[OpenPKG-SA-2003.043] OpenPKG Security Advisory (proftpd)
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OpenPKG Security Advisory The OpenPKG Project
http://www.openpkg.org/security.html http://www.openpkg.org
openpkg-security@xxxxxxxxxxx openpkg@xxxxxxxxxxx
OpenPKG-SA-2003.043 25-Sep-2003
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Package: proftpd
Vulnerability: arbitrary code execution
OpenPKG Specific: no
Affected Releases: Affected Packages: Corrected Packages:
OpenPKG CURRENT <= proftpd-1.2.9rc2-20030911 >= proftpd-1.2.9rc2-20030923
OpenPKG 1.3 <= proftpd-1.2.8-1.3.0 >= proftpd-1.2.8-1.3.1
OpenPKG 1.2 <= proftpd-1.2.7-1.2.0 >= proftpd-1.2.7-1.2.1
Dependent Packages: none
Description:
According to an ISS X-Force security advisory [0], a vulnerability
exists in the ProFTPD FTP server [1], versions between 1.2.7 and
1.2.9rc2 (both inclusive). It can be triggered by remote attackers
when transferring files from the FTP server in ASCII mode.
To trigger the vulnerability, the attacker must have the ability to
first upload a file to the server (not necessarily via FTP), and then
attempt to download the same file via FTP. During ASCII transfer, file
data is examined in 1024 byte chunks to check for newline characters.
The translation of these newline characters is not handled correctly,
and a buffer overflow can manifest if ProFTPD parses a specially
crafted file. The Common Vulnerabilities and Exposures (CVE) project
assigned the id CAN-2003-0831 [2] to the problem.
Please check whether you are affected by running "<prefix>/bin/rpm -q
proftpd". If you have the "proftpd" 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 proftpd-1.2.8-1.3.1.src.rpm
ftp> bye
$ <prefix>/bin/rpm -v --checksig proftpd-1.2.8-1.3.1.src.rpm
$ <prefix>/bin/rpm --rebuild proftpd-1.2.8-1.3.1.src.rpm
$ su -
# <prefix>/bin/rpm -Fvh <prefix>/RPM/PKG/proftpd-1.2.8-1.3.1.*.rpm
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References:
[0] http://xforce.iss.net/xforce/alerts/id/154
[1] http://www.proftpd.org/
[2] http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2003-0831
[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/proftpd-1.2.7-1.2.1.src.rpm
[6] ftp://ftp.openpkg.org/release/1.3/UPD/proftpd-1.2.8-1.3.1.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
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For security reasons, this advisory was digitally signed with the
OpenPGP public key "OpenPKG <openpkg@xxxxxxxxxxx>" (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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