From owner-freebsd-security-notifications@FreeBSD.ORG Mon Jan 14 23:09:40 2008 Return-Path: Delivered-To: freebsd-security-notifications@hub.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 2340316A421; Mon, 14 Jan 2008 23:09:40 +0000 (UTC) (envelope-from security-advisories@FreeBSD.org) Received: from freefall.freebsd.org (freefall.freebsd.org [IPv6:2001:4f8:fff6::28]) by mx1.freebsd.org (Postfix) with ESMTP id 094C313C4E3; Mon, 14 Jan 2008 23:09:40 +0000 (UTC) (envelope-from security-advisories@FreeBSD.org) Received: from freefall.freebsd.org (cperciva@localhost [127.0.0.1]) by freefall.freebsd.org (8.14.2/8.14.2) with ESMTP id m0EN9dwY056508; Mon, 14 Jan 2008 23:09:39 GMT (envelope-from security-advisories@freebsd.org) Received: (from cperciva@localhost) by freefall.freebsd.org (8.14.2/8.14.1/Submit) id m0EN9dnN056506; Mon, 14 Jan 2008 23:09:39 GMT (envelope-from security-advisories@freebsd.org) Date: Mon, 14 Jan 2008 23:09:39 GMT Message-Id: <200801142309.m0EN9dnN056506@freefall.freebsd.org> X-Authentication-Warning: freefall.freebsd.org: cperciva set sender to security-advisories@freebsd.org using -f From: FreeBSD Security Advisories To: FreeBSD Security Advisories Precedence: bulk Cc: Subject: FreeBSD Security Advisory FreeBSD-SA-08:01.pty X-BeenThere: freebsd-security-notifications@freebsd.org X-Mailman-Version: 2.1.5 Reply-To: freebsd-security@FreeBSD.org List-Id: "Moderated Security Notifications \[moderated, low volume\]" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 14 Jan 2008 23:09:40 -0000 -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 ============================================================================= FreeBSD-SA-08:01.pty Security Advisory The FreeBSD Project Topic: pty snooping Category: core Module: libc_stdlib / libutil Announced: 2008-01-14 Credits: John Baldwin Affects: FreeBSD 5.0 and later. Corrected: 2008-01-14 22:57:45 UTC (RELENG_7, 7.0-PRERELEASE) 2008-01-14 22:55:54 UTC (RELENG_7_0, 7.0-RC2) 2008-01-14 22:56:05 UTC (RELENG_6, 6.3-PRERELEASE) 2008-01-14 22:56:18 UTC (RELENG_6_3, 6.3-RELEASE) 2008-01-14 22:56:44 UTC (RELENG_6_2, 6.2-RELEASE-p10) 2008-01-14 22:56:56 UTC (RELENG_6_1, 6.1-RELEASE-p22) 2008-01-14 22:57:06 UTC (RELENG_5, 5.5-STABLE) 2008-01-14 22:57:19 UTC (RELENG_5_5, 5.5-RELEASE-p18) CVE Name: CVE-2008-0216, CVE-2008-0217 For general information regarding FreeBSD Security Advisories, including descriptions of the fields above, security branches, and the following sections, please visit . I. Background pt_chown is a setuid root support utility used by grantpt(3) to change ownership of a tty. openpty(3) is a support function in libutil which is used to obtain a pseudo-terminal. script(1) is a utility which makes a typescript of everything printed on a terminal. II. Problem Description Two issues exist in the FreeBSD pty handling. If openpty(3) is called as non-root user the newly created pseudo-terminal is world readable and writeable. While this is documented to be the case, script(1) still uses openpty(3) and script(1) may be used by non-root users [CVE-2008-0217]. The ptsname(3) function incorrectly extracts two characters from the name of a device node in /dev without verifying that it's actually operating on a valid pty which the calling user owns. pt_chown uses the bad result from ptsname(3) to change ownership of a pty to the user calling pt_chown [CVE-2008-0216]. III. Impact If an unprivileged user is running script(1), or another program which uses openpty(3), an attacker may snoop text which is printed to the users terminal. If a malicious user has read access to a device node with characters in the device name that match the name of a pty, then the malicious user can read the content of the pty from another user. The malicious user can open a lot of tty's resulting in a high probabilty of a new user obtaining the pty name of a "vulnerable" pty. NOTE WELL: If a user snoops a pty the snooped text will not be shown to the real user, which in many cases mean