<p>Beberapa waktu lalu, ditemukan sebuah celah keamanan pada email server berbasis Zimbra, yaitu attacker berpotensi mengambil alih server Zimbra dengan cara mengirimkan email berbahaya yang mengandung virus, trojan atau ransomware (malware email). Untuk informasi detailnya bisa dicek pada referensi berikut : <a href="https://www.excellent.co.id/product-services/zimbra/informasi-zimbra-celah-keamanan-sistem/" target="_blank" rel="noopener">https://www.excellent.co.id/product-services/zimbra/informasi-zimbra-celah-keamanan-sistem/</a></p>
<p>Untuk menutup celah keamanan tersebut, Zimbra telah melakukan mitigasi pada release versi 8.8.15 Patch 23 dan 9.0.0 Patch 16 (<a href="https://blog.zimbra.com/2021/06/new-zimbra-patches-9-0-0-patch-16-and-8-8-15-patch-23/" target="_blank" rel="noopener">https://blog.zimbra.com/2021/06/new-zimbra-patches-9-0-0-patch-16-and-8-8-15-patch-23/</a>). Kemudian Team Excellent pun segera melakukan patch Zimbra untuk menutup celah keamanan tersebut. Setelah dilakukan proses patch, ada salah satu server klien muncul kendala dimana service LDAP dan Mailbox tidak bisa di start dengan pesan error sebagai berikut</p>
<pre>$ zmmailboxdctl start 
Starting mailboxd...[] INFO: master is down, falling back to replica... 
[] FATAL: failed to initialize LDAP client 
com.zimbra.cs.ldap.LdapException: LDAP error: : confidentiality required 
ExceptionId:main:1627517920706:5bec82d8a0d987f7 
Code:ldap.LDAP_ERROR 
at com.zimbra.cs.ldap.LdapException.LDAP_ERROR( LdapException.java:90 ) 
at com.zimbra.cs.ldap.unboundid.UBIDLdapException.mapToLdapException( UBIDLdapException.java:74 ) 
at com.zimbra.cs.ldap.unboundid.UBIDLdapException.mapToLdapException( UBIDLdapException.java:40 ) 
at com.zimbra.cs.ldap.unboundid.LdapConnectionPool.createConnPool( LdapConnectionPool.java:117 ) 
</pre>
<p>Karena klien tersebut menggunakan Zimbra versi Network Edition, salah satu benefit menggunakan Zimbra versi Network Edition yaitu, jika ada case tertentu yang cukup sulit diatasi, kami bisa tanyakan dan meminta bantuan langsung ke pihak Zimbra melalui remote akses. Dari pihak Zimbra pun akhirnya berhasil menangani case tersebut.</p>
<p>Untuk langkah-langkah eskalasinya, yaitu seperti berikut</p>
<p>Masuk ke user Zimbra</p>
<pre>su - zimbra</pre>
<p>Lalu ubah value pada attribute berikut</p>
<pre>zmlocalconfig -e ldap_starttls_supported=1 
zmlocalconfig -e ldap_starttls_required=true 
zmlocalconfig -e ldap_common_require_tls=0 
zmlocalconfig -e ssl_allow_untrusted_certs=false 
zmlocalconfig -e zimbra_require_interprocess_> 
Selanjutnya silakan restart service Zimbra 
<pre>zmcontrol restart</pre>
<p>Dan akhirnya service Zimbra dan aktivitas email pun berjalan normal kembali.</p>
<p>Ingin berlangganan atau ingin mengetahui lebih lanjut terkait layanan Excellent Managed Services Mail Server dan Zimbra Network Edition? Silahkan hubungi kami melalui website <a href="https://www.excellent.co.id/vps/" target="_blank" rel="noopener">https://www.excellent.co.id/vps/</a> atau email sales@excellent.co.id</p>
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