From security-advisories@freebsd.org Mon Aug 28 17:51:57 2000 From: FreeBSD Security Advisories To: BUGTRAQ@SECURITYFOCUS.COM Date: Mon, 28 Aug 2000 12:01:46 -0700 Subject: [BUGTRAQ] FreeBSD Ports Security Advisory: FreeBSD-SA-00:40.mopd -----BEGIN PGP SIGNED MESSAGE----- ============================================================================= FreeBSD-SA-00:40 Security Advisory FreeBSD, Inc. Topic: mopd port allows remote root compromise Category: ports Module: mopd Announced: 2000-08-28 Credits: Matt Power , OpenBSD Affects: Ports collection prior to the correction date. Corrected: 2000-08-09 Vendor status: Contacted FreeBSD only: NO I. Background mopd is used for netbooting older DEC machines such as VAXen and DECstations. II. Problem Description The mopd port contains several remotely exploitable vulnerabilities. An attacker exploiting these can execute arbitrary code on the local machine as root. The mopd port is not installed by default, nor is it "part of FreeBSD" as such: it is part of the FreeBSD ports collection, which contains over 3700 third-party applications in a ready-to-install format. The ports collections shipped with FreeBSD 3.5-RELEASE and 4.1-RELEASE contain this problem, since it was discovered after the releases. FreeBSD makes no claim about the security of these third-party applications, although an effort is underway to provide a security audit of the most security-critical ports. III. Impact Remote users can execute arbitrary code on the local machine as root. If you have not chosen to install the mopd port/package, then your system is not vulnerable to this problem. IV. Workaround One of the following: 1) Deinstall the mopd port/package, if you have installed it. 2) Restrict access to the mopd port using a perimeter firewall, or ipfw(8)/ipf(8) on the local machine. Note that users who pass these access restrictions may still exploit the vulnerability. V. Solution One of the following: 1) Upgrade your entire ports collection and rebuild the mopd port. 2) Deinstall the old package and install a new package dated after the correction date, obtained from: ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/i386/packages-3-stable/net/mopd-1.2b.tgz ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/i386/packages-4-stable/net/mopd-1.2b.tgz ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/alpha/packages-4-stable/net/mopd-1.2b.tgz ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/i386/packages-5-current/net/mopd-1.2b.tgz ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/alpha/packages-5-current/net/mopd-1.2b.tgz NOTE: Be sure to check the file creation date on the package, because the version number of the software has not changed. 3) download a new port skeleton for the mopd port from: http://www.freebsd.org/ports/ and use it to rebuild the port. 4) Use the portcheckout utility to automate option (3) above. The portcheckout port is available in /usr/ports/devel/portcheckout or the package can be obtained from: ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/i386/packages-3-stable/devel/portcheckout-2.0.tgz ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/i386/packages-4-stable/devel/portcheckout-2.0.tgz ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/alpha/packages-4-stable/devel/portcheckout-2.0.tgz ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/i386/packages-5-current/devel/portcheckout-2.0.tgz ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/alpha/packages-5-current/devel/portcheckout-2.0.tgz -----BEGIN PGP SIGNATURE----- Version: 2.6.2 iQCVAwUBOaqy6FUuHi5z0oilAQG14gQAn9RVxulK3pIyHi3aQ5j9p0OnlOoP9Wg2 yKEPARafL+WXHS1oJ+5ZGdhUG2rZjU1QktS0xTy5PXSo0mcX91jLJ7ASwg6K5w2e rpZMBRHZVFy3HltzFxwygZGGbENIbZNzZ9Qd9Luq/OPPxZzb/9NsHnUovk5/lyIE yCAt/USxiDs= =tlfC -----END PGP SIGNATURE-----