CyberRota Analysis
AI-GeneratedThe vulnerability affects Netty's HAProxy encoder in versions prior to 4.1.136.Final and 4.2.16.Final, allowing attackers to inject CRLF sequences into the HAProxy V1 text protocol. This can lead to the splitting of the PROXY header, enabling the spoofing of client source or destination IP addresses to downstream servers or load balancers. Organizations using affected versions of Netty should prioritize updating to the patched versions to mitigate the risk of IP spoofing attacks.
Public Exploit Signal
A public exploit, PoC, GitHub repository or Metasploit reference was detected for this CVE.
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Original NVD Description
Netty is an asynchronous, event-driven network application framework. In versions prior to 4.1.136.Final and 4.2.16.Final, Netty's HAProxy encoder ( HAProxyMessageEncoder ) writes AF_UNIX source and destination socket addresses into the HAProxy V1 text protocol without validating them for CRLF characters, so an attacker who controls an AF_UNIX address can inject \r\n sequences and split the single PROXY header into multiple lines. This is possible because the V1 protocol uses CRLF as its line terminator and, unlike IPv4/IPv6 addresses whose format checks implicitly reject CRLF, AF_UNIX addresses are only validated for length (up to 108 bytes), allowing a forged second PROXY header line that spoofs the client source/destination IP to a downstream server or load balancer. The issue is fixed in versions 4.1.136.Final and 4.2.16.Final.
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