From owner-dev-commits-src-all@freebsd.org Tue Jun 1 20:36:55 2021 Return-Path: Delivered-To: dev-commits-src-all@mailman.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.nyi.freebsd.org (Postfix) with ESMTP id 4206A65D499; Tue, 1 Jun 2021 20:36:55 +0000 (UTC) (envelope-from git@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) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256 client-signature RSA-PSS (4096 bits) client-digest SHA256) (Client CN "mxrelay.nyi.freebsd.org", Issuer "R3" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 4FvkTz10VKz4hTv; Tue, 1 Jun 2021 20:36:55 +0000 (UTC) (envelope-from git@FreeBSD.org) Received: from gitrepo.freebsd.org (gitrepo.freebsd.org [IPv6:2610:1c1:1:6068::e6a:5]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (Client did not present a certificate) by mxrelay.nyi.freebsd.org (Postfix) with ESMTPS id 0A2651D4E; Tue, 1 Jun 2021 20:36:55 +0000 (UTC) (envelope-from git@FreeBSD.org) Received: from gitrepo.freebsd.org ([127.0.1.44]) by gitrepo.freebsd.org (8.16.1/8.16.1) with ESMTP id 151KasH0057684; Tue, 1 Jun 2021 20:36:54 GMT (envelope-from git@gitrepo.freebsd.org) Received: (from git@localhost) by gitrepo.freebsd.org (8.16.1/8.16.1/Submit) id 151KaspX057683; Tue, 1 Jun 2021 20:36:54 GMT (envelope-from git) Date: Tue, 1 Jun 2021 20:36:54 GMT Message-Id: <202106012036.151KaspX057683@gitrepo.freebsd.org> To: src-committers@FreeBSD.org, dev-commits-src-all@FreeBSD.org, dev-commits-src-branches@FreeBSD.org From: Mark Johnston Subject: git: 4e2e151b2099 - releng/11.4 - libradius: Fix attribute length validation in rad_get_attr(3) MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit X-Git-Committer: markj X-Git-Repository: src X-Git-Refname: refs/heads/releng/11.4 X-Git-Reftype: branch X-Git-Commit: 4e2e151b2099f3815ef1d170efc727c4b7cec98c Auto-Submitted: auto-generated X-BeenThere: dev-commits-src-all@freebsd.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: Commit messages for all branches of the src repository List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 01 Jun 2021 20:36:55 -0000 The branch releng/11.4 has been updated by markj: URL: https://cgit.FreeBSD.org/src/commit/?id=4e2e151b2099f3815ef1d170efc727c4b7cec98c commit 4e2e151b2099f3815ef1d170efc727c4b7cec98c Author: Mark Johnston AuthorDate: 2021-05-28 14:41:43 +0000 Commit: Mark Johnston CommitDate: 2021-06-01 20:32:50 +0000 libradius: Fix attribute length validation in rad_get_attr(3) The length of the attribute header needs to be excluded when comparing the attribute length against the length of the packet. Otherwise, validation may incorrectly fail when fetching the final attribute in a message. Approved by: so Security: FreeBSD-EN-21:17.libradius Fixes: 8d5c78130 ("libradius: Fix input validation bugs") Reported by: Peter Eriksson Tested by: Peter Eriksson Sponsored by: The FreeBSD Foundation (cherry picked from commit 6bb5699d2b59491097bc21ffa3c097cdd4853f89) (cherry picked from commit f9972532343bb1eb101bf7afef2966972eea3b5e) --- lib/libradius/radlib.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) diff --git a/lib/libradius/radlib.c b/lib/libradius/radlib.c index acca95da6f66..e679b95089b0 100644 --- a/lib/libradius/radlib.c +++ b/lib/libradius/radlib.c @@ -949,7 +949,12 @@ rad_get_attr(struct rad_handle *h, const void **value, size_t *lenp) } type = h->in[h->in_pos++]; len = h->in[h->in_pos++]; - if (len < 2 || h->in_pos + len > h->in_len) { + if (len < 2) { + generr(h, "Malformed attribute in response"); + return -1; + } + len -= 2; + if (h->in_pos + len > h->in_len) { generr(h, "Malformed attribute in response"); return -1; }