(Caldera Issues Fix) Wget FTP Client Input Validation Flaw May Let Malicious Servers Write Files to Arbitrary Locations
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SecurityTracker Alert ID: 1005940 |
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SecurityTracker URL: http://securitytracker.com/id/1005940
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CVE Reference:
CAN-2002-1344
(Links to External Site)
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Date: Jan 17 2003
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Impact:
Modification of system information, Modification of user information
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Fix Available: Yes Vendor Confirmed: Yes
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Version(s): 1.8.1, possibly others
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Description:
An input validation vulnerability was reported in wget's ftp client functionality. A remote FTP server may be able to write files to arbitrary locations when the wget client retrieves files from the FTP server.
Steve Christey reported that a malicious FTP server containing files with specially crafted filenames could exploit a flaw in the wget FTP client. When a target user attempts to download a file from a malicious server, the specially crafted filename may cause the client to create a file or overwrite a file in a directory on the target user's system that is located outside of the current working directory. The write location on the target system is specified by the malicious filename and is subject to the permissions of the target user.
While the target user must request that the malicious file be downloaded, the filename may be obscured or the user may be unaware of the filename (e.g., mget requests).
Several other FTP client implementations are affected [separate Alerts will be issued for each vulnerable client implementation.]
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Impact:
A malicious FTP server may be able to cause the target user's client to write a file being downloaded by the target user to an arbitrary location on the target user's computer.
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Solution:
Caldera has released a fix for Caldera OpenLinux.
OpenLinux 3.1.1 Server:
Package Location
ftp://ftp.sco.com/pub/updates/OpenLinux/3.1.1/Server/CSSA-2003-003.0/RPMS
Packages
0adc5e5568cc589b9ab90ebb0e181e65 wget-1.7.1-3.i386.rpm
Installation
rpm -Fvh wget-1.7.1-3.i386.rpm
Source Package Location
ftp://ftp.sco.com/pub/updates/OpenLinux/3.1.1/Server/CSSA-2003-003.0/SRPMS
Source Packages
b443ec3aa56abaa8236a88bffebba036 wget-1.7.1-3.src.rpm
OpenLinux 3.1.1 Workstation:
Package Location
ftp://ftp.sco.com/pub/updates/OpenLinux/3.1.1/Workstation/CSSA-2003-003.0/RPMS
Packages
d5ef7e346ec79bead0cba20189904a11 wget-1.7.1-3.i386.rpm
Installation
rpm -Fvh wget-1.7.1-3.i386.rpm
Source Package Location
ftp://ftp.sco.com/pub/updates/OpenLinux/3.1.1/Workstation/CSSA-2003-003.0/SRPMS
Source Packages
02c04170cbdef2de1b1f2c1a478681f7 wget-1.7.1-3.src.rpm
OpenLinux 3.1 Server:
Package Location
ftp://ftp.sco.com/pub/updates/OpenLinux/3.1/Server/CSSA-2003-003.0/RPMS
Packages
7c2901898d0cc4d0bbb6132d82fefd0e wget-1.7.1-3.i386.rpm
Installation
rpm -Fvh wget-1.7.1-3.i386.rpm
Source Package Location
ftp://ftp.sco.com/pub/updates/OpenLinux/3.1/Server/CSSA-2003-003.0/SRPMS
Source Packages
b19f59dedcd9b2382a41c8af3cf056d0 wget-1.7.1-3.src.rpm
OpenLinux 3.1 Workstation:
Package Location
ftp://ftp.sco.com/pub/updates/OpenLinux/3.1/Workstation/CSSA-2003-003.0/RPMS
Packages
fbba3488352d9617a0b3b6507633c312 wget-1.7.1-3.i386.rpm
Installation
rpm -Fvh wget-1.7.1-3.i386.rpm
Source Package Location
ftp://ftp.sco.com/pub/updates/OpenLinux/3.1/Workstation/CSSA-2003-003.0/SRPMS
Source Packages
7a30085d938ad07bde1f67267910a71d wget-1.7.1-3.src.rpm
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Vendor URL: www.gnu.org/software/wget/wget.html (Links to External Site)
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Cause:
Input validation error
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Underlying OS:
Linux (Caldera/SCO)
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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: Thu, 16 Jan 2003 13:38:47 -0800
Subject: Security Update: [CSSA-2003.003.0] Linux: wget directory traversal and buffer overrun vulnerabilities
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To: bugtraq@securityfocus.com announce@lists.caldera.com security-alerts@linuxsecurity.com full-disclosure@lists.netsys
______________________________________________________________________________
SCO Security Advisory
Subject: Linux: wget directory traversal and buffer overrun vulnerabilities
Advisory number: CSSA-2003-003.0
Issue date: 2003 January 16
Cross reference:
______________________________________________________________________________
1. Problem Description
Stefano Zacchiroli found a buffer overrun in the url_filename
function, which would make wget segfault on very long urls.
