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-----BEGIN PGP SIGNED MESSAGE----- =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2001.170 -- FreeBSD-SA-01:34.hylafax hylafax contains local compromise 26 April 2001 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: hylafax Vendor: FreeBSD Ports Collection Operating System: FreeBSD Platform: i386 Alpha Impact: Root Compromise Access Required: Existing Account - --------------------------BEGIN INCLUDED TEXT-------------------- - -----BEGIN PGP SIGNED MESSAGE----- ============================================================================= FreeBSD-SA-01:34 Security Advisory FreeBSD, Inc. Topic: hylafax contains local compromise Category: ports Module: hylafax Announced: 2001-04-23 Credits: Marcin Dawcewicz <miv@IIDEA.PL> Affects: Ports collection prior to the correction date. Corrected: 2001-04-17 Vendor status: Updated version released FreeBSD only: NO I. Background HylaFAX is a facsimile system for UNIX systems. II. Problem Description The hylafax port, versions prior to hylafax-4.1.b2_2, contains a format string bug in the hfaxd program. A local user may execute the hfaxd program with command-line arguments containing format string characters, potentially gaining root privileges on the local system. The hylafax 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 5000 third-party applications in a ready-to-install format. The ports collections shipped with FreeBSD 3.5.1 and 4.2 contain this problem since it was discovered after the releases. The ports collection that shipped with FreeBSD 4.3 is not vulnerable since this problem was corrected prior to the release. 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 Local users may gain root privileges on the local system. If you have not chosen to install the hylafax port/package, then your system is not vulnerable to this problem. IV. Workaround Deinstall the hylafax port/package if you have installed it. V. Solution One of the following: 1) Upgrade your entire ports collection and rebuild the hylafax port. 2) Deinstall the old package and install a new package dated after the correction date, obtained from: [i386] ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/i386/packages-4-stable/comms/hylafax-4.1.b2_2.tgz ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/i386/packages-5-current/comms/hylafax-4.1.b2_2.tgz NOTE: it may be several days before updated packages are available. [alpha] Packages are not automatically generated for the alpha architecture at this time due to lack of build resources. 3) download a new port skeleton for the hylafax 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: GnuPG v1.0.4 (FreeBSD) Comment: FreeBSD: The Power To Serve iQCVAwUBOuTqs1UuHi5z0oilAQEWwgQAlhOuE800ddI0J9hiGsQKli2LJyQ18ObQ w0/rdjahJDkOLrx5IGlFe9M1IzjbeXauYT6TUnaOxfwMo58bUy1T7QZ9ROUYzE39 DzrN1JmjcTshG3HdgsdVfSwjQirYpN6uvRVWQx6ncMpuN5bSw3RZ3ci4WH/LsKty tZ9P/gD6bAs= =EFP3 - -----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 iQCVAwUBOuhLtSh9+71yA2DNAQESRwP6AybQAfBn760rxL/jcSJMwSeSHOztS/2e a2PGwcpo+YsM88z7ik5UC7sQHOdzylQickvy6Sfw58ydJsGpcAa2OwEiPpHfssLW 8DdF0J5+kC3QWW0Yelaq2W5OG2/2sXrVNrEQHSBcXs2DZ1ES7GuMpuM5lkGNsWrm DVfbEDGiTtA= =q9zx -----END PGP SIGNATURE-----