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Liebe Kolleginnen und Kollegen,
soeben erreichte uns nachfolgende Warnung des FreeBSD Security
Officers.Wir geben diese Informationen unveraendert an Sie weiter.
CVE-2008-4247 – Cross-site Request Forgery Schwachstelle in
verschiedenen FTP-Servern
Verschiedene FTP-Server spalten ein (mehr als 512 Zeichen) langes FTP
Kommando in mehrere Kommandos auf. Dies kann z.B. mittels eines sehr
langen FTP URLs dazu ausnutzt werden, ueber einem Browser beliebige
Kommandos an den FTP-Server abzusetzen (Cross-site Request Forgery).
Betroffen sind u.a. die FTP-Server von FreeBSD, NetBSD und OpenBSD.
Betroffen sind die folgenden Software Pakete und Plattformen:
Paket ftpd
FreeBSD Versionen vor den folgenden Erscheinungsdaten
2008-12-23 01:23:09 UTC (RELENG_7, 7.1-PRERELEASE)
2008-12-23 01:23:09 UTC (RELENG_7_1, 7.1-RC2)
2008-12-23 01:23:09 UTC (RELENG_7_0, 7.0-RELEASE-p7)
2008-12-23 01:23:09 UTC (RELENG_6, 6.4-STABLE)
2008-12-23 01:23:09 UTC (RELENG_6_4, 6.4-RELEASE-p1)
2008-12-23 01:23:09 UTC (RELENG_6_3, 6.3-RELEASE-p7)
Vom Hersteller werden ueberarbeitete Pakete zur Verfuegung gestellt.
Hersteller Advisory:
http://security.FreeBSD.org/advisories/FreeBSD-SA-08:12.ftpd.asc
(c) der deutschen Zusammenfassung bei DFN-CERT Services GmbH; die
Verbreitung, auch auszugsweise, ist nur unter Hinweis auf den Urheber,
DFN-CERT Services GmbH, und nur zu nicht kommerziellen Zwecken
gestattet.
Mit freundlichen Gruessen,
Michael Groening, DFN-CERT
– —
Michael Groening (Incident Response Team), +49 40 808077-555
DFN-CERT Services GmbH, https://www.dfn-cert.de, Phone +49 40 808077-555
Sitz / Register: Hamburg, AG Hamburg, HRB 88805, Ust-IdNr.: DE 232129737
Sachsenstrasse 5, 20097 Hamburg/Germany, CEO: Dr. Klaus-Peter Kossakowski
Automatische Warnmeldungen https://www.cert.dfn.de/autowarn
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FreeBSD-SA-08:12.ftpd Security Advisory
The FreeBSD Project
Topic: Cross-site request forgery in ftpd(8)
Category: core
Module: ftpd
Announced: 2008-12-23
Credits: Maksymilian Arciemowicz
Affects: All supported versions of FreeBSD.
Corrected: 2008-12-23 01:23:09 UTC (RELENG_7, 7.1-PRERELEASE)
2008-12-23 01:23:09 UTC (RELENG_7_1, 7.1-RC2)
2008-12-23 01:23:09 UTC (RELENG_7_0, 7.0-RELEASE-p7)
2008-12-23 01:23:09 UTC (RELENG_6, 6.4-STABLE)
2008-12-23 01:23:09 UTC (RELENG_6_4, 6.4-RELEASE-p1)
2008-12-23 01:23:09 UTC (RELENG_6_3, 6.3-RELEASE-p7)
CVE Name: CVE-2008-4247
For general information regarding FreeBSD Security Advisories,
including descriptions of the fields above, security branches, and the
following sections, please visit
I. Background
ftpd(8) is a general-purpose implementation of File Transfer Protocol (FTP)
server that is shipped with the FreeBSD base system. It is not enabled
in default installations but can be enabled as either an inetd(8) server,
or a standard-alone server.
