CWE-577 Variant Draft

EJB Bad Practices: Use of Sockets

This vulnerability occurs when an Enterprise JavaBeans (EJB) component breaks the EJB specification by directly creating or using network sockets.

Definition

What is CWE-577?

This vulnerability occurs when an Enterprise JavaBeans (EJB) component breaks the EJB specification by directly creating or using network sockets.
The EJB specification sets clear rules to ensure components are portable and behave consistently across different application servers. One of these rules explicitly forbids EJB beans from acting as network servers—meaning they must not open sockets to listen for or accept incoming connections. This restriction preserves the server's ability to manage resources, control the bean's lifecycle, and maintain transactional integrity. Allowing an EJB to become a socket server conflicts with its primary role as a managed component serving EJB clients. It can destabilize the container, interfere with clustering and load balancing, and create unpredictable security and performance issues. Instead, socket-based server functionality should be implemented outside the EJB container, in a managed service or a dedicated layer, keeping the bean's design aligned with its intended client-serving architecture.
Auswirkungen in der Praxis

Real-world CVEs caused by CWE-577

Bisher sind in MITREs Katalog keine öffentlichen CVE-Referenzen mit dieser CWE verknüpft.

Wie Angreifer es ausnutzen

Angreiferpfad Schritt für Schritt

  1. 1

    The following Java example is a simple stateless Enterprise JavaBean that retrieves stock symbols and stock values. The Enterprise JavaBean creates a socket and listens for and accepts connections from clients on the socket.

  2. 2

    And the following Java example is similar to the previous example but demonstrates the use of multicast socket connections within an Enterprise JavaBean.

  3. 3

    The previous two examples within any type of Enterprise JavaBean violate the EJB specification by attempting to listen on a socket, accepting connections on a socket, or using a socket for multicast.

Verwundbares Codebeispiel

Vulnerable Java

The following Java example is a simple stateless Enterprise JavaBean that retrieves stock symbols and stock values. The Enterprise JavaBean creates a socket and listens for and accepts connections from clients on the socket.

Verwundbar Java 
@Stateless
  public class StockSymbolBean implements StockSymbolRemote {
  		ServerSocket serverSocket = null;
  		Socket clientSocket = null;
  		public StockSymbolBean() {
  				try {
  					serverSocket = new ServerSocket(Constants.SOCKET_PORT);
  				} catch (IOException ex) {...}
  				try {
  					clientSocket = serverSocket.accept();
  				} catch (IOException e) {...}
  		}
  		public String getStockSymbol(String name) {...}
  		public BigDecimal getStockValue(String symbol) {...}
  		private void processClientInputFromSocket() {...}
  }
Sicheres Codebeispiel

Secure pseudo

Sicher pseudo 
// Validate, sanitize, or use a safe API before reaching the sink.
function handleRequest(input) {
  const safe = validateAndEscape(input);
  return executeWithGuards(safe);
}
What changed: the unsafe sink is replaced (or the input is validated/escaped) so the same payload no longer triggers the weakness.
Präventions-Checkliste

How to prevent CWE-577

  • Architecture and Design / Implementation Do not use Sockets when writing EJBs.
Erkennungssignale

How to detect CWE-577

SAST High

Führe statische Analyse (SAST) auf der Codebasis aus und suche im Datenfluss nach dem unsicheren Muster.

DAST Moderate

Führe dynamische Application-Security-Tests gegen den Live-Endpoint aus.

Runtime Moderate

Beobachte Runtime-Logs auf ungewöhnliche Exception-Traces, fehlerhafte Eingaben oder Versuche, Autorisierung zu umgehen.

Code review Moderate

Code Review: Markiere jeden neuen Code, der Eingaben von dieser Oberfläche ohne validierte Framework-Helper verarbeitet.

Plexicus Auto-Fix

Plexicus erkennt CWE-577 automatisch und öffnet in unter 60 Sekunden einen Fix-PR.

Codex Remedium scannt jeden Commit, identifiziert genau diese Schwachstelle und liefert einen reviewer-ready Pull Request mit dem Patch. Keine Tickets. Keine Hand-offs.

Demo anfordern Plexicus kostenlos testen
Häufig gestellte Fragen

Frequently asked questions

Was ist CWE-577?

This vulnerability occurs when an Enterprise JavaBeans (EJB) component breaks the EJB specification by directly creating or using network sockets.

Wie gravierend ist CWE-577?

MITRE hat für diese Schwachstelle keine Exploit-Wahrscheinlichkeit veröffentlicht. Behandle sie als mittlere Auswirkung, bis dein Threat Model anderes belegt.

Welche Sprachen oder Plattformen sind von CWE-577 betroffen?

MITRE lists the following affected platforms: Java.

Wie kann ich CWE-577 verhindern?

Do not use Sockets when writing EJBs.

Wie erkennt und behebt Plexicus CWE-577?

Die SAST-Engine von Plexicus erkennt die Datenfluss-Signatur von CWE-577 bei jedem Commit. Bei einem Treffer öffnet unser Codex-Remedium-Agent einen Fix-PR mit korrigiertem Code, Tests und einer einzeiligen Zusammenfassung für den Reviewer.

Wo erfahre ich mehr über CWE-577?

MITRE veröffentlicht die kanonische Definition unter https://cwe.mitre.org/data/definitions/577.html. Für ergänzende Hinweise kannst du auch die OWASP- und NIST-Dokumentation heranziehen.

Verwandte Schwachstellen

Weaknesses related to CWE-577

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CWE-304 Sibling

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CWE-325 Sibling

Missing Cryptographic Step

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Ressourcen

Further reading

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