Opera Telnet file overwrite

opera-telnet-file-overwrite (16139) The risk level is classified as MediumMedium Risk


Opera could allow a remote attacker to create or overwrite arbitrary files on the system. By creating a specially-crafted Telnet URL containing a dash (-) character prior to the hostname and followed by a command option, a remote attacker could create or overwrite files on the vulnerable system, once the URL is clicked.


File Manipulation


Upgrade to the latest version of Opera (7.50 or later), available from the Opera Web site. See References.


  • iDEFENSE Security Advisory 05.12.04: Opera Telnet URI Handler File Creation/Truncation Vulnerability .
  • Opera Web site: Opera Internet Browser.
  • BID-10341: Multiple Vendor URI Protocol Handler Arbitrary File Creation/Modification Vulnerability
  • CVE-2004-0473: Argument injection vulnerability in Opera before 7.50 does not properly filter - characters that begin a hostname in a telnet URI, which allows remote attackers to insert options to the resulting command line and overwrite arbitrary files via (1) the -f option on Windows XP or (2) the -n option on Linux.
  • GLSA-200405-19: Opera telnet URI handler file creation/truncation vulnerability
  • SECTRACK ID: 1010142: Opera Telnet URL Processing Flaw Lets Remote Users Create or Overwrite Files

Platforms Affected:

  • Gentoo Linux
  • Opera Opera Browser 7.23


May 12, 2004

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