What Port 1978 Is
Port 1978 sits in the registered port range (1024-49151). These ports are registered with IANA, the organization that manages Internet address assignments. Registration means a company or developer asked IANA to formally associate the port with their service, but unlike the well-known ports below 1024, registered ports require no special operating system privileges to open.
IANA lists port 1978 as assigned to UniSQL, for both TCP and UDP.
Who UniSQL Was
UniSQL, Inc. was founded in 1990 by Dr. Won Kim, a database researcher who helped pioneer the object-relational model, the idea that databases could store objects and complex types, not just flat tables. UniSQL's flagship product, UniSQL/X, shipped in 1992 and was one of the first commercial systems to unify relational SQL with object-oriented capabilities.
The company was acquired, its products discontinued, and by the late 1990s UniSQL was functionally gone. Port 1978 remained registered in its name, an empty address with a legitimate number.1
Why That Matters for Security
A port registered to a defunct service is a peculiar kind of vulnerability. The number looks official. Automated scanners and firewall rules that check against IANA assignments will see "UniSQL" and not flag it as suspicious. The tenant left, but the address still reads as occupied.
The Linux.Slapper worm exploited this in 2002. It targeted Apache web servers running on Linux with a vulnerable version of OpenSSL, and once inside, opened a backdoor on port 1978/UDP.2 A later variant, Slapper.B, did the same. Around the same time, Trojan.Win32 Bankshot was documented listening on port 1978/TCP, creating a Windows service running with SYSTEM-level privileges, exploitable via a stack buffer overflow.3
More recently, WiFi Mouse version 1.7.8.5 had a remote code execution vulnerability associated with this port, documented in CVE reports.4
How to Check What's on This Port
If you see traffic on port 1978 and want to know what's producing it:
On Linux or macOS:
On Windows:
The process ID in the output can be matched to an application in Task Manager or with:
Any listening service on port 1978 today warrants scrutiny. There is no active legitimate software that should be using it.
Why Unassigned and Abandoned Ports Matter
The registered port range contains over 48,000 numbers. IANA has assigned roughly a fraction of them, and of those assignments, many belong to products that no longer exist. This creates a large population of ports that look official but have no active, legitimate software behind them.
Attackers know this. A backdoor on port 1978 looks more plausible to a cursory review than a backdoor on a completely random high port. The legitimacy of the number is borrowed from a dead company.
The practical lesson: port registration status alone tells you nothing about whether traffic on a port is safe. What matters is whether you expect a specific, known application to be listening there. If you don't, it shouldn't be.
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