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CVE-2021-43797

CVE-2021-43797 · HTTP fails to validate against control chars in header names which may lead to HTTP request smuggling

This page contains facts from public vulnerability sources. Check the original advisory before updating.

Netty is an asynchronous event-driven network application framework for rapid development of maintainable high performance protocol servers & clients. Netty prior to version 4.1.71.Final skips control chars when they are present at the beginning / end of the header name. It should instead fail fast as these are not allowed by the spec and could lead to HTTP request smuggling. Failing to do the validation might cause netty to "sanitize" header names before it forward these to another remote system when used as proxy. This remote system can't see the invalid usage anymore, and therefore does not do the validation itself. Users should upgrade to version 4.1.71.Final.

CVSS 6.5 · Medium · EPSS 2.9% · Fix available

Published
Updated

Stack: system

Affected products and versions

  • netty

    Versions
    • <= 4.1.7.0.Final: Affected

    No fix published

  • netty Debian:12

    Affected ranges
    • ECOSYSTEM: < 1:4.1.48-6

    Update to 1:4.1.48-6

  • netty Debian:13

    Affected ranges
    • ECOSYSTEM: < 1:4.1.48-6

    Update to 1:4.1.48-6

  • netty Debian:14

    Affected ranges
    • ECOSYSTEM: < 1:4.1.48-6

    Update to 1:4.1.48-6

  • netty Ubuntu:Pro:14.04:LTS

    Versions
    • 1:3.2.6.Final-2
    • 1:3.2.6.Final-2+deb8u2build0.14.04.1~esm1
    • 1:3.2.6.Final-2+deb8u2ubuntu0.1~esm1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • netty Ubuntu:Pro:16.04:LTS

    Versions
    • 1:3.2.6.Final-2
    • 1:4.0.32-1
    • 1:4.0.33-1
    • 1:4.0.34-1
    Affected ranges
    • ECOSYSTEM: < 1:4.0.34-1ubuntu0.1~esm1

    Update to 1:4.0.34-1ubuntu0.1~esm1

  • netty Ubuntu:Pro:18.04:LTS

    Versions
    • 1:4.1.7-4
    • 1:4.1.7-4ubuntu0.1~esm1
    • 1:4.1.7-4ubuntu0.1
    • 1:4.1.7-4ubuntu0.1+esm1
    Affected ranges
    • ECOSYSTEM: < 1:4.1.7-4ubuntu0.1+esm2

    Update to 1:4.1.7-4ubuntu0.1+esm2

  • netty Ubuntu:Pro:20.04:LTS

    Versions
    • 1:4.1.33-1
    • 1:4.1.33-2
    • 1:4.1.33-3
    • 1:4.1.45-1
    Affected ranges
    • ECOSYSTEM: < 1:4.1.45-1ubuntu0.1~esm1

    Update to 1:4.1.45-1ubuntu0.1~esm1

  • netty Ubuntu:22.04:LTS

    Versions
    • 1:4.1.48-4
    Affected ranges
    • ECOSYSTEM: < 1:4.1.48-4+deb11u1build0.22.04.1

    Update to 1:4.1.48-4+deb11u1build0.22.04.1

Original sources

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