FTP CWD buffer overflow

ftp-servu (205)

Medium Risk

Description:

FTP Serv-U is vulnerable to a denial of service attack caused by a buffer overflow in the CWD command. By sending an argument to the CWD command containing a string of 155 characters or more, a remote attacker can overflow a buffer and crash the server or execute arbitrary code on the system.

Consequences:

Remedy:

Upgrade to the latest version of Serv-U (3.1 or later), available from the Serv-U Web site. See References.

References:

• BugTraq Mailing List, 1999-05-03 4:16:38: Buffer Overflows in FTP Serv-U 2.5.
• Serv-U Web site: Serv-U¿ 3.1 is Released!.
• BID-269: Cat Soft Serv-U Buffer Overflow Vulnerabilities
• CVE-1999-0219: Buffer overflow in FTP Serv-U 2.5 allows remote authenticated users to cause a denial of service (crash) via a long (1) CWD or (2) LS (list) command.

Platforms Affected:

• Apple Mac OS
• Cisco IOS
• Compaq Tru64
• Data General DG/UX
• HP HP-UX
• IBM AIX
• IBM OS2
• IETF FTP
• Linux Kernel
• Microsoft Windows 2000
• Microsoft Windows 2003 Server
• Microsoft Windows 95
• Microsoft Windows 98
• Microsoft Windows 98SE
• Microsoft Windows Me
• Microsoft Windows NT 4.0
• Microsoft Windows XP
• Novell NetWare
• Rhino Software Serv-U FTP Server 2.5
• SCO SCO Unix
• SGI IRIX
• Sun Solaris
• WindRiver BSDOS

Reported:

Jul 01, 1997

The information within this database may change without notice. Use of this information constitutes acceptance for use in an AS IS condition. There are NO warranties, implied or otherwise, with regard to this information or its use. Any use of this information is at the user's risk. In no event shall the author/distributor (IBM Internet Security Systems X-Force) be held liable for any damages whatsoever arising out of or in connection with the use or spread of this information.

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