WU-FTPD SKEY authentication buffer overflow

wuftpd-skey-bo (13518) The risk level is classified as HighHigh Risk


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.


Gain Access


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.


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


Oct 26, 2003

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