the real owner of the pty will be able to know the attack is taking place. IV. Workaround Do not run script(1) as a non-root user. The ptsname(3) issue only affects FreeBSD 6.0 and newer. V. Solution Perform one of the following: 1) Upgrade your vulnerable system to 5-STABLE, 6-STABLE, or 7.0-PRERELEASE, or to the RELENG_7_0, RELENG_6_3, RELENG_6_2, RELENG_6_1, or RELENG_5_5 security branch dated after the correction date. 2) To patch your present system: The following patches have been verified to apply to FreeBSD 5.5, 6.1, 6.2, 6.3, and 7.0 systems. a) Download the relevant patch from the location below, and verify the detached PGP signature using your PGP utility. [FreeBSD 5.5] # fetch http://security.FreeBSD.org/patches/SA-08:01/pty5.patch # fetch http://security.FreeBSD.org/patches/SA-08:01/pty5.patch.asc [FreeBSD 6.x] # fetch http://security.FreeBSD.org/patches/SA-08:01/pty6.patch # fetch http://security.FreeBSD.org/patches/SA-08:01/pty6.patch.asc [FreeBSD 7.0] # fetch http://security.FreeBSD.org/patches/SA-08:01/pty7.patch # fetch http://security.FreeBSD.org/patches/SA-08:01/pty7.patch.asc b) Execute the following commands as root: # cd /usr/src # patch < /path/to/patch c) Recompile the operating system as described in and reboot the system. VI. Correction details The following list contains the revision numbers of each file that was corrected in FreeBSD. Branch Revision Path - ------------------------------------------------------------------------- RELENG_5 src/lib/libutil/pty.c 1.15.4.1 RELENG_5_5 src/UPDATING 1.342.2.35.2.18 src/sys/conf/newvers.sh 1.62.2.21.2.20 src/lib/libutil/pty.c 1.15.16.1 RELENG_6 src/lib/libc/stdlib/grantpt.c 1.4.2.2 src/lib/libutil/pty.c 1.15.10.2 RELENG_6_3 src/UPDATING 1.416.2.37.2.3 src/sys/conf/newvers.sh 1.69.2.15.2.3 src/lib/libc/stdlib/grantpt.c 1.4.10.2 src/lib/libutil/pty.c 1.15.20.2 RELENG_6_2 src/UPDATING 1.416.2.29.2.13 src/sys/conf/newvers.sh 1.69.2.13.2.13 src/lib/libc/stdlib/grantpt.c 1.4.8.1 src/lib/libutil/pty.c 1.15.18.1 RELENG_6_1 src/UPDATING 1.416.2.22.2.24 src/sys/conf/newvers.sh 1.69.2.11.2.24 src/lib/libc/stdlib/grantpt.c 1.4.6.1 src/lib/libutil/pty.c 1.15.14.1 RELENG_7 src/lib/libc/stdlib/grantpt.c 1.7.2.4 src/lib/libutil/pty.c 1.17.2.3 RELENG_7_0 src/UPDATING 1.507.2.3.2.1 src/sys/conf/newvers.sh 1.72.2.5.2.2 src/lib/libc/stdlib/grantpt.c 1.7.2.2.2.2 src/lib/libutil/pty.c 1.17.2.2.2.1 - ------------------------------------------------------------------------- VII. References http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-0216 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-0217 The latest revision of this advisory is available at http://security.FreeBSD.org/advisories/FreeBSD-SA-08:01.pty.asc -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.7 (FreeBSD) iD8DBQFHi+nfFdaIBMps37IRAhtUAJ9GXtRjTIxcbrCOxoMnO50ZLc5mAgCdGSyO D83MVnUtP9rhzD2JfOPbaOw= =V/kt -----END PGP SIGNATURE----- From owner-freebsd-security-notifications@FreeBSD.ORG Mon Jan 14 23:09:43 2008 Return-Path: Delivered-To: freebsd-security-notifications@hub.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id D325216A4AB; Mon, 14 Jan 2008 23:09:43 +0000 (UTC) (envelope-from security-advisories@FreeBSD.org) Received: from freefall.freebsd.org (freefall.freebsd.org [IPv6:2001:4f8:fff6::28]) by mx1.freebsd.org (Postfix) with ESMTP id A94E713C448; Mon, 14 Jan 2008 23:09:43 +0000 (UTC) (envelope-from security-advisories@FreeBSD.org) Received: from freefall.freebsd.org (cperciva@localhost [127.0.0.1]) by freefall.freebsd.org (8.14.2/8.14.2) with ESMTP id m0EN9hLQ056551; Mon, 14 Jan 2008 23:09:43 GMT (envelope-from security-advisories@freebsd.org) Received: (from cperciva@localhost) by freefall.freebsd.org (8.14.2/8.14.1/Submit) id m0EN9hYM056549; Mon, 14 Jan 2008 23:09:43 GMT (envelope-from security-advisories@freebsd.org) Date: Mon, 14 Jan 2008 23:09:43 GMT Message-Id: <200801142309.m0EN9hYM056549@freefall.freebsd.org> X-Authentication-Warning: freefall.freebsd.org: cperciva set sender to