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OpenPKG Security Advisory The OpenPKG Project
http://www.openpkg.org/security.html http://www.openpkg.org
openpkg-security@openpkg.org openpkg@openpkg.org
OpenPKG-SA-2003.053 17-Dec-2003
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Package: lftp
Vulnerability: arbitrary code execution
OpenPKG Specific: no
Affected Releases: Affected Packages: Corrected Packages:
OpenPKG CURRENT <= lftp-2.6.9-20031120 >= lftp-2.6.10-20031211
OpenPKG 1.3 <= lftp-2.6.6-1.3.0 >= lftp-2.6.6-1.3.1
OpenPKG 1.2 <= lftp-2.6.4-1.2.0 >= lftp-2.6.4-1.2.1
Dependent Packages: none
Description:
According to a security advisory from Ulf Härnhammar [0], a buffer
overflow bug exists in the FTP/HTTP/HTTPS client LFTP [1] bug in
versions up to and including 2.6.9. An attacker could create a
carefully crafted directory on a website such that, if a user connects
to that directory using the LFTP client and subsequently issues a "ls"
or "rels" command, the attacker could execute arbitrary code on the
users machine. The Common Vulnerabilities and Exposures (CVE) project
assigned the id CAN-2003-0963 [2] to the problem.
Please check whether you are affected by running "/bin/rpm -q
lftp". If you have the "lftp" package installed and its version is
affected (see above), we recommend that you immediately upgrade it
(see Solution) [3][4].
Solution:
Select the updated source RPM appropriate for your OpenPKG release
[5][6], fetch it from the OpenPKG FTP service [7][8] or a mirror
location, verify its integrity [9], build a corresponding binary RPM
from it [3] and update your OpenPKG installation by applying the binary
RPM [4]. For the current release OpenPKG 1.3, perform the following
operations to permanently fix the security problem (for other releases
adjust accordingly).
$ ftp ftp.openpkg.org
ftp> bin
ftp> cd release/1.3/UPD
ftp> get lftp-2.6.6-1.3.1.src.rpm
ftp> bye
$ /bin/rpm -v --checksig lftp-2.6.6-1.3.1.src.rpm
$ /bin/rpm --rebuild lftp-2.6.6-1.3.1.src.rpm
$ su -
# /bin/rpm -Fvh /RPM/PKG/lftp-2.6.6-1.3.1.*.rpm
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References:
[0] http://www.securityfocus.com/archive/1/347587/2003-12-13/2003-12-19 /0
[1] http://lftp.yar.ru/
[2] http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2003-0963
[3] http://www.openpkg.org/tutorial.html#regular-source
[4] http://www.openpkg.org/tutorial.html#regular-binary
[5] ftp://ftp.openpkg.org/release/1.2/UPD/lftp-2.6.4-1.2.1.src.rpm
[6] ftp://ftp.openpkg.org/release/1.3/UPD/lftp-2.6.6-1.3.1.src.rpm
[7] ftp://ftp.openpkg.org/release/1.2/UPD/
[8] ftp://ftp.openpkg.org/release/1.3/UPD/
[9] http://www.openpkg.org/security.html#signature
________________________________________________________________________
For security reasons, this advisory was digitally signed with the
OpenPGP public key "OpenPKG " (ID 63C4CB9F) of the
OpenPKG project which you can retrieve from http://pgp.openpkg.org and
hkp://pgp.openpkg.org. Follow the instructions on http://pgp.openpkg.org/
for details on how to verify the integrity of this advisory.
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