143,993 - Pentesting IMAP

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Internetboodskaptoegangprotokol

Die Internetboodskaptoegangprotokol (IMAP) is ontwerp om gebruikers in staat te stel om hul e-posboodskappe van enige plek af te benader, hoofsaaklik deur 'n internetverbinding. In wese word e-posse op 'n bediener gehou eerder as om afgelaai en op 'n individu se persoonlike toestel gestoor te word. Dit beteken dat wanneer 'n e-pos toegang verkry of gelees word, dit direk van die bediener gedoen word. Hierdie vermoë maak dit moontlik om e-posse van meerdere toestelle te kontroleer, wat verseker dat geen boodskappe gemis word ongeag die toestel wat gebruik word nie.

Standaard werk die IMAP-protokol op twee poorte:

• Poort 143 - dit is die standaard IMAP nie-geënkripteerde poort

• Poort 993 - dit is die poort wat jy moet gebruik as jy veilig met IMAP wil verbind

PORT    STATE SERVICE REASON
143/tcp open  imap    syn-ack

Banner gryp

nc -nv <IP> 143
openssl s_client -connect <IP>:993 -quiet

NTLM Auth - Inligtingsontsluiting

As die bediener NTLM-authentisering (Windows) ondersteun, kan jy sensitiewe inligting (weergawe) verkry:

root@kali: telnet example.com 143
* OK The Microsoft Exchange IMAP4 service is ready.
>> a1 AUTHENTICATE NTLM
+
>> TlRMTVNTUAABAAAAB4IIAAAAAAAAAAAAAAAAAAAAAAA=
+ TlRMTVNTUAACAAAACgAKADgAAAAFgooCBqqVKFrKPCMAAAAAAAAAAEgASABCAAAABgOAJQAAAA9JAEkAUwAwADEAAgAKAEkASQBTADAAMQABAAoASQBJAFMAMAAxAAQACgBJAEkAUwAwADEAAwAKAEkASQBTADAAMQAHAAgAHwMI0VPy1QEAAAAA

Of automate dit met nmap plugin imap-ntlm-info.nse

IMAP Bruteforce

Sintaksis

IMAP Opdrag voorbeelde van hier:

Login
A1 LOGIN username password
Values can be quoted to enclose spaces and special characters. A " must then be escape with a \
A1 LOGIN "username" "password"

List Folders/Mailboxes
A1 LIST "" *
A1 LIST INBOX *
A1 LIST "Archive" *

Create new Folder/Mailbox
A1 CREATE INBOX.Archive.2012
A1 CREATE "To Read"

Delete Folder/Mailbox
A1 DELETE INBOX.Archive.2012
A1 DELETE "To Read"

Rename Folder/Mailbox
A1 RENAME "INBOX.One" "INBOX.Two"

List Subscribed Mailboxes
A1 LSUB "" *

Status of Mailbox (There are more flags than the ones listed)
A1 STATUS INBOX (MESSAGES UNSEEN RECENT)

Select a mailbox
A1 SELECT INBOX

List messages
A1 FETCH 1:* (FLAGS)
A1 UID FETCH 1:* (FLAGS)

Retrieve Message Content
A1 FETCH 2 body[text]
A1 FETCH 2 all
A1 UID FETCH 102 (UID RFC822.SIZE BODY.PEEK[])

Close Mailbox
A1 CLOSE

Logout
A1 LOGOUT

Evolusie

apt install evolution

CURL

Basiese navigasie is moontlik met CURL, maar die dokumentasie is lig op besonderhede, so dit word aanbeveel om die bron te kontroleer vir presiese besonderhede.

1. Lys van posbusse (imap opdrag LIST "" "*")

curl -k 'imaps://1.2.3.4/' --user user:pass

2. Lys boodskappe in 'n posbus (imap opdrag SELECT INBOX en dan SEARCH ALL)

curl -k 'imaps://1.2.3.4/INBOX?ALL' --user user:pass

Die resultaat van hierdie soektog is 'n lys van boodskapindekse.

Dit is ook moontlik om meer komplekse soekterme te verskaf. bv. om te soek na konsepte met wagwoord in die e-posliggaam:

curl -k 'imaps://1.2.3.4/Drafts?TEXT password' --user user:pass

'n Goeie oorsig van die soekterme wat moontlik is, is hier geleë.

3. Laai 'n boodskap af (imap opdrag SELECT Drafts en dan FETCH 1 BODY[])

curl -k 'imaps://1.2.3.4/Drafts;MAILINDEX=1' --user user:pass

Die posindeks sal dieselfde indeks wees wat van die soekoperasie teruggegee word.

Dit is ook moontlik om UID (unieke id) te gebruik om boodskappe te bekom, maar dit is minder gerieflik aangesien die soekopdrag handmatig geformateer moet word. Byvoorbeeld:

curl -k 'imaps://1.2.3.4/INBOX' -X 'UID SEARCH ALL' --user user:pass
curl -k 'imaps://1.2.3.4/INBOX;UID=1' --user user:pass

Ook moontlik om net dele van 'n boodskap af te laai, bv. onderwerp en sender van die eerste 5 boodskappe (die -v is vereis om die onderwerp en sender te sien):

$ curl -k 'imaps://1.2.3.4/INBOX' -X 'FETCH 1:5 BODY[HEADER.FIELDS (SUBJECT FROM)]' --user user:pass -v 2>&1 | grep '^<'

Alhoewel, dit is waarskynlik skoner om net 'n bietjie vir-lus te skryf:

for m in {1..5}; do
echo $m
curl "imap://1.2.3.4/INBOX;MAILINDEX=$m;SECTION=HEADER.FIELDS%20(SUBJECT%20FROM)" --user user:pass
done

Shodan

• port:143 CAPABILITY

• port:993 CAPABILITY

HackTricks Outomatiese Opdragte

Protocol_Name: IMAP    #Protocol Abbreviation if there is one.
Port_Number:  143,993     #Comma separated if there is more than one.
Protocol_Description: Internet Message Access Protocol         #Protocol Abbreviation Spelled out

Entry_1:
Name: Notes
Description: Notes for WHOIS
Note: |
The Internet Message Access Protocol (IMAP) is designed for the purpose of enabling users to access their email messages from any location, primarily through an Internet connection. In essence, emails are retained on a server rather than being downloaded and stored on an individual's personal device. This means that when an email is accessed or read, it is done directly from the server. This capability allows for the convenience of checking emails from multiple devices, ensuring that no messages are missed regardless of the device used.

https://book.hacktricks.xyz/pentesting/pentesting-imap

Entry_2:
Name: Banner Grab
Description: Banner Grab 143
Command: nc -nv {IP} 143

Entry_3:
Name: Secure Banner Grab
Description: Banner Grab 993
Command: openssl s_client -connect {IP}:993 -quiet

Entry_4:
Name: consolesless mfs enumeration
Description: IMAP enumeration without the need to run msfconsole
Note: sourced from https://github.com/carlospolop/legion
Command: msfconsole -q -x 'use auxiliary/scanner/imap/imap_version; set RHOSTS {IP}; set RPORT 143; run; exit'

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