Smartermail 6919 Exploit ⚡ Direct Link
When a user or process connects to an endpoint like tcp://[target-ip]:17001/Servers , the server expects serialized objects to coordinate background mailing and administration tasks. However, the software does not properly validate the integrity or source of these objects before parsing them.
Understanding the SmarterMail Build 6919 Remote Code Execution Exploit
SmarterMail Build 6919 exploit is a critical vulnerability formally tracked as CVE-2019-7214 . It centers on the deserialization of untrusted data
All of these requests occur in rapid succession, suggesting [9†L40-L41]. smartermail 6919 exploit
[Attacker Machine] │ ▼ (Sends Malicious Serialized .NET Object via TCP) [Target Server: Port 17001 (/Servers)] │ ▼ (Unsafe Deserialization Occurs) [Arbitrary System Command Executed as NT AUTHORITY\SYSTEM] Impact and Privilege Level
When a client application interacts with these endpoints, data is passed over a TCP socket connection via serialized .NET objects. The software automatically deserializes this incoming, raw binary data without validating its source, integrity, or structure.
The SmarterMail 6919 exploit serves as a textbook example of why deserialization is a top-tier security risk. For organizations, it highlights the danger of running "set and forget" infrastructure. Regular patching remains the single most effective defense against RCE exploits of this nature. When a user or process connects to an
A typical internet-facing installation of SmarterMail Build 6919 or 6970 leaves tcp://0.0.0.0:17001/Servers open to public requests. This creates a direct vector for unauthenticated network packets to reach the deserialization routine. Anatomy of the Exploit
6919 (build 6919). After searching online for an exploit targeting SmarterMail 6919, I found a relevant entry on ExploitDB. Muhammad Ichwan
An attacker can send a specially crafted serialized .NET object via a TCP socket connection to these endpoints. Because the application does not properly validate or "neutralize" this data before parsing it, the attacker can force the server to execute arbitrary OS commands. It centers on the deserialization of untrusted data
[Attacker] │ ├── 1. Scans Port 9998 (Web UI) & Port 17001 (.NET Remoting) │ ├── 2. Identifies Build 6919 in Web Source Code │ ├── 3. Crafts Malicious Serialized .NET Object │ └── 4. Sends Object to tcp://[Target]:17001/Servers │ v [SmarterMail Server] ──(Deserializes Untrusted Data)──> [Executes Payload as SYSTEM] 1. Reconnaissance and Version Fingerprinting
The exploit for is primarily a .NET Deserialization vulnerability, tracked as CVE-2019-7214 . It allows unauthenticated attackers to achieve Remote Code Execution (RCE) by sending a malicious payload to an exposed .NET remoting endpoint. Technical Overview Vulnerability Type: .NET Deserialization of untrusted data.
SmarterMail (versions and builds prior to 6985) exposed three .NET remoting endpoints on the network—specifically named /Servers and /Spool —on TCP port 17001 . The application failed to validate data sent to these endpoints before deserializing it, processing it with high privileges. This allowed attackers to inject their own serialized .NET commands, which the server would execute.