netdev - Fw: [Bug 206943] New: Forcing IP fragmentation on TCP segments maliciously

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Date:   Wed, 25 Mar 2020 08:26:38 -0700
From:   Stephen Hemminger <stephen@...workplumber.org>
To:     netdev@...r.kernel.org
Subject: Fw: [Bug 206943] New: Forcing IP fragmentation on TCP segments
 maliciously



Begin forwarded message:

Date: Wed, 25 Mar 2020 08:37:58 +0000
From: bugzilla-daemon@...zilla.kernel.org
To: stephen@...workplumber.org
Subject: [Bug 206943] New: Forcing IP fragmentation on TCP segments maliciously


https://bugzilla.kernel.org/show_bug.cgi?id=206943

            Bug ID: 206943
           Summary: Forcing IP fragmentation on TCP segments maliciously
           Product: Networking
           Version: 2.5
    Kernel Version: version 3.9
          Hardware: All
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: high
          Priority: P1
         Component: IPV4
          Assignee: stephen@...workplumber.org
          Reporter: fengxw18@...ls.tsinghua.edu.cn
        Regression: No

A forged ICMP "Fragmentation Needed" message embedded with an echo reply data
can be used to defer the feedback of path MTU, thus tricking a Linux-based host
(version 3.9 and higher) into fragmenting TCP segments, even if the host
performs Path MTU discovery (PMTUD). Hence, an off-path attacker can poison the
TCP data via IP fragmentation.

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