security-advisories@freebsd.org using -f From: FreeBSD Security Advisories To: FreeBSD Security Advisories Precedence: bulk Cc: Subject: FreeBSD Security Advisory FreeBSD-SA-08:02.libc X-BeenThere: freebsd-security-notifications@freebsd.org X-Mailman-Version: 2.1.5 Reply-To: freebsd-security@FreeBSD.org List-Id: "Moderated Security Notifications \[moderated, low volume\]" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 14 Jan 2008 23:09:43 -0000 -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 ============================================================================= FreeBSD-SA-08:02.libc Security Advisory The FreeBSD Project Topic: inet_network() buffer overflow Category: core Module: libc Announced: 2008-01-14 Credits: Bjoern A. Zeeb and Nate Eldredge Affects: FreeBSD 6.2 Corrected: 2008-01-14 22:57:45 UTC (RELENG_7, 7.0-PRERELEASE) 2008-01-14 22:55:54 UTC (RELENG_7_0, 7.0-RC2) 2008-01-14 22:56:05 UTC (RELENG_6, 6.3-PRERELEASE) 2008-01-14 22:56:18 UTC (RELENG_6_3, 6.3-RELEASE) 2008-01-14 22:56:44 UTC (RELENG_6_2, 6.2-RELEASE-p10) CVE Name: CVE-2008-0122 For general information regarding FreeBSD Security Advisories, including descriptions of the fields above, security branches, and the following sections, please visit . I. Background The resolver is the part of libc that resolves hostnames (example.com) to internet protocol (IP) addresses (192.0.2.1) and vice versa. The inet_network() function returns an in_addr_t representing the network address of the IP address given to inet_network() as a character string in the dot-notation. II. Problem Description An off-by-one error in the inet_network() function could lead to memory corruption with certain inputs. III. Impact For programs which passes untrusted data to inet_network(), an attacker may be able to overwrite a region of memory with user defined data by causing specially crafted input to be passed to inet_network(). Depending on the region of memory the attacker is able to overwrite, this might lead to a denial of service or potentially code execution in the program using inet_network(). IV. Workaround No workaround is available. V. Solution Perform one of the following: 1) Upgrade your vulnerable system to 7.0-PRERELEASE, or 6-STABLE, or to the, RELENG_7_0, RELENG_6_3, or RELENG_6_2 security branch dated after the correction date. 2) To patch your present system: The following patches have been verified to apply to FreeBSD 7.0, 6.3, or 6.2 systems. a) Download the relevant patch from the location below, and verify the detached PGP signature using your PGP utility. # fetch http://security.FreeBSD.org/patches/SA-08:02/libc.patch # fetch http://security.FreeBSD.org/patches/SA-08:02/libc.patch.asc b) Execute the following commands as root: # cd /usr/src # patch < /path/to/patch c) Recompile the operating system as described in and reboot the system. VI. Correction details The following list contains the revision numbers of each file that was corrected in FreeBSD. Branch Revision Path - ------------------------------------------------------------------------- RELENG_6 src/lib/libc/inet/inet_network.c 1.2.2.2 RELENG_6_3 src/UPDATING 1.416.2.37.2.3 src/sys/conf/newvers.sh 1.69.2.15.2.3 src/lib/libc/inet/inet_network.c 1.2.2.1.4.1 RELENG_6_2 src/UPDATING 1.416.2.29.2.13 src/sys/conf/newvers.sh 1.69.2.13.2.13 src/lib/libc/inet/inet_network.c 1.2.2.1.2.1 RELENG_7 src/lib/libc/inet/inet_network.c 1.4.2.1 RELENG_7_0 src/UPDATING 1.507.2.3.2.1 src/sys/conf/newvers.sh 1.72.2.5.2.2 src/lib/libc/inet/inet_network.c 1.4.4.1 - ------------------------------------------------------------------------- VII. References http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-0122 The latest revision of this advisory is available at http://security.FreeBSD.org/advisories/FreeBSD-SA-08:02.libc.asc -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.7 (FreeBSD) iD8DBQFHi+ntFdaIBMps37IRAr+GAJ9YxPIsD5OeyYkrwo5auWKgQwZRywCdHSrY NsNxcHsgdo7divn+LEkQ9po= =3RQQ -----END PGP SIGNATURE-----