From owner-svn-src-stable-12@freebsd.org Fri Mar 1 18:12:07 2019 Return-Path: Delivered-To: svn-src-stable-12@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id 33CEB151FB31; Fri, 1 Mar 2019 18:12:07 +0000 (UTC) (envelope-from kp@FreeBSD.org) Received: from mxrelay.nyi.freebsd.org (mxrelay.nyi.freebsd.org [IPv6:2610:1c1:1:606c::19:3]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) server-signature RSA-PSS (4096 bits) client-signature RSA-PSS (4096 bits) client-digest SHA256) (Client CN "mxrelay.nyi.freebsd.org", Issuer "Let's Encrypt Authority X3" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id C576A8AF30; Fri, 1 Mar 2019 18:12:06 +0000 (UTC) (envelope-from kp@FreeBSD.org) Received: from repo.freebsd.org (repo.freebsd.org [IPv6:2610:1c1:1:6068::e6a:0]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by mxrelay.nyi.freebsd.org (Postfix) with ESMTPS id 6F5092063A; Fri, 1 Mar 2019 18:12:06 +0000 (UTC) (envelope-from kp@FreeBSD.org) Received: from repo.freebsd.org ([127.0.1.37]) by repo.freebsd.org (8.15.2/8.15.2) with ESMTP id x21IC6NR069159; Fri, 1 Mar 2019 18:12:06 GMT (envelope-from kp@FreeBSD.org) Received: (from kp@localhost) by repo.freebsd.org (8.15.2/8.15.2/Submit) id x21IC6wW069158; Fri, 1 Mar 2019 18:12:06 GMT (envelope-from kp@FreeBSD.org) Message-Id: <201903011812.x21IC6wW069158@repo.freebsd.org> X-Authentication-Warning: repo.freebsd.org: kp set sender to kp@FreeBSD.org using -f From: Kristof Provost Date: Fri, 1 Mar 2019 18:12:06 +0000 (UTC) To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-12@freebsd.org Subject: svn commit: r344706 - stable/12/sys/netpfil/pf X-SVN-Group: stable-12 X-SVN-Commit-Author: kp X-SVN-Commit-Paths: stable/12/sys/netpfil/pf X-SVN-Commit-Revision: 344706 X-SVN-Commit-Repository: base MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-Rspamd-Queue-Id: C576A8AF30 X-Spamd-Bar: -- Authentication-Results: mx1.freebsd.org X-Spamd-Result: default: False [-2.94 / 15.00]; local_wl_from(0.00)[FreeBSD.org]; NEURAL_HAM_MEDIUM(-1.00)[-0.999,0]; NEURAL_HAM_SHORT(-0.94)[-0.937,0]; ASN(0.00)[asn:11403, ipnet:2610:1c1:1::/48, country:US]; NEURAL_HAM_LONG(-1.00)[-1.000,0] X-BeenThere: svn-src-stable-12@freebsd.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: SVN commit messages for only the 12-stable src tree List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 01 Mar 2019 18:12:07 -0000 Author: kp Date: Fri Mar 1 18:12:05 2019 New Revision: 344706 URL: https://svnweb.freebsd.org/changeset/base/344706 Log: MFC r344691: pf: IPv6 fragments with malformed extension headers could be erroneously passed by pf or cause a panic We mistakenly used the extoff value from the last packet to patch the next_header field. If a malicious host sends a chain of fragmented packets where the first packet and the final packet have different lengths or number of extension headers we'd patch the next_header at the wrong offset. This can potentially lead to panics or rule bypasses. Reported by: Corentin Bayet, Nicolas Collignon, Luca Moro at Synacktiv Approved by: so Obtained from: OpenBSD Security: CVE-2019-5597 Modified: stable/12/sys/netpfil/pf/pf_norm.c Directory Properties: stable/12/ (props changed) Modified: stable/12/sys/netpfil/pf/pf_norm.c ============================================================================== --- stable/12/sys/netpfil/pf/pf_norm.c Fri Mar 1 16:16:38 2019 (r344705) +++ stable/12/sys/netpfil/pf/pf_norm.c Fri Mar 1 18:12:05 2019 (r344706) @@ -668,11 +668,11 @@ pf_reassemble6(struct mbuf **m0, struct ip6_hdr *ip6, } /* We have all the data. */ + frent = TAILQ_FIRST(&frag->fr_queue); + KASSERT(frent != NULL, ("frent != NULL")); extoff = frent->fe_extoff; maxlen = frag->fr_maxlen; frag_id = frag->fr_id; - frent = TAILQ_FIRST(&frag->fr_queue); - KASSERT(frent != NULL, ("frent != NULL")); total = TAILQ_LAST(&frag->fr_queue, pf_fragq)->fe_off + TAILQ_LAST(&frag->fr_queue, pf_fragq)->fe_len; hdrlen = frent->fe_hdrlen - sizeof(struct ip6_frag);