From security-advisories@FreeBSD.ORG Tue Aug 15 00:12:25 2000 From: FreeBSD Security Advisories Resent-From: mea culpa To: undisclosed-recipients: ; Resent-To: jericho@attrition.org Date: Mon, 14 Aug 2000 15:50:06 -0700 (PDT) Reply-To: postmaster@FreeBSD.ORG Subject: FreeBSD Ports Security Advisory: FreeBSD-SA-00:35.proftpd -----BEGIN PGP SIGNED MESSAGE----- ============================================================================= FreeBSD-SA-00:35 Security Advisory FreeBSD, Inc. Topic: proftpd port contains remote root compromise Category: ports Module: proftpd Announced: 2000-08-14 Credits: lamagra Affects: Ports collection prior to the correction date. Corrected: 2000/07/28 Vendor status: Updated version released FreeBSD only: NO I. Background proftpd is a popular FTP server. II. Problem Description The proftpd port, versions prior to 1.2.0rc2, contains a vulnerability which allows FTP users, both anonymous FTP users and those with a valid account, to execute arbitrary code as root on the local machine, by inserting string-formatting operators into command input, which are incorrectly parsed by the FTP server. This is the same class of vulnerability as the one described in FreeBSD Security Advisory 00:29, which pertained to the wu-ftpd port. The proftpd port is not installed by default, nor is it "part of FreeBSD" as such: it is part of the FreeBSD ports collection, which contains nearly 3700 third-party applications in a ready-to-install format. The ports collections shipped with FreeBSD 3.5 contains this problem since it was discovered after the release, but FreeBSD 4.1 did not ship with the proftpd package (and the port was disabled to prevent building) because the vulnerability was known but not yet fixed. 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 FTP users, including anonymous FTP users, can cause arbitrary commands to be executed as root on the local machine. If you have not chosen to install the proftpd port/package, then your system is not vulnerable to this problem. IV. Workaround Deinstall the proftpd port/package, if you you have installed it. V. Solution One of the following: 1) Upgrade your entire ports collection and rebuild the proftpd 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/ftp/proftpd-1.2.0rc2.tgz ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/i386/packages-4-stable/ftp/proftpd-1.2.0rc2.tgz ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/alpha/packages-4-stable/ftp/proftpd-1.2.0rc2.tgz ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/i386/packages-5-current/ftp/proftpd-1.2.0rc2.tgz ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/alpha/packages-5-current/ftp/proftpd-1.2.0rc2.tgz NOTE: It may be several days before updated packages are available. 3) download a new port skeleton for the proftpd 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 iQCVAwUBOZh1u1UuHi5z0oilAQFYQQP/UH7MbeD/cm3aPGrPdb8NXUo9giAajayX uWazNh+kfJGUrpVg3DaYo7jY2ZG5yrBBo5kZRFUUSy5OpDvD20I3QBhtNV0gWItD n2mkSDP90BG4scmVuwx+GexCz5gZ+frpM2hKXlhtFqJRMA2Sk0R4vzapIvc16EFN 6nraHfzVSCk= =7ifu -----END PGP SIGNATURE----- To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-security-notifications" in the body of the message