Protect yourself against future threats.
-----BEGIN PGP SIGNED MESSAGE----- =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2002.039 -- FreeBSD-SA-02:05.pine [REVISED] pine port insecure URL handling [REVISED] 21 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 Ref: ESB-2002.008 - --------------------------BEGIN INCLUDED TEXT-------------------- - -----BEGIN PGP SIGNED MESSAGE----- ============================================================================= FreeBSD-SA-02:05 Security Advisory FreeBSD, Inc. Topic: pine port insecure URL handling [REVISED] Category: ports Module: pine Announced: 2002-01-04 Revised: 2002-01-10 Credits: zen-parse <zen-parse@gmx.net> Affects: Ports collection prior to the correction date Corrected: 2002-01-10 16:47:18 UTC FreeBSD only: NO 0. Revision History v1.0 2002-01-04 Initial release. v1.1 2002-01-10 Corrected vulnerable versions and the `Corrected details' section. I. Background PINE is an application for reading mail and news. II. Problem Description The pine port, versions previous to pine-4.44, 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-4.44.tgz ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/i386/packages-5-current/mail/pine-4.44.tgz [alpha] Packages are not automatically generated for the alpha architecture at this time due to lack of build resources. NOTE: It may be several days before updated packages are available. 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 Ports Collection since 4.4-RELEASE. Path Revision - - ------------------------------------------------------------------------- ports/mail/pine4/Makefile 1.61 ports/mail/pine4/distinfo 1.20 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 1.11 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 1.5 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 iQCVAwUBPD3LZlUuHi5z0oilAQH6EAP/bz0Yeydx2zCmQb0j4zmbKM5R8McyKaYb tl/Vo/ViCll6xKXUuAOjFpyIkQMOmHGLwHXmqjJD+XRb0hSgrsCqRmWhUicppZjH dY0zjvtKspbDN37ScOO+MJmGsmq1mfZGs8JUMCbYivDuLhRM/5bvnenUsigNUaQW hkwKI6heurk= =BQ0F - -----END PGP SIGNATURE----- - --------------------------END INCLUDED TEXT-------------------- You have received this e-mail bulletin as a result of your organisation's registration with AusCERT. The mailing list you are subscribed to is maintained within your organisation, so if you do not wish to continue receiving these bulletins you should contact your local IT manager. If you do not know who that is, please send an email to auscert@auscert.org.au and we will forward your request to the appropriate person. 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 iQCVAwUBPEwBhyh9+71yA2DNAQHlfwP+Pwn1V4m0XlTvo2ekZxkaS6DFZBKG8zPj gjeTey3jI3rnBZUK+xf7Heti8LmeWuyW7Nx51w/50NuBxgnNLKseVSK3wVHHwRjX 5q3KNQ93YbJum0VaE3q/5bUj+f1B+QDnJznZgk2iD2TMuE0ZrkYTIEJfD4+eVegU /QaJwK42A0s= =b0/R -----END PGP SIGNATURE-----