(Sun Issues T-Patches) WU-FTPD wu_fnmatch() Globbing Error Lets Remote Users Deny Service
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SecurityTracker Alert ID: 1014042 |
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SecurityTracker URL: http://securitytracker.com/id/1014042
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CVE Reference:
CVE-2005-0256
(Links to External Site)
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Date: May 24 2005
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Impact:
Denial of service via network
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Fix Available: Yes Vendor Confirmed: Yes
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Version(s): 2.6.1, 2.6.2; possibly earlier versions
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Description:
iDEFENSE reported a vulnerability in WU-FTPD. A remote authenticated user can cause denial of service conditions.
The wu_fnmatch() function in 'wu_fnmatch.c' does not properly process strings containing an asterik ('*') character. A remote authenticated user can supply a string with a large number of asterik characters to cause the target system to consume excessive resources.
A demonstration exploit command is provided:
ftp> dir ***************************************************************
***************************************************************
***************************************************************
**.*
The vendor was notified on February 9, 2005, without response.
Adam Zabrocki (pi3 / pi3ki31ny) discovered this vulnerability.
The original advisory is available at:
http://www.idefense.com/application/poi/display?id=207&type=vulnerabilities
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Impact:
A remote user can cause the ftp daemon to consume excessive resources on the target system.
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Solution:
Sun has issued preliminary T-patches for Solaris 9, available at:
http://sunsolve.sun.com/tpatches
SPARC
* Solaris 9 T-patch T114564-05
x86 Platform
* Solaris 9 T-patch T114565-05
Solaris 7 and 8 are not affected. Solaris 10 is vulnerable. For Solaris 10, the vendor has described a workaround in their advisory at:
http://sunsolve.sun.com/search/document.do?assetkey=1-26-57795-1
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Vendor URL: sunsolve.sun.com/search/document.do?assetkey=1-26-57795-1 (Links to External Site)
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Cause:
Input validation error
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Underlying OS:
UNIX (Solaris - SunOS)
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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, 24 May 2005 00:56:33 -0400
Subject: http://sunsolve.sun.com/search/document.do?assetkey=1-26-57795-1
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# Sun Alert ID: 57795
# Synopsis: Security Vulnerability in the WU-FTPD "wu_fnmatch" Function May Result in a Denial of Service (DoS)
# Category: Security
# Product: Solaris
# BugIDs: 6239487
# Avoidance: Workaround, T-Patch
# State: Engineering Complete
# Date Released: 20-May-2005
# Date Closed:
# Date Modified: 23-May-2005
CVE: CAN-2005-0256
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