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-----BEGIN PGP SIGNED MESSAGE----- =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2002.008 -- FreeBSD-SA-02:05.pine pine port insecure URL handling 8 January 2002 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: pine Vendor: FreeBSD Ports Collection Operating System: FreeBSD BSD UNIX Impact: Execute Arbitrary Code/Commands Access Required: Remote - --------------------------BEGIN INCLUDED TEXT-------------------- - -----BEGIN PGP SIGNED MESSAGE----- ============================================================================= FreeBSD-SA-02:05 Security Advisory FreeBSD, Inc. Topic: pine port insecure URL handling Category: ports Module: pine Announced: 2002-01-04 Credits: zen-parse <zen-parse@gmx.net> Affects: Ports collection prior to the correction date Corrected: 2001-10-05 08:41:39 UTC FreeBSD only: NO I. Background PINE is an application for reading mail and news. II. Problem Description The pine port, versions previous to pine-4.40, handles URLs in messages insecurely. PINE allows users to launch a web browser to visit a URL embedded in a message. Due to a programming error, PINE does not properly escape meta-characters in the URL before passing it to the command shell as an argument to the web browser. The pine 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 6000 third-party applications in a ready-to-install format. The ports collection shipped with FreeBSD 4.4 contains this problem since it was discovered after 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 An attacker can supply commands enclosed in single quotes ('') in a URL embedded in a message sent to the victim. If the user then decides to view the URL, PINE will launch a command shell which will then execute the attacker's commands with the victim's privileges. It is possible to obfuscate the URL so that it will not necessarily seem dangerous to the victim. IV. Workaround 1) Deinstall the pine port/package if you have it installed. V. Solution 1) Upgrade your entire ports collection and rebuild the port. 2) Deinstall the old package and install a new package dated after the correction date, obtained from the following directories: [i386] ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/i386/packages-4-stable/mail/pine-4.43.tgz ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/i386/packages-5-current/mail/pine-4.43.tgz [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 pine 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-4-stable/devel/portcheckout-2.0.tgz ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/i386/packages-5-current/devel/portcheckout-2.0.tgz VI. Correction details The following list contains the $FreeBSD$ revision numbers of each file that was corrected in the FreeBSD source Path Revision - - ------------------------------------------------------------------------- ports/mail/pine4/Makefile 1.58 ports/mail/pine4/distinfo 1.18 ports/mail/pine4/files/patch-aa 1.4 ports/mail/pine4/files/patch-ac 1.11 ports/mail/pine4/files/patch-af 1.12 ports/mail/pine4/files/patch-ai 1.11 ports/mail/pine4/files/patch-aj 1.5 ports/mail/pine4/files/patch-ak 1.6 ports/mail/pine4/files/patch-al 1.10 ports/mail/pine4/files/patch-am 1.6 ports/mail/pine4/files/patch-an 1.5 ports/mail/pine4/files/patch-ap 1.3 ports/mail/pine4/files/patch-at 1.6 ports/mail/pine4/files/patch-au 1.4 ports/mail/pine4/files/patch-ax 1.4 ports/mail/pine4/files/patch-az 1.3 ports/mail/pine4/files/patch-be 1.1 ports/mail/pine4/files/patch-bf 1.1 ports/mail/pine4/files/patch-bg 1.1 ports/mail/pine4/files/patch-reply.c 1.2 - - ------------------------------------------------------------------------- - -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.0.6 (FreeBSD) Comment: For info see http://www.gnupg.org iQCVAwUBPDZOCFUuHi5z0oilAQG65gQAjdGuLydxrCswe9trnfOXIKqTkYll/iP7 7atJipzI+RvYjCzNu/nVItCM+jjGSDvSzF1/OUStAUNM2OZY7hqneSPHed8wTyX8 BU7ZNVlLEDsoZc1nWkUpqBkacPLPq6F7k1YbzMO1xVqIzewmXTpaQzmoKNW/ndIO T108lLHqDVE= =Ry2Q - -----END PGP SIGNATURE----- - --------------------------END INCLUDED TEXT-------------------- You have received this e-mail bulletin as a result of your organisation's registration with AusCERT. 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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 iQCVAwUBPDr0mCh9+71yA2DNAQETygP/XZYNKKPELj9FWJXpIChcLFvP9lRmyY7F w1v+W2S+4FeNGlYhLXnLY+2RYpJMXPSip6IJ2GFKbwSicG9xqqJaKxoPJn8w+kYG gxwK6kVSLff/dvh0WMHGINgDqk8Bh6HdrBFYa4JdUijudvLm+wdDZGzdYfQ40Grx F6K5MnXxWuw= =stCS -----END PGP SIGNATURE-----