WU-FTPD SKEY authentication buffer overflow
| wuftpd-skey-bo (13518) |  High Risk |
Description:
Washington University's FTP daemon (WU-FTPD), with SKEY support enabled, is vulnerable to a denial of service, caused by a stack-based buffer overflow in the SKEY authentication. A remote attacker could supply a long *name variable to the skey_challenge function to overflow a buffer and possibly execute arbitrary code on the system with root privileges or cause WU-FTPD daemon to crash.
Platforms Affected:
- Compaq, Tru64 5.1a
- Compaq, Tru64 5.1b
- Debian, Debian Linux 3.0
- RedHat, Enterprise Linux 2.1 AS
- RedHat, Enterprise Linux 2.1 ES
- RedHat, Linux Advanced Workstation 2.1 Itanium
- Turbolinux, Turbolinux Advanced Server 6
- Turbolinux, Turbolinux Server 6.1
- Turbolinux, Turbolinux Workstation 6.0
- Washington University, WU-FTPD 2.6.2
Remedy:
For Debian GNU/Linux 3.0 (woody):
Upgrade to the latest wu-ftpd package (2.6.2-3woody4 or later), as listed in DSA-457-1. See References.
For HP Tru64 UNIX 5.1A and 5.1B:
Apply the appropriate Early Release Patches (ERPs) for your system, as listed in Tru64 Security Bulletin: SSRT4704 and SSRT4705. See References.
As a workaround, disable SKEY or apply the unofficial patch, available from the Securiteam Web site. See References.
Consequences:
Gain Access
References:
- CIAC Information Bulletin 0-119, HP Tru64 UNIX WU-FTPD Security Vulnerabilities at http://www.ciac.org/ciac/bulletins/o-119.shtml.
- SecuriTeam Mailing List, UNIX focus 26 Oct 2003, Wu-FTPd SKEY Stack Overflow Vulnerability at http://www.securiteam.com/unixfocus/6X00Q1P8KC.html.
- BID-8893: Wu-Ftpd S/Key Remote Buffer Overrun Vulnerability
- CVE-2004-0185: Buffer overflow in the skey_challenge function in ftpd.c for wu-ftp daemon (wu-ftpd) 2.6.2 allows remote attackers to cause a denial of service and possibly execute arbitrary code via a s/key (SKEY) request with a long name.
- DSA-457: wu-ftpd -- several vulnerabilities
- RHSA-2004-096: wu-ftpd security update
Reported:
Oct 26, 2003
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