153 lines
8.1 KiB
Markdown
153 lines
8.1 KiB
Markdown
---
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description: Checklist for privilege escalation in Linux
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---
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# Checklist - Linux Privilege Escalation
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### **Best tool to look for Linux local privilege escalation vectors:** [**LinPEAS**](https://github.com/carlospolop/privilege-escalation-awesome-scripts-suite/tree/master/linPEAS)\*\*\*\*
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### [System Information](privilege-escalation/#system-information)
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* [ ] Get **OS information**
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* [ ] Check the [**PATH**](privilege-escalation/#path), any **writable folder**?
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* [ ] Check [**env variables**](privilege-escalation/#env-info), any sensitive detail?
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* [ ] Search for [**kernel exploits**](privilege-escalation/#kernel-exploits) **using scripts** \(DirtyCow?\)
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* [ ] **Check** if the [**sudo version** is vulnerable](privilege-escalation/#sudo-version)
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* [ ] \*\*\*\*[**Dmesg** signature verification failed](privilege-escalation/#dmesg-signature-verification-failed) error?
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* [ ] More system enum \([date, system stats, cpu info, printers](privilege-escalation/#more-system-enumeration)\)
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* [ ] [Enumerate more defenses](privilege-escalation/#enumerate-possible-defenses)
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### [Drives](privilege-escalation/#drives)
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* [ ] **List mounted** drives
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* [ ] **Any unmounted drive?**
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* [ ] **Any creds in fstab?**
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### \*\*\*\*[**Installed Software**](privilege-escalation/#installed-software)\*\*\*\*
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1. [ ] **Check for**[ **useful software**](privilege-escalation/#useful-software) **installed**
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2. [ ] **Check for** [**vulnerable software**](privilege-escalation/#vulnerable-software-installed) **installed**
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### \*\*\*\*[Processes](privilege-escalation/#processes)
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* [ ] Is any **unknown software running**?
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* [ ] Is any software with **more privileges that it should have running**?
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* [ ] Search for **exploits for running processes** \(specially if running of versions\)
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* [ ] Can you **modify the binary** of any running process?
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* [ ] **Monitor processes** and check if any interesting process is running frequently
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* [ ] Can you **read** some interesting **process memory** \(where passwords could be saved\)?
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### [Scheduled/Cron jobs?](privilege-escalation/#scheduled-jobs)
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* [ ] Is the [**PATH** ](privilege-escalation/#cron-path)being modified by some cron and you can **write** in it?
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* [ ] Any [**wildcard** ](privilege-escalation/#cron-using-a-script-with-a-wildcard-wildcard-injection)in a cron job?
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* [ ] Some [**modifiable script** ](privilege-escalation/#cron-script-overwriting-and-symlink)is being **executed** or is inside **modifiable folder**?
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* [ ] Have you detected that some **script** could be being [**executed** very **frequently**](privilege-escalation/#frequent-cron-jobs)? \(every 1, 2 or 5 minutes\)
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### [Services](privilege-escalation/#services)
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* [ ] Any **writable .service** file?
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* [ ] Any **writable binary** executed by a **service**?
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* [ ] Any **writable folder in systemd PATH**?
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### [Timers](privilege-escalation/#timers)
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* [ ] Any **writable timer**?
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### [Sockets](privilege-escalation/#sockets)
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* [ ] Any **writable .socket** file?
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* [ ] Can you **communicate with any socket**?
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* [ ] **HTTP sockets** with interesting info?
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### [D-Bus](privilege-escalation/#d-bus)
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* [ ] Can you **communicate with any D-Bus**?
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### [Network](privilege-escalation/#network)
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* [ ] Enumerate the network to know where you are
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* [ ] **Open ports you couldn't access before** getting a shell inside the machine?
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* [ ] Can you **sniff traffic** using `tcpdump`?
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### [Users](privilege-escalation/#users)
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* [ ] Generic users/groups **enumeration**
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* [ ] Do you have a **very big UID**? Is the **machine** **vulnerable**?
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* [ ] Can you [**escalate privileges thanks to a group**](privilege-escalation/interesting-groups-linux-pe/) you belong to?
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* [ ] **Clipboard** data?
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* [ ] Password Policy?
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* [ ] Try to **use** every **known password** that you have discovered previously to login **with each** possible **user**. Try to login also without password.
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### [Writable PATH](privilege-escalation/#writable-path-abuses)
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* [ ] If you have **write privileges over some folder in PATH** you may be able to escalate privileges
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### [SUDO and SUID commands](privilege-escalation/#sudo-and-suid)
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* [ ] Can you execute **any comand with sudo**? Can you use it to READ, WRITE or EXECUTE anything as root? \([**GTFOBins**](https://gtfobins.github.io/)\)
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* [ ] Is any **exploitable suid binary**? \([**GTFOBins**](https://gtfobins.github.io/)\)
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* [ ] Are [**sudo** commands **limited** by **path**? can you **bypass** the restrictions](privilege-escalation/#sudo-execution-bypassing-paths)?
