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-----BEGIN PGP SIGNED MESSAGE----- =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2000.217 -- FreeBSD-SA-00:35 proftpd port contains remote root compromise 17 August 2000 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: proftpd Vendor: FreeBSD Ports Collection Operating System: FreeBSD Linux Unix Platform: N/A Impact: Root Compromise Access Required: Remote - --------------------------BEGIN INCLUDED TEXT-------------------- - -----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 <lamagra@DIGIBEL.ORG> 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----- - --------------------------END INCLUDED TEXT-------------------- This security bulletin is provided as a service to AusCERT's members. As AusCERT did not write the document quoted above, AusCERT has had no control over its content. The decision to use any or all of this information is the responsibility of each user or organisation, and should be done so in accordance with site policies and procedures. NOTE: This is only the original release of the security bulletin. It may not be updated when updates to the original are made. If downloading at a later date, it is recommended that the bulletin is retrieved directly from the original authors to ensure that the information is still current. Contact information for the authors of the original document is included in the Security Bulletin above. If you have any questions or need further information, please contact them directly. Previous advisories and external security bulletins can be retrieved from: http://www.auscert.org.au/Information/advisories.html If you believe that your system has been compromised, contact AusCERT or your representative in FIRST (Forum of Incident Response and Security Teams). Internet Email: auscert@auscert.org.au Facsimile: (07) 3365 7031 Telephone: (07) 3365 4417 (International: +61 7 3365 4417) AusCERT personnel answer during Queensland business hours which are GMT+10:00 (AEST). On call after hours for emergencies. -----BEGIN PGP SIGNATURE----- Version: 2.6.3i Charset: noconv Comment: ftp://ftp.auscert.org.au/pub/auscert/AUSCERT_PGP.key iQCVAwUBOaD00Sh9+71yA2DNAQFcfwP8DaybOC+kt97O3FzR1JhqcUqXZlbvnyXg xkP4rg9H7k8FIgS5xSHLftukw2gSjmflro2hw9KiWmYyWAxrHnCvMOdov4Oof4gA tKn4Hmw3SD8ZRgrT5sf1qmANIWjLPQii0nsWSY/lVQaNF/fRhPBYb88rNuCOvzCj a1IvQUL9xBQ= =2AXz -----END PGP SIGNATURE-----