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| - [Checklist - Linux Privilege Escalation](linux-hardening/linux-privilege-escalation-checklist.md) | ||||
| - [Linux Privilege Escalation](linux-hardening/privilege-escalation/README.md) | ||||
|   - [Android Rooting Frameworks Manager Auth Bypass Syscall Hook](linux-hardening/privilege-escalation/android-rooting-frameworks-manager-auth-bypass-syscall-hook.md) | ||||
|   - [Vmware Tools Service Discovery Untrusted Search Path Cve 2025 41244](linux-hardening/privilege-escalation/vmware-tools-service-discovery-untrusted-search-path-cve-2025-41244.md) | ||||
|   - [Arbitrary File Write to Root](linux-hardening/privilege-escalation/write-to-root.md) | ||||
|   - [Cisco - vmanage](linux-hardening/privilege-escalation/cisco-vmanage.md) | ||||
|   - [Containerd (ctr) Privilege Escalation](linux-hardening/privilege-escalation/containerd-ctr-privilege-escalation.md) | ||||
|  | ||||
										
											
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| # VMware Tools service discovery LPE (CWE-426) via regex-based binary discovery (CVE-2025-41244) | ||||
| 
 | ||||
| {{#include ../../banners/hacktricks-training.md}} | ||||
| 
 | ||||
| Questa tecnica sfrutta pipeline di service discovery guidate da regex che analizzano le command line dei processi in esecuzione per dedurre le versioni dei service e quindi eseguire un candidate binary con un flag "version". Quando pattern permissivi accettano percorsi non attendibili controllati dall'attaccante (es. /tmp/httpd), il privileged collector esegue un arbitrary binary da una untrusted location, portando a local privilege escalation. NVISO ha documentato questo in VMware Tools/Aria Operations Service Discovery come CVE-2025-41244. | ||||
| 
 | ||||
| - Impatto: Local privilege escalation a root (o all'account di discovery privilegiato) | ||||
| - Causa: Untrusted Search Path (CWE-426) + permissive regex matching of process command lines | ||||
| - Interessati: open-vm-tools/VMware Tools su Linux (credential-less discovery), VMware Aria Operations SDMP (credential-based discovery via Tools/proxy) | ||||
| 
 | ||||
| ## Come funziona VMware service discovery (panoramica) | ||||
| 
 | ||||
| - Credential-based (legacy): Aria esegue discovery scripts all'interno del guest tramite VMware Tools usando privileged credentials configurate. | ||||
| - Credential-less (modern): La discovery logic gira all'interno di VMware Tools, già privilegiata nel guest. | ||||
| 
 | ||||
| Entrambe le modalità, alla fine, eseguono logica in shell che scansiona i processi con socket in ascolto, estrae un command path corrispondente tramite una regex e esegue il primo token argv con un flag version. | ||||
| 
 | ||||
| ## Causa radice e pattern vulnerabile (open-vm-tools) | ||||
| 
 | ||||
| In open-vm-tools, lo script plugin serviceDiscovery get-versions.sh confronta i candidate binaries usando espressioni regolari ampie e esegue il primo token senza alcuna validazione del trusted-path: | ||||
| ```bash | ||||
| get_version() { | ||||
| PATTERN=$1 | ||||
| VERSION_OPTION=$2 | ||||
| for p in $space_separated_pids | ||||
| do | ||||
| COMMAND=$(get_command_line $p | grep -Eo "$PATTERN") | ||||
| [ ! -z "$COMMAND" ] && echo VERSIONSTART "$p" "$("${COMMAND%%[[:space:]]*}" $VERSION_OPTION 2>&1)" VERSIONEND | ||||
| done | ||||
| } | ||||
| ``` | ||||
| Viene invocato con pattern permissivi contenenti \S (non-whitespace) che andranno facilmente a corrispondere a percorsi non di sistema in posizioni scrivibili dall'utente: | ||||
| ```bash | ||||
| get_version "/\S+/(httpd-prefork|httpd|httpd2-prefork)($|\s)" -v | ||||
| get_version "/usr/(bin|sbin)/apache\S*" -v | ||||
| get_version "/\S+/mysqld($|\s)" -V | ||||
| get_version "\.?/\S*nginx($|\s)" -v | ||||
| get_version "/\S+/srm/bin/vmware-dr($|\s)" --version | ||||
| get_version "/\S+/dataserver($|\s)" -v | ||||
| ``` | ||||
| - L'estrazione usa grep -Eo e prende il primo token: ${COMMAND%%[[:space:]]*} | ||||
