CVE-2023-34462 (Medium) detected in netty-handler-4.1.34.Final.jar

[mend-bolt-for-github]

CVE-2023-34462 - Medium Severity Vulnerability

Vulnerable Library - netty-handler-4.1.34.Final.jar

Netty is an asynchronous event-driven network application framework for rapid development of maintainable high performance protocol servers and clients.

Library home page: http://netty.io/

Path to dependency file: /spring-distributed-tracing/admin-server/pom.xml

Path to vulnerable library: /root/.m2/repository/io/netty/netty-handler/4.1.34.Final/netty-handler-4.1.34.Final.jar

Dependency Hierarchy:

• spring-boot-admin-starter-server-2.1.4.jar (Root Library)
  • spring-boot-admin-server-2.1.4.jar
    • spring-boot-starter-webflux-2.1.4.RELEASE.jar
      • spring-boot-starter-reactor-netty-2.1.4.RELEASE.jar
        • reactor-netty-0.8.6.RELEASE.jar
          • ❌ netty-handler-4.1.34.Final.jar (Vulnerable Library)

Found in base branch: master

Vulnerability Details

Netty is an asynchronous event-driven network application framework for rapid development of maintainable high performance protocol servers & clients. The SniHandler can allocate up to 16MB of heap for each channel during the TLS handshake. When the handler or the channel does not have an idle timeout, it can be used to make a TCP server using the SniHandler to allocate 16MB of heap. The SniHandler class is a handler that waits for the TLS handshake to configure a SslHandler according to the indicated server name by the ClientHello record. For this matter it allocates a ByteBuf using the value defined in the ClientHello record. Normally the value of the packet should be smaller than the handshake packet but there are not checks done here and the way the code is written, it is possible to craft a packet that makes the SslClientHelloHandler. This vulnerability has been fixed in version 4.1.94.Final.

Publish Date: 2023-06-22

URL: CVE-2023-34462

CVSS 3 Score Details (6.5)

Base Score Metrics:

• Exploitability Metrics:
  • Attack Vector: Network
  • Attack Complexity: Low
  • Privileges Required: Low
  • User Interaction: None
  • Scope: Unchanged
• Impact Metrics:
  • Confidentiality Impact: None
  • Integrity Impact: None
  • Availability Impact: High

For more information on CVSS3 Scores, click here.

Suggested Fix

Type: Upgrade version

Origin: GHSA-6mjq-h674-j845

Release Date: 2023-06-22

Fix Resolution (io.netty:netty-handler): 4.1.94.Final

Direct dependency fix Resolution (de.codecentric:spring-boot-admin-starter-server): 3.1.5

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