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* [ ] \*\*\*\*[**Sudo/SUID binary without path indicated**](privilege-escalation/#sudo-command-suid-binary-without-command-path)?
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* [ ] \*\*\*\*[**SUID binary specifying path**](privilege-escalation/#suid-binary-with-command-path)? Bypass
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* [ ] \*\*\*\*[**LD\_PRELOAD vuln**](privilege-escalation/#ld_preload)\*\*\*\*
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* [ ] \*\*\*\*[**Lack of .so library in SUID binary**](privilege-escalation/#suid-binary-so-injection) ****from a writable folder?
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* [ ] \*\*\*\*[**SUDO tokens available**](privilege-escalation/#reusing-sudo-tokens)? [**Can you create a SUDO token**](privilege-escalation/#var-run-sudo-ts-less-than-username-greater-than)?
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* [ ] Can you [**read or modify sudoers files**](privilege-escalation/#etc-sudoers-etc-sudoers-d)?
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* [ ] Can you [**modify /etc/ld.so.conf.d/**](privilege-escalation/#etc-ld-so-conf-d)?
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* [ ] [**OpenBSD DOAS**](privilege-escalation/#doas) ****command
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### [Capabilities](privilege-escalation/#capabilities)
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* [ ] Has any binary any **unexpected capability**?
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### [ACLs](privilege-escalation/#acls)
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* [ ] Has any file any **unexpected ACL**?
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### [Open Shell sessions](privilege-escalation/#open-shell-sessions)
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* [ ] **screen**?
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* [ ] **tmux**?
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### [SSH](privilege-escalation/#ssh)
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* [ ] **Debian** [**OpenSSL Predictable PRNG - CVE-2008-0166**](privilege-escalation/#debian-openssl-predictable-prng-cve-2008-0166)\*\*\*\*
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* [ ] \*\*\*\*[**SSH Interesting configuration values**](privilege-escalation/#ssh-interesting-configuration-values)\*\*\*\*
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### [Interesting Files](privilege-escalation/#interesting-files)
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* [ ] **Profile files** - Read sensitive data? Write to privesc?
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* [ ] **passwd/shadow files** - Read sensitive data? Write to privesc?
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* [ ] **Check commonly interesting folders** for sensitive data
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* [ ] **Weird Localtion/Owned files,** you may have access or alter executable files
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* [ ] **Modified** in last mins
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* [ ] **Sqlite DB files**
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* [ ] **Hidden files**
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* [ ] **Script/Binaries in PATH**
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* [ ] **Web files** \(passwords?\)
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* [ ] **Backups**?
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* [ ] **Known files that contains passwords**: Use **Linpeas** and **LaZagne**
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* [ ] **Generic search**
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### \*\*\*\*[**Writable Files**](privilege-escalation/#writable-files)\*\*\*\*
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* [ ] **Modify python library** to execute arbitrary commands?
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* [ ] Can you **modify log files**? **Logtotten** exploit
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* [ ] Can you **modify /etc/sysconfig/network-scripts/**? Centos/Redhat exploit
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* [ ] Can you [**write in ini, int.d, systemd or rc.d files**](privilege-escalation/#init-init-d-systemd-and-rc-d)?
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### \*\*\*\*[**Other tricks**](privilege-escalation/#other-tricks)\*\*\*\*
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* [ ] Can you [**abuse NFS to escalate privileges**](privilege-escalation/#nfs-privilege-escalation)?
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* [ ] Do you need to [**escape from a restrictive shell**](privilege-escalation/#escaping-from-restricted-shells)?
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If you want to **know** about my **latest modifications**/**additions** or you have **any suggestion for HackTricks or PEASS**, ****join the [💬](https://emojipedia.org/speech-balloon/) ****[**PEASS & HackTricks telegram group here**](https://t.me/peass), or **follow me on Twitter** [🐦](https://emojipedia.org/bird/)[**@carlospolopm**](https://twitter.com/carlospolopm)**.**
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If you want to **share some tricks with the community** you can also submit **pull requests** to ****[**https://github.com/carlospolop/hacktricks**](https://github.com/carlospolop/hacktricks) ****that will be reflected in this book.
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Don't forget to **give ⭐ on the github** to motivate me to continue developing this book.
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[**Buy me a coffee here**](https://www.buymeacoffee.com/carlospolop)\*\*\*\*
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