Steven M. Christey discovered that wget did not verify the FTP
server response to a NLST command: it must not contain any
directory information, since that can be used to make a FTP
client overwrite arbitrary files.
2. Vulnerable Supported Versions
System Package
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OpenLinux 3.1.1 Server prior to wget-1.7.1-3.i386.rpm
OpenLinux 3.1.1 Workstation prior to wget-1.7.1-3.i386.rpm
OpenLinux 3.1 Server prior to wget-1.7.1-3.i386.rpm
OpenLinux 3.1 Workstation prior to wget-1.7.1-3.i386.rpm
3. Solution
The proper solution is to install the latest packages. Many
customers find it easier to use the Caldera System Updater, called
cupdate (or kcupdate under the KDE environment), to update these
packages rather than downloading and installing them by hand.
4. OpenLinux 3.1.1 Server
4.1 Package Location
ftp://ftp.sco.com/pub/updates/OpenLinux/3.1.1/Server/CSSA-2003-003.0/RPMS
4.2 Packages
0adc5e5568cc589b9ab90ebb0e181e65 wget-1.7.1-3.i386.rpm
4.3 Installation
rpm -Fvh wget-1.7.1-3.i386.rpm
4.4 Source Package Location
ftp://ftp.sco.com/pub/updates/OpenLinux/3.1.1/Server/CSSA-2003-003.0/SRPMS
4.5 Source Packages
b443ec3aa56abaa8236a88bffebba036 wget-1.7.1-3.src.rpm
5. OpenLinux 3.1.1 Workstation
5.1 Package Location
ftp://ftp.sco.com/pub/updates/OpenLinux/3.1.1/Workstation/CSSA-2003-003.0/RPMS
5.2 Packages
d5ef7e346ec79bead0cba20189904a11 wget-1.7.1-3.i386.rpm
5.3 Installation
rpm -Fvh wget-1.7.1-3.i386.rpm
5.4 Source Package Location
ftp://ftp.sco.com/pub/updates/OpenLinux/3.1.1/Workstation/CSSA-2003-003.0/SRPMS
5.5 Source Packages
02c04170cbdef2de1b1f2c1a478681f7 wget-1.7.1-3.src.rpm
6. OpenLinux 3.1 Server
6.1 Package Location
ftp://ftp.sco.com/pub/updates/OpenLinux/3.1/Server/CSSA-2003-003.0/RPMS
6.2 Packages
7c2901898d0cc4d0bbb6132d82fefd0e wget-1.7.1-3.i386.rpm
6.3 Installation
rpm -Fvh wget-1.7.1-3.i386.rpm
6.4 Source Package Location
ftp://ftp.sco.com/pub/updates/OpenLinux/3.1/Server/CSSA-2003-003.0/SRPMS
6.5 Source Packages
b19f59dedcd9b2382a41c8af3cf056d0 wget-1.7.1-3.src.rpm
7. OpenLinux 3.1 Workstation
7.1 Package Location
ftp://ftp.sco.com/pub/updates/OpenLinux/3.1/Workstation/CSSA-2003-003.0/RPMS
7.2 Packages
fbba3488352d9617a0b3b6507633c312 wget-1.7.1-3.i386.rpm
7.3 Installation
rpm -Fvh wget-1.7.1-3.i386.rpm
7.4 Source Package Location
ftp://ftp.sco.com/pub/updates/OpenLinux/3.1/Workstation/CSSA-2003-003.0/SRPMS
7.5 Source Packages
7a30085d938ad07bde1f67267910a71d wget-1.7.1-3.src.rpm
8. References
Specific references for this advisory:
http://marc.theaimsgroup.com/?l=bugtraq&m=103962838628940&w=2
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2002-1344
http://www.kb.cert.org/vuls/id/210148
SCO security resources:
http://www.sco.com/support/security/index.html
This security fix closes SCO incidents sr872622, fz526854,
erg712181.
9. Disclaimer
SCO is not responsible for the misuse of any of the information
we provide on this website and/or through our security
advisories. Our advisories are a service to our customers intended
to promote secure installation and use of SCO products.
10. Acknowledgements
Stefano Zacchiroli and Steve Christey (coley@mitre.org)
discovered and researched these vulnerabilities.
______________________________________________________________________________
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