From owner-freebsd-bugs@FreeBSD.ORG Mon Dec 15 01:24:51 2014 Return-Path: Delivered-To: freebsd-bugs@FreeBSD.org Received: from mx1.freebsd.org (mx1.freebsd.org [8.8.178.115]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by hub.freebsd.org (Postfix) with ESMTPS id 882905B1 for ; Mon, 15 Dec 2014 01:24:51 +0000 (UTC) Received: from kenobi.freebsd.org (kenobi.freebsd.org [IPv6:2001:1900:2254:206a::16:76]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by mx1.freebsd.org (Postfix) with ESMTPS id 47DCBBB6 for ; Mon, 15 Dec 2014 01:24:51 +0000 (UTC) Received: from bugs.freebsd.org ([127.0.1.118]) by kenobi.freebsd.org (8.14.9/8.14.9) with ESMTP id sBF1OpDq015615 for ; Mon, 15 Dec 2014 01:24:51 GMT (envelope-from bugzilla-noreply@freebsd.org) From: bugzilla-noreply@freebsd.org To: freebsd-bugs@FreeBSD.org Subject: [Bug 195984] New: [jail] security bug in jail utility: setgid missing/fails during creation Date: Mon, 15 Dec 2014 01:24:51 +0000 X-Bugzilla-Reason: AssignedTo X-Bugzilla-Type: new X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: Base System X-Bugzilla-Component: bin X-Bugzilla-Version: 10.1-RELEASE X-Bugzilla-Keywords: X-Bugzilla-Severity: Affects Many People X-Bugzilla-Who: nospam@mgedv.net X-Bugzilla-Status: New X-Bugzilla-Priority: --- X-Bugzilla-Assigned-To: freebsd-bugs@FreeBSD.org X-Bugzilla-Target-Milestone: --- X-Bugzilla-Flags: X-Bugzilla-Changed-Fields: bug_id short_desc product version rep_platform op_sys bug_status bug_severity priority component assigned_to reporter cc attachments.created Message-ID: Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 7bit X-Bugzilla-URL: https://bugs.freebsd.org/bugzilla/ Auto-Submitted: auto-generated MIME-Version: 1.0 X-BeenThere: freebsd-bugs@freebsd.org X-Mailman-Version: 2.1.18-1 Precedence: list List-Id: Bug reports List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 15 Dec 2014 01:24:51 -0000 https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=195984 Bug ID: 195984 Summary: [jail] security bug in jail utility: setgid missing/fails during creation Product: Base System Version: 10.1-RELEASE Hardware: amd64 OS: Any Status: New Severity: Affects Many People Priority: --- Component: bin Assignee: freebsd-bugs@FreeBSD.org Reporter: nospam@mgedv.net CC: jamie@FreeBSD.org Created attachment 150594 --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=150594&action=edit jail setgid bug analysis and reproduce steps initial analysis [2014-12-06]: as the "real" application faces the same problems, i created a test jail on a clean box just to check the behaviour using "/usr/bin/id". problem description (hopefully i nailed it): if a jailed process needs any .so for startup, the path to those *.so needs to be world r-x, although the GID of the jail execute user is allowed to r/x the dirs, where the *.so files are to be found. there could be (ordering) errors with SET(e)GID in jail_* functions, because it works as expected when prefixing with "chroot -g test /". the EGID is dropped to the jail user's gid, but the GID is still 0! we end up with a jailed proc (UID=999, GID=0), which of course is not allowed to access the dirs for the *.so's to be loaded by exec. update from james gritton [2014-12-13]: There does indeed seem to be a missing setgid() in jail (compared to jexec, which gets it right). more details to be found in freebsd-questions list (attached, too). subject: freebsd 10.1-RELEASE: jail security errors - GID 0 not dropped completely -- You are receiving this mail because: You are the assignee for the bug.