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Advisories

Netty netty-tcnative before 2.0.84.Final SNI Hostname Spoofing via Modified UTF-8 Decoding

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Severity
medium
Date
Affecting

  • netty-tcnative >= 0, < 2.0.84.Final

  • netty-tcnative-boringssl-static >= 0, < 2.0.84.Final

CWE
  • CWE-176 Improper Handling of Unicode Encoding
CVSS
6.9
CVSS V4 Vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N
Credit
Yu Bao, PayPal Cyber Security Team
Description
Netty netty-tcnative before 2.0.84.Final contains an SNI hostname spoofing vulnerability that allows remote unauthenticated clients to alter hostnames via JNI NewStringUTF decoding. Attackers can send overlong encodings like 0xC0 0x80 in the ClientHello server_name to confuse SNI-based certificate selection, access decisions, and logging.

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