Xtell TTY directory traversal

xtell-tty-directory-traversal (8313) The risk level is classified as LowLow Risk

Description:

The Xtell package could allow a remote attacker to traverse directories on the Web server. A remote attacker can request a URL that uses "dot dot" sequences (../) in the path to traverse directories and write to arbitrary TTY devices.


Consequences:

Gain Access

Remedy:

For Debian GNU/Linux 2.2 (potato):
Upgrade to the latest version of xtell (1.91.1 or later), as listed in DSA 121-1. See References.

For other distributions:
Contact your vendor for upgrade or patch information.

References:

  • BugTraq Mailing List, Wed Feb 27 2002 - 04:31:29 CST: Remote exploit against xtelld and other fun.
  • BID-4194: xtell Trusted TTY Device Name Remote Vulnerability
  • CVE-2002-0333: Directory traversal vulnerability in xtell (xtelld) 1.91.1 and earlier, and 2.x before 2.7, allows remote attackers to read files with short names, and local users to read more files using a symlink with a short name, via a .. in the TTY argument.
  • DSA-121: xtell -- buffer overflow
  • OSVDB ID: 9049: xtell TTY Argument Arbitrary File Access

Platforms Affected:

  • Debian Debian Linux 2.2
  • Xtell Xtell 2.6.1

Reported:

Feb 27, 2002

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