92 lines
2.4 KiB
SQL
92 lines
2.4 KiB
SQL
-- Find processes that run with a lower effective UID than their parent (state-based)
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--
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-- references:
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-- * https://attack.mitre.org/techniques/T1548/001/ (Setuid and Setgid)
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-- * https://cybersecurity.att.com/blogs/labs-research/shikitega-new-stealthy-malware-targeting-linux
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--
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-- related:
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-- * unexpected-privilege-escalation-events.sql
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--
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-- tags: transient state process escalation
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-- platform: linux
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SELECT
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p0.uid AS p0_uid,
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-- Child
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p0.pid AS p0_pid,
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p0.path AS p0_path,
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p0.name AS p0_name,
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p0.cmdline AS p0_cmd,
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p0.cwd AS p0_cwd,
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p0.cgroup_path AS p0_cgroup,
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p0.euid AS p0_euid,
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p0_hash.sha256 AS p0_sha256,
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-- Parent
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p0.parent AS p1_pid,
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p1.path AS p1_path,
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p1.name AS p1_name,
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p1_f.mode AS p1_mode,
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p1.euid AS p1_euid,
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p1.cmdline AS p1_cmd,
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p1_hash.sha256 AS p1_sha256,
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-- Grandparent
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p1.parent AS p2_pid,
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p2.name AS p2_name,
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p2.path AS p2_path,
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p2.cmdline AS p2_cmd,
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p2_hash.sha256 AS p2_sha256
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FROM
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processes p0
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LEFT JOIN hash p0_hash ON p0.path = p0_hash.path
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LEFT JOIN processes p1 ON p0.parent = p1.pid
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LEFT JOIN file p1_f ON p1.path = p1_f.path
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LEFT JOIN hash p1_hash ON p1.path = p1_hash.path
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LEFT JOIN processes p2 ON p1.parent = p2.pid
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LEFT JOIN hash p2_hash ON p2.path = p2_hash.path
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WHERE
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p0.pid IN (
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SELECT
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pid
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FROM
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processes
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WHERE
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euid < uid
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AND NOT path IN (
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'/bin/ps',
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'/opt/1Password/1password',
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'/usr/bin/doas',
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'/usr/bin/fusermount',
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'/usr/bin/fusermount3',
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'/usr/bin/newgrp',
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'/usr/bin/login',
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'/usr/bin/su',
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'/usr/bin/sudo',
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'/usr/bin/top',
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'/usr/libexec/Xorg',
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'/usr/lib/xorg/Xorg'
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) -- doas may be in the process of being upgraded
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AND NOT path LIKE '/nix/store/%/bin/sudo'
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AND NOT path LIKE '/nix/store/%/bin/dhcpcd'
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AND NOT path LIKE '/snap/snapd/%/usr/lib/snapd/snap-confine'
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AND NOT name IN ('doas', 'sudo')
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)
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AND NOT (
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p0.cmdline LIKE '%pacman%'
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AND p1.cmdline LIKE 'yay%'
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)
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AND NOT (
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p0.name = 'polkit-agent-he'
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AND p1.path = '/usr/bin/gnome-shell'
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)
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AND NOT (
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p0.name = 'fusermount3'
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AND p1.path = '/usr/lib/xdg-document-portal'
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)
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AND NOT (
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p0.path = '/usr/bin/pkexec'
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AND p1.path = '/usr/bin/update-notifier'
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)
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AND NOT (
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p0.path = '/usr/libexec/xdg-permission-store'
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AND p1.path = '/usr/lib/systemd/systemd'
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)
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