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.
CVE-2023-34462 - Medium Severity Vulnerability
Library home page: https://netty.io/
Dependency Hierarchy: - spring-boot-starter-webflux-2.7.5.jar (Root Library) - spring-boot-starter-reactor-netty-2.7.5.jar - reactor-netty-http-1.0.24.jar - netty-codec-http-4.1.84.Final.jar - :x: **netty-handler-4.1.84.Final.jar** (Vulnerable Library)
Found in HEAD commit: 2cda59cc9ba15234ad74bb5750717c564aad3b18
Found in base branch: master
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
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.Type: Upgrade version
Origin: https://github.com/advisories/GHSA-6mjq-h674-j845
Release Date: 2023-06-22
Fix Resolution (io.netty:netty-handler): 4.1.94.Final
Direct dependency fix Resolution (org.springframework.boot:spring-boot-starter-webflux): 2.7.14
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