3571e53040
patches for easier mirroring, to eliminate a special copy, to make www.freebsd.org/security a full copy of security.freebsd.org and be eventually be the same. For now files are just sitting there. The symlinks are missing. Discussed on: www (repository location) Discussed with: simon (so)
94 lines
3.2 KiB
Text
94 lines
3.2 KiB
Text
-----BEGIN PGP SIGNED MESSAGE-----
|
|
|
|
=============================================================================
|
|
FreeBSD-SA-01:43 Security Advisory
|
|
FreeBSD, Inc.
|
|
|
|
Topic: fetchmail contains potentially exploitable buffer
|
|
overflow
|
|
|
|
Category: ports
|
|
Module: fetchmail
|
|
Announced: 2001-07-10
|
|
Credits: Wolfram Kleff <kleff@cs.uni-bonn.de>
|
|
Affects: Ports collection prior to the correction date.
|
|
Corrected: 2001-06-15
|
|
Vendor status: Updated version released
|
|
FreeBSD only: NO
|
|
|
|
I. Background
|
|
|
|
fetchmail is a program used to retrieve email from POP and IMAP
|
|
servers.
|
|
|
|
II. Problem Description
|
|
|
|
The fetchmail port, versions prior to fetchmail-5.8.6, contains a
|
|
potentially exploitable buffer overflow when rewriting headers
|
|
longer than 512 bytes. This problem may allow remote users to
|
|
cause fetchmail to crash and potentially execute arbitrary code
|
|
as the user running fetchmail.
|
|
|
|
The fetchmail 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 5400 third-party applications in a ready-to-install
|
|
format. The ports collection shipped with FreeBSD 4.3 is vulnerable
|
|
to this problem since it was discovered after its 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
|
|
|
|
Remote users using specially crafted email messages may be able to
|
|
cause fetchmail to crash and potentially execute arbitrary code as
|
|
the user running fetchmail.
|
|
|
|
If you have not chosen to install the fetchmail port/package, then
|
|
your system is not vulnerable to this problem.
|
|
|
|
IV. Workaround
|
|
|
|
Deinstall the fetchmail port/package if you have installed it.
|
|
|
|
V. Solution
|
|
|
|
One of the following:
|
|
|
|
1) Upgrade your entire ports collection and rebuild the fetchmail 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/fetchmail-5.8.6.tgz
|
|
ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/i386/packages-5-current/mail/fetchmail-5.8.6.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 fetchmail 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
|
|
|
|
-----BEGIN PGP SIGNATURE-----
|
|
Version: GnuPG v1.0.6 (FreeBSD)
|
|
Comment: FreeBSD: The Power To Serve
|
|
|
|
iQCVAwUBO0sNt1UuHi5z0oilAQH3NAP/aozGB400MgGyT/mndBk39Y1tD1aPR1AN
|
|
yDUG+ddeiskXWjR2UNUd3hqQNJ/8LNMqty8MYOVDB+4S+Pvk4MS2iXcW/4r8yPuT
|
|
2V0FfHos3ytxk/mujf7IlVhwp3fnGCFJpFJatgbhUUoU8gakl8BfR87zT77RbiDQ
|
|
OuGG+fpBKEw=
|
|
=zCcz
|
|
-----END PGP SIGNATURE-----
|