(Slackware Issues Fix) ProFTPD ASCII Mode File Upload Buffer Overflow Lets Certain Remote Users Execute Arbitrary Code
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SecurityTracker Alert ID: 1007807 |
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SecurityTracker URL: http://securitytracker.com/id/1007807
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CVE Reference:
GENERIC-MAP-NOMATCH
(Links to External Site)
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Date: Sep 25 2003
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Impact:
Execution of arbitrary code via network, Root access via network
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Fix Available: Yes Vendor Confirmed: Yes
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Version(s): Confirmed on 1.2.7, 1.2.8, 1.2.8rc1, 1.2.8rc2, 1.2.9rc1, and 1.2.9rc2
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Description:
A buffer overflow vulnerability was reported in the ProFTPD FTP server. A remote user with upload privileges may be able to obtain root access on the target system.
Internet Security Systems reported that there is a flaw in the processing of inbound ASCII file transfers. A remote user with upload privileges can upload a specially crafted file in ASCII mode and then attempt to download the file to trigger the buffer overflow and execute arbitrary code. The remote user can bypass ProFTPD security checks to cause the code to execute with root level privileges, the report said.
According to the report, the flaw resides in the translation of newline characters.
The CVE number CAN-2003-0831 has been assigned to this issue.
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Impact:
A remote user with file upload privileges can execute arbitrary code on the target system with root privileges.
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Solution:
Slackware has released a fix in version 1.2.8p (patched).
Updated package for Slackware 8.1:
ftp://ftp.slackware.com/pub/slackware/slackware-8.1/patches/packages/proftpd-1.2.8p-i386-1.tgz
Updated package for Slackware 9.0:
ftp://ftp.slackware.com/pub/slackware/slackware-9.0/patches/packages/proftpd-1.2.8p-i386-1.tgz
Updated package for Slackware -current:
ftp://ftp.slackware.com/pub/slackware/slackware-current/slackware/n/proftpd-1.2.8p-i486-1.tgz
The MD5 Signatures are:
Slackware 8.1 package:
8b31d10bab91a0d4a22c7eac69a90087 proftpd-1.2.8p-i386-1.tgz
Slackware 9.0 package:
391d5e24bade1ff98281465d230ddad5 proftpd-1.2.8p-i386-1.tgz
Slackware -current package:
2636a2306a6acb0d8726995de9013678 proftpd-1.2.8p-i486-1.tgz
To install, use upgradepkg (as root):
# upgradepkg proftpd-1.2.8p-i386-1.tgz
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Vendor URL: www.proftpd.org/ (Links to External Site)
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Cause:
Boundary error
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Underlying OS:
Linux (Slackware)
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Message History:
This archive entry is a follow-up to the message listed below.
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Source Message Contents
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Date: Tue, 23 Sep 2003 23:06:38 -0700 (PDT)
Subject: [slackware-security] ProFTPD Security Advisory (SSA:2003-259-02)
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-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1
[slackware-security] ProFTPD Security Advisory (SSA:2003-259-02)
Upgraded ProFTPD packages are available for Slackware 8.1, 9.0 and
- -current. These fix a security issue where an attacker could gain
a root shell by downloading a specially crafted file.
Here are the details from the Slackware 9.0 ChangeLog:
+--------------------------+
Tue Sep 23 14:43:10 PDT 2003
n/proftpd-1.2.8p-i486-1.tgz: Upgraded to proftpd-1.2.8p (patched).
This fixes a security problem in ProFTPD. From http://www.proftpd.org:
X-Force Research at ISS has discovered a remote exploit in ProFTPD's
handling of ASCII translations that an attacker, by downloading a
carefully crafted file, can exploit and gain a root shell. The source
distributions on ftp.proftpd.org have all been replaced with patched
versions. All ProFTPD users are strongly urged to upgrade to one of
the patched versions as soon as possible.
Note that the upgraded package does not change the displayed version
number to 1.2.8p (it remains 1.2.8), but we've verified the source code
to make sure that this is in fact the patched version. We recommend all
sites running ProFTPD upgrade to the new package right away.
(* Security fix *)
+--------------------------+
WHERE TO FIND THE NEW PACKAGES:
+-----------------------------+
Updated package for Slackware 8.1:
ftp://ftp.slackware.com/pub/slackware/slackware-8.1/patches/packages/proftpd-1.2.8p-i386-1.tgz
Updated package for Slackware 9.0:
ftp://ftp.slackware.com/pub/slackware/slackware-9.0/patches/packages/proftpd-1.2.8p-i386-1.tgz
Updated package for Slackware -current:
ftp://ftp.slackware.com/pub/slackware/slackware-current/slackware/n/proftpd-1.2.8p-i486-1.tgz
MD5 SIGNATURES:
+-------------+
Slackware 8.1 package:
8b31d10bab91a0d4a22c7eac69a90087 proftpd-1.2.8p-i386-1.tgz
Slackware 9.0 package:
391d5e24bade1ff98281465d230ddad5 proftpd-1.2.8p-i386-1.tgz
Slackware -current package:
2636a2306a6acb0d8726995de9013678 proftpd-1.2.8p-i486-1.tgz
INSTALLATION INSTRUCTIONS:
+------------------------+
Upgrade using upgradepkg (as root):
# upgradepkg proftpd-1.2.8p-i386-1.tgz
+-----+
Slackware Linux Security Team
http://slackware.com/gpg-key
security@slackware.com
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