| - Nessuna whitelist/allowlist di percorsi di sistema considerati trusted; qualsiasi discovered listener con un nome corrispondente viene eseguito con -v/--version | ||||
| 
 | ||||
| Questo crea una primitive di esecuzione basata su un percorso di ricerca non trusted: binari arbitrari situati in directory world-writable (e.g., /tmp/httpd) vengono eseguiti da un componente privilegiato. | ||||
| 
 | ||||
| ## Sfruttamento (sia in modalità credential-less che credential-based) | ||||
| 
 | ||||
| Preconditions | ||||
| - Puoi eseguire un processo non privilegiato che apre una listening socket sul guest. | ||||
| - Il discovery job è abilitato e gira periodicamente (storicamente ~5 minuti). | ||||
| 
 | ||||
| Steps | ||||
| 1) Stage a binary in a path matching one of the permissive regexes, e.g. /tmp/httpd or ./nginx | ||||
| 2) Eseguilo come utente a basso privilegio e assicurati che apra una qualsiasi listening socket | ||||
| 3) Attendi il ciclo di discovery; il privileged collector eseguirà automaticamente: /tmp/httpd -v (o simile), eseguendo il tuo programma come root | ||||
| 
 | ||||
| Minimal demo (using NVISO’s approach) | ||||
| ```bash | ||||
| # Build any small helper that: | ||||
| #  - default mode: opens a dummy TCP listener | ||||
| #  - when called with -v/--version: performs the privileged action (e.g., connect to an abstract UNIX socket and spawn /bin/sh -i) | ||||
| # Example staging and trigger | ||||
| cp your_helper /tmp/httpd | ||||
| chmod +x /tmp/httpd | ||||
| /tmp/httpd          # run as low-priv user and wait for the cycle | ||||
| # After the next cycle, expect a root shell or your privileged action | ||||
| ``` | ||||
| Tipica catena dei processi | ||||
| - Basato su credenziali: /usr/bin/vmtoolsd -> /bin/sh /tmp/VMware-SDMP-Scripts-.../script_...sh -> /tmp/httpd -v -> /bin/sh -i | ||||
| - Senza credenziali: /bin/sh .../get-versions.sh -> /tmp/httpd -v -> /bin/sh -i | ||||
| 
 | ||||
| Artefatti (basato su credenziali) | ||||
| Gli script wrapper SDMP recuperati sotto /tmp/VMware-SDMP-Scripts-{UUID}/ possono mostrare l'esecuzione diretta del percorso malevolo: | ||||
| ```bash | ||||
| /tmp/httpd -v >"/tmp/VMware-SDMP-Scripts-{UUID}/script_-{ID}_0.stdout" 2>"/tmp/VMware-SDMP-Scripts-{UUID}/script_-{ID}_0.stderr" | ||||
| ``` | ||||
| ## Generalizing the technique: regex-driven discovery abuse (portable pattern) | ||||
| 
 | ||||
| Many agents and monitoring suites implement version/service discovery by: | ||||
| - Enumerating processes with listening sockets | ||||
| - Grepping argv/command lines with permissive regexes (e.g., patterns containing \S) | ||||
| - Executing the matched path with a benign flag like -v, --version, -V, -h | ||||
| 
 | ||||
| If the regex accepts untrusted paths and the path is executed from a privileged context, you get CWE-426 Untrusted Search Path execution. | ||||
| 
 | ||||
| Abuse recipe | ||||
| - Name your binary like common daemons that the regex is likely to match: httpd, nginx, mysqld, dataserver | ||||
| - Place it in a writable directory: /tmp/httpd, ./nginx | ||||
| - Ensure it matches the regex and opens any port to be enumerated | ||||
| - Wait for the scheduled collector; you get an automatic privileged invocation of <path> -v | ||||
| 
 | ||||
| Masquerading note: This aligns with MITRE ATT&CK T1036.005 (Match Legitimate Name or Location) to increase match probability and stealth. | ||||
| 
 | ||||
| Reusable privileged I/O relay trick | ||||
| - Build your helper so that on privileged invocation (-v/--version) it connects to a known rendezvous (e.g., a Linux abstract UNIX socket like @cve) and bridges stdio to /bin/sh -i. This avoids on-disk artifacts and works across many environments where the same binary is re-invoked with a flag. | ||||
| 
 | ||||
| ## Detection and DFIR guidance | ||||
| 
 | ||||
| Hunting queries | ||||
| - Uncommon children of vmtoolsd or get-versions.sh such as /tmp/httpd, ./nginx, /tmp/mysqld | ||||