A cross-site request forgery attack is a type of malicious exploit that is
mainly targeted to a web browser, by tricking a user trusted by the site
into visiting a specially crafted URL, which in turn executes a command
which performs some privileged operations on behalf of the trusted user
on the victim site.
II. Problem Description
The ftpd(8) server splits long commands into several requests. This
may result in the server executing a command which is hidden inside
another very long command.
III. Impact
This could, with a specifically crafted command, be used in a
cross-site request forgery attack.
FreeBSD systems running ftpd(8) server could act as a point of privilege
escalation in an attack against users using web browser to access trusted
FTP sites.
IV. Workaround
No workaround is available, but systems not running FTP servers are
not vulnerable. Systems not running the FreeBSD ftp(8) server are not
affected, but users of other ftp daemons are advised to take care
since several other ftp daemons are known to have related bugs.
V. Solution
Perform one of the following:
1) Upgrade your vulnerable system to 6-STABLE, or 7-STABLE, or to the
RELENG_7_1, RELENG_7_0, RELENG_6_4, or RELENG_6_3 security branch
dated after the correction date.
2) To patch your present system:
The following patches have been verified to apply to FreeBSD 6.3, 6.4,
7.0, and 7.1 systems.
a) Download the relevant patch from the location below, and verify the
detached PGP signature using your PGP utility.
# fetch http://security.FreeBSD.org/patches/SA-08:12/ftpd.patch
# fetch http://security.FreeBSD.org/patches/SA-08:12/ftpd.patch.asc
b) Execute the following commands as root:
# cd /usr/src
# patch < /path/to/patch
# cd /usr/src/libexec/ftpd
# make obj && make depend && make && make install
VI. Correction details
The following list contains the revision numbers of each file that was
corrected in FreeBSD.
CVS:
Branch Revision
Path
- - -------------------------------------------------------------------------
RELENG_6
src/libexec/ftpd/ftpcmd.y 1.64.2.3
src/libexec/ftpd/extern.h 1.19.14.1
src/libexec/ftpd/ftpd.c 1.206.2.4
RELENG_6_4
src/UPDATING 1.416.2.40.2.4
src/sys/conf/newvers.sh 1.69.2.18.2.7
src/libexec/ftpd/ftpcmd.y 1.64.2.2.4.2
src/libexec/ftpd/extern.h 1.19.30.2
src/libexec/ftpd/ftpd.c 1.206.2.3.4.2
RELENG_6_3
src/UPDATING 1.416.2.37.2.12
src/sys/conf/newvers.sh 1.69.2.15.2.11
src/libexec/ftpd/ftpcmd.y 1.64.2.2.2.1
src/libexec/ftpd/extern.h 1.19.26.1
src/libexec/ftpd/ftpd.c 1.206.2.3.2.1
RELENG_7
src/libexec/ftpd/ftpcmd.y 1.66.2.1
src/libexec/ftpd/extern.h 1.19.24.1
src/libexec/ftpd/ftpd.c 1.212.2.1
RELENG_7_1
src/UPDATING 1.507.2.13.2.2
src/libexec/ftpd/ftpcmd.y 1.66.6.2
src/libexec/ftpd/extern.h 1.19.32.2
src/libexec/ftpd/ftpd.c 1.212.6.2
RELENG_7_0
src/UPDATING 1.507.2.3.2.11
src/sys/conf/newvers.sh 1.72.2.5.2.11
src/libexec/ftpd/ftpcmd.y 1.66.4.1
src/libexec/ftpd/extern.h 1.19.28.1
src/libexec/ftpd/ftpd.c 1.212.4.1
- - -------------------------------------------------------------------------
Subversion:
Branch/path Revision
- - -------------------------------------------------------------------------
stable/6/ r186405
releng/6.4/ r186405
releng/6.3/ r186405
stable/7/ r186405
releng/7.1/ r186405
releng/7.0/ r186405
- - -------------------------------------------------------------------------
VII. References
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-4247
The latest revision of this advisory is available at
http://security.FreeBSD.org/advisories/FreeBSD-SA-08:12.ftpd.asc
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