(Conectiva Issues Fix) ProFTPD ASCII Mode File Upload Buffer Overflow Lets Certain Remote Users Execute Arbitrary Code
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SecurityTracker Alert ID: 1007856 |
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SecurityTracker URL: http://securitytracker.com/id/1007856
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CVE Reference:
CAN-2003-0831
(Links to External Site)
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Date: Oct 1 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:
Conectiva has released a fix:
ftp://atualizacoes.conectiva.com.br/9/RPMS/proftpd-1.2.7-27285U90_2cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/9/RPMS/proftpd-doc-1.2.7-27285U90_2cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/9/SRPMS/proftpd-1.2.7-27285U90_2cl.src.rpm
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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 (Conectiva)
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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: Mon, 29 Sep 2003 15:07:04 -0300
Subject: [conectiva-updates] [CLA-2003:750] Conectiva Security Announcement - proftpd
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-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1
- --------------------------------------------------------------------------
CONECTIVA LINUX SECURITY ANNOUNCEMENT
- --------------------------------------------------------------------------
PACKAGE : proftpd
SUMMARY : Remote vulnerability
DATE : 2003-09-29 15:03:00
ID : CLA-2003:750
RELEVANT
RELEASES : 9
- -------------------------------------------------------------------------
DESCRIPTION
ProFTPD is a highly configurable FTP daemon written from scratch for
Unix and Unix-like operating systems.
ISS X-Force has discovered a vulnerability[1] in the way proftpd
(versions >= 1.2.7) handles incoming ASCII file transfers. An
attacker who is able to upload and download the same file can exploit
this vulnerability to execute arbitrary code with root privileges.
The Common Vulnerabilities and Exposures project (cve.mitre.org) has
assigned the name CAN-2003-0831 to this issue[2].
SOLUTION
All proftpd users should upgrade.
Please note that after the upgrade the proftpd process will be
automatically restarted if it is already running. It is recommended
that administrators shut down all current connections (which will be
using the vulnerable copy) to avoid a possible abuse by currently
connected users.
REFERENCES:
1.http://xforce.iss.net/xforce/alerts/id/154
2.http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2003-0831
UPDATED PACKAGES
ftp://atualizacoes.conectiva.com.br/9/RPMS/proftpd-1.2.7-27285U90_2cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/9/RPMS/proftpd-doc-1.2.7-27285U90_2cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/9/SRPMS/proftpd-1.2.7-27285U90_2cl.src.rpm
ADDITIONAL INSTRUCTIONS
The apt tool can be used to perform RPM packages upgrades:
- run: apt-get update
- after that, execute: apt-get upgrade
Detailed instructions reagarding the use of apt and upgrade examples
can be found at http://distro.conectiva.com.br/atualizacoes/#apt?idioma=en
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All packages are signed with Conectiva's GPG key. The key and instructions
on how to import it can be found at
http://distro.conectiva.com.br/seguranca/chave/?idioma=en
Instructions on how to check the signatures of the RPM packages can be
found at http://distro.conectiva.com.br/seguranca/politica/?idioma=en
- -------------------------------------------------------------------------
All our advisories and generic update instructions can be viewed at
http://distro.conectiva.com.br/atualizacoes/?idioma=en
- -------------------------------------------------------------------------
Copyright (c) 2003 Conectiva Inc.
http://www.conectiva.com
- -------------------------------------------------------------------------
subscribe: conectiva-updates-subscribe@papaleguas.conectiva.com.br
unsubscribe: conectiva-updates-unsubscribe@papaleguas.conectiva.com.br
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