| - Any execution of non-system absolute paths by discovery scripts (look for spaces in ${COMMAND%%...} expansions) | ||||
| - ps -ef --forest to visualize ancestry trees: vmtoolsd -> get-versions.sh -> <non-system path> | ||||
| 
 | ||||
| On Aria SDMP (credential-based) | ||||
| - Inspect /tmp/VMware-SDMP-Scripts-{UUID}/ for transient scripts and stdout/stderr artifacts showing execution of attacker paths | ||||
| 
 | ||||
| Policy/telemetry | ||||
| - Alert when privileged collectors execute from non-system prefixes: ^/(tmp|home|var/tmp|dev/shm)/ | ||||
| - File integrity monitoring on get-versions.sh and VMware Tools plugins | ||||
| 
 | ||||
| ## Mitigations | ||||
| 
 | ||||
| - Patch: Apply Broadcom/VMware updates for CVE-2025-41244 (Tools and Aria Operations SDMP) | ||||
| - Disable or restrict credential-less discovery where feasible | ||||
| - Validate trusted paths: restrict execution to allowlisted directories (/usr/sbin, /usr/bin, /sbin, /bin) and only exact known binaries | ||||
| - Avoid permissive regexes with \S; prefer anchored, explicit absolute paths and exact command names | ||||
| - Drop privileges for discovery helpers where possible; sandbox (seccomp/AppArmor) to reduce impact | ||||
| - Monitor for and alert on vmtoolsd/get-versions.sh executing non-system paths | ||||
| 
 | ||||
| ## Notes for defenders and implementers | ||||
| 
 | ||||
| Safer matching and execution pattern | ||||
| ```bash | ||||
| # Bad: permissive regex and blind exec | ||||
| COMMAND=$(get_command_line "$pid" | grep -Eo "/\\S+/nginx(\$|\\s)") | ||||
| [ -n "$COMMAND" ] && "${COMMAND%%[[:space:]]*}" -v | ||||
| 
 | ||||
| # Good: strict allowlist + path checks | ||||
| candidate=$(get_command_line "$pid" | awk '{print $1}') | ||||
| case "$candidate" in | ||||
| /usr/sbin/nginx|/usr/sbin/httpd|/usr/sbin/apache2) | ||||
| "$candidate" -v 2>&1 ;; | ||||
| *) | ||||
| : # ignore non-allowlisted paths | ||||
| ;; | ||||
| esac | ||||
| ``` | ||||
| ## Riferimenti | ||||
| 
 | ||||
| - [NVISO – You name it, VMware elevates it (CVE-2025-41244)](https://blog.nviso.eu/2025/09/29/you-name-it-vmware-elevates-it-cve-2025-41244/) | ||||
| - [Broadcom advisory for CVE-2025-41244](https://support.broadcom.com/web/ecx/support-content-notification/-/external/content/SecurityAdvisories/0/36149) | ||||
| - [open-vm-tools – serviceDiscovery/get-versions.sh (stable-13.0.0)](https://github.com/vmware/open-vm-tools/blob/stable-13.0.0/open-vm-tools/services/plugins/serviceDiscovery/get-versions.sh) | ||||
| - [MITRE ATT&CK T1036.005 – Match Legitimate Name or Location](https://attack.mitre.org/techniques/T1036/005/) | ||||
| - [CWE-426: Untrusted Search Path](https://cwe.mitre.org/data/definitions/426.html) | ||||
| 
 | ||||
| {{#include ../../banners/hacktricks-training.md}} | ||||
| @ -1,14 +1,26 @@ | ||||
| # VMware ESX / vCenter Pentesting | ||||
| 
 | ||||
| {{#include ../../banners/hacktricks-training.md}} | ||||
| 
 | ||||
| 
 | ||||
| # Enumerazione | ||||
| ## Enumerazione | ||||
| ```bash | ||||
| nmap -sV --script "http-vmware-path-vuln or vmware-version" -p <PORT> <IP> | ||||
| msf> use auxiliary/scanner/vmware/esx_fingerprint | ||||
| msf> use auxiliary/scanner/http/ms15_034_http_sys_memory_dump | ||||
| ``` | ||||
| # Bruteforce | ||||
| ## Bruteforce | ||||
| ```bash | ||||
| msf> auxiliary/scanner/vmware/vmware_http_login | ||||
| ``` | ||||
| Se trovi credenziali valide, puoi utilizzare ulteriori moduli scanner di metasploit per ottenere informazioni. | ||||
| Se trovi credenziali valide, puoi usare altri moduli scanner di metasploit per ottenere informazioni. | ||||
| 
 | ||||
| ### Vedi anche | ||||
| 
 | ||||
| Linux LPE via VMware Tools service discovery (CWE-426 / CVE-2025-41244): | ||||
| 
 | ||||
| {{#ref}} | ||||
| ../../linux-hardening/privilege-escalation/vmware-tools-service-discovery-untrusted-search-path-cve-2025-41244.md | ||||
| {{#endref}} | ||||
| 
 | ||||
| {{#include ../../banners/hacktricks-training.md}} | ||||
|  | ||||
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