source":"osv","ecosystem":"PyPI","package":"linuxfabrik-lib","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.1.0"}]}],"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"]}],"products":[{"vendor":"linuxfabrik","product":"monitoring-plugins"}],"references":[{"url":"https://github.com/Linuxfabrik/monitoring-plugins/security/advisories/GHSA-8w6w-23mq-h8rg","tags":["x_refsource_CONFIRM","exploit","advisory","web"]},{"url":"https://github.com/Linuxfabrik/monitoring-plugins/commit/694b5daeebadc9a51428f3de1acff7b1f737642f","tags":["x_refsource_MISC","fix"]},{"url":"https://github.com/Linuxfabrik/monitoring-plugins/blob/main/CHANGELOG.md#v510---2026-05-30","tags":["x_refsource_MISC","web"]},{"url":"https://github.com/Linuxfabrik/monitoring-plugins/releases/tag/v5.1.0","tags":["x_refsource_MISC","web"]},{"url":"https://github.com/advisories/GHSA-8w6w-23mq-h8rg","tags":["advisory"]},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/52xxx/CVE-2026-52817.json","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-52817","tags":["advisory"]},{"url":"https://github.com/Linuxfabrik/monitoring-plugins","tags":["package"]},{"url":"https://pypi.org/project/linuxfabrik-lib","tags":["package"]}],"sources":{"cve":[{"id":"CVE-2026-52817","title":"Linuxfabrik Monitoring Plugins Sudoers: /usr/bin/apt-get arguments allow privilege escalation","description":"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.","status":"published","published":"2026-08-18T20:53:22.189Z","modified":"2026-08-19T19:03:29.652Z","cvss":[{"version":"4.0","score":7,"vector":"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","level":"high","assessor":"cna"}],"cwes":["CWE-88"],"updated_at":"2026-11-02T13:40:57.334596Z"}],"euvd":[{"id":"EUVD-2026-61489","description":"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.","status":"published","published":"2026-08-18T20:53:22Z","modified":"2026-08-19T19:03:29Z","cvss":[{"version":"4.0","score":7,"vector":"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","level":"high"}],"updated_at":"2026-11-02T18:01:40.9092Z"}],"ghsa":[{"id":"GHSA-8w6w-23mq-h8rg","title":"Linuxfabrik Monitoring Plugins: Sudoers may be able to obtain privilege escalation via /usr/bin/apt-get arguments","description":"### 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```","status":"published","published":"2026-07-02T20:23:56Z","modified":"2026-07-02T20:23:57Z","cvss":[{"version":"4.0","score":7,"vector":"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","level":"high"}],"cwes":["CWE-88"],"updated_at":"2026-11-02T14:40:38.48196Z"}],"nvd":[{"id":"CVE-2026-52817","description":"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.","status":"published","published":"2026-08-18T21:16:34.82Z","modified":"2026-10-22T22:10:00.25Z","cvss":[{"version":"4.0","score":7,"vector":"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/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"high","assessor":"secondary"}],"cwes":["CWE-88"],"updated_at":"2026-11-02T14:12:38.976695Z"}],"osv":[{"id":"CVE-2026-52817","title":"Linuxfabrik Monitoring Plugins Sudoers: /usr/bin/apt-get arguments allow privilege escalation","description":"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.","status":"published","published":"2026-08-18T20:53:22.189Z","modified":"2026-10-28T02:31:04.199499Z","cvss":[{"version":"4.0","score":7,"vector":"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","level":"high"}],"cwes":["CWE-88"],"updated_at":"2026-11-02T15:45:07.431113Z"},{"id":"GHSA-8w6w-23mq-h8rg","title":"Linuxfabrik Monitoring Plugins: Sudoers may be able to obtain privilege escalation via /usr/bin/apt-get arguments","description":"### 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```","status":"published","published":"2026-07-02T20:23:56Z","modified":"2026-07-13T16:42:32.446708688Z","cvss":[{"version":"4.0","score":7,"vector":"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","level":"high"}],"cwes":["CWE-88"],"updated_at":"2026-11-02T15:46:42.78452Z"},{"id":"PYSEC-2026-2595","title":"Linuxfabrik Monitoring Plugins: Sudoers may be able to obtain privilege escalation via /usr/bin/apt-get arguments","description":"### 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```","status":"published","published":"2026-07-13T15:46:27.499597Z","modified":"2026-07-13T16:32:03.535840022Z","cvss":[{"version":"4.0","score":7,"vector":"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","level":"high"}],"updated_at":"2026-11-02T15:52:55.961245Z"}]}}