From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-0.8 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 962BCC54FD7 for ; Wed, 25 Mar 2020 15:26:48 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 6D41F20409 for ; Wed, 25 Mar 2020 15:26:48 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=networkplumber-org.20150623.gappssmtp.com header.i=@networkplumber-org.20150623.gappssmtp.com header.b="mwgeZr6o" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727815AbgCYP0r (ORCPT ); Wed, 25 Mar 2020 11:26:47 -0400 Received: from mail-pj1-f42.google.com ([209.85.216.42]:36152 "EHLO mail-pj1-f42.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727781AbgCYP0o (ORCPT ); Wed, 25 Mar 2020 11:26:44 -0400 Received: by mail-pj1-f42.google.com with SMTP id nu11so1144074pjb.1 for ; Wed, 25 Mar 2020 08:26:42 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=networkplumber-org.20150623.gappssmtp.com; s=20150623; h=date:from:to:subject:message-id:mime-version :content-transfer-encoding; bh=Jo1o8WxGsR4DDjQOkaqr5qz7Kw+VMjKaOlUaj2WGXt4=; b=mwgeZr6oL2gjls+8FIIus07Io/TGvStVa2i/+pcQzwxyxcGXJWu7B4f2PIzMbdempI 57eZ6HEPSFPEQv7hKdY58SLZ2hO709YKMc1IxHmvXI3pUl8iiMQ7pkV1RaMDXDV0gsQe jmBjIP6o6bbMDQyA0UWczeqFc1WjGph7xG1oj9iGFWZCrTAAQ/ZGqVNbJbbz/bXav+5n 1uXbmspVYUGCmsUuXh+kwTOvA5NGAgKTxC8b7AqXFD7z+RAJXauGAQIsKs7feSTSyM87 IGkoB7zAXdGKNJbCSRWMVaYkbrHaEkvcXohVvswybejGddPE4/WdUtPDf8x0XWOM64Oj UF3Q== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:from:to:subject:message-id:mime-version :content-transfer-encoding; bh=Jo1o8WxGsR4DDjQOkaqr5qz7Kw+VMjKaOlUaj2WGXt4=; b=is6AYWI28gHFUWNpQcF8903eOlibxAepgZCdU6+oYyrYRF/HAt3I5mgjQT17jYoRYO dEtYOxPI916I/ocyJoNYQ+Imz6syXB5n0T/5OUSDGyYGRKJUoBnvJISU48sB0Ss3T6v6 1haF9y41uhtqOabnDqzlWmB/oWzQrlS67EWMPirDoroSu64izVXXZWilj/dp7/wP0sKM 7FH+jlKo8xk6P+8PQjyiGtaHUXA3CVR2PbacWrW+MYrB2tchqyxSiM1Bd7L8rHJEF9mF /7QR/i/41MM+6kOzkA1LFjwuJhw4FBz6OZjTqhPd2VnIKQKKvGrtRb+qK83xJi9HtFpt Cnkg== X-Gm-Message-State: ANhLgQ2N3hoFTe9zr/RDyb7ealynZlnM+V1XCQ/v+udZCFj/l7M7vEY/ SkO8UF7yNyqD9dg8wNSpXj2Xu03vhkY5kw== X-Google-Smtp-Source: ADFU+vuJpgQUwzipgBLSBjCIB2/dcq6OvaAsOl3PTZw1e0DDFQlunYI2aAX0D5yLcg6QblYVW3NjFg== X-Received: by 2002:a17:902:7008:: with SMTP id y8mr3727469plk.279.1585150001641; Wed, 25 Mar 2020 08:26:41 -0700 (PDT) Received: from hermes.lan (204-195-22-127.wavecable.com. [204.195.22.127]) by smtp.gmail.com with ESMTPSA id e187sm18658553pfe.50.2020.03.25.08.26.41 for (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 25 Mar 2020 08:26:41 -0700 (PDT) Date: Wed, 25 Mar 2020 08:26:38 -0700 From: Stephen Hemminger To: netdev@vger.kernel.org Subject: Fw: [Bug 206943] New: Forcing IP fragmentation on TCP segments maliciously Message-ID: <20200325082638.60188be0@hermes.lan> MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org Begin forwarded message: Date: Wed, 25 Mar 2020 08:37:58 +0000 From: bugzilla-daemon@bugzilla.kernel.org To: stephen@networkplumber.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@networkplumber.org Reporter: fengxw18@mails.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. -- You are receiving this mail because: You are the assignee for the bug.