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Host Header Poisoning

Platform: ownCloud Server

Versions: 5.0.15, 6.0.2,

Date: 7/3/2014

Risk level: Medium

Description

Due to trusting user supplied input and interpret it as Host header an attacker is able to craft a password reset mail with a link pointing to his own site. If a user clicks on the link or a software (e.g. antivirus) is accessing the link the attacker is able to reset the user password.

Affected Software

  • ownCloud Server < 6.0.2 (CVE-2014-2047)
  • ownCloud Server < 5.0.15 (CVE-2014-2049)

Action Taken

The new ‘trusted_domain’ setting has been introduced in which all domains from which ownCloud should be accessible has to be specified. A default configuration can be found in config/config.sample.php.

ownCloud will add this configuration setting on its own during an update or a fresh installation using the currently used domain.

Acknowledgements

The ownCloud team thanks the following people for their research and responsible disclosure of the above advisory:

  • Lukas Reschke – ownCloud Inc. (lukas@owncloud.org) – Vulnerability discovery and disclosure.

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