[ SOURCE: http://www.secureroot.com/security/advisories/9693908141.html ] -----BEGIN PGP SIGNED MESSAGE----- ============================================================================= FreeBSD-SA-00:47 Security Advisory FreeBSD, Inc. Topic: pine4 port allows denial of service Category: ports Module: pine4 Announced: 2000-09-13 Affects: Ports collection. Corrected: 2000-07-17 Credits: Juhapekka Tolvanen Vendor status: Contacted FreeBSD only: NO I. Background Pine is a popular mail user agent. II. Problem Description The pine4 port, versions 4.21 and before, contained a bug which would cause the program to crash when processing a folder which contains an email message with a malformed X-Keywords header. The message itself could be deleted within pine if identified, but other operations such as closing the folder with the message still present would cause the program to crash with no apparent cause, discarding changes to the mailbox. The FreeBSD port of pine4 was changed on 2000-07-17 to use an updated version of the c-client library which is used to handle the mailbox processing. This library does not contain the bug and versions of pine4 built with it (i.e. ports or packages dated after the correction date) do not suffer from this vulnerability. The pine4 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 3800 third-party applications in a ready-to-install format. The ports collections shipped with FreeBSD 4.1 and 3.5.1 contain this problem since it was discovered after the releases. 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 Remote users can cause pine4 to crash when closing a mail folder by sending a malformed email. If you have not chosen to install the pine4 port/package, then your system is not vulnerable to this problem. IV. Workaround Deinstall the pine4 port/package, if you have installed it. It may be possible to use a mail filtering utility such as procmail (available in FreeBSD ports as /usr/ports/mail/procmail) to filter out the malformed X-Keywords header from incoming mail, but this solution is not discussed here. V. Solution One of the following: 1) Upgrade your entire ports collection and rebuild the pine4 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/mail/pine-4.21.tgz ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/i386/packages-4-stable/mail/pine-4.21.tgz ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/alpha/packages-4-stable/mail/pine-4.21.tgz ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/i386/packages-5-current/mail/pine-4.21.tgz ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/alpha/packages-5-current/mail/pine-4.21.tgz NOTE: Be sure to check the file creation date on the package, because the version number of the software has not changed. 3) download a new port skeleton for the listmanager 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 iQCVAwUBOb/kgFUuHi5z0oilAQEwgAQAnYgLOfvgfM88DLjUXgoZBkVRoroeU8rz 2DXUw4LEQ6ARzruWPepALW2Yls+g5SraDCLHmuTo6tb3vR6kwQ97gQmzNCNDxK9T /5m4EFYo2ErTOB4nO/MqepJ+/0t4oBPByhaRjQBSqQncaN4FIkWgboqfpbYdL6HC cnQSlc+0FPs= =R2n+ -----END PGP SIGNATURE-----