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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2013.1219 A vulnerability has been discovered in Drupal Core 5 September 2013 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Drupal Publisher: Drupal Operating System: UNIX variants (UNIX, Linux, OSX) Windows Impact/Access: Reduced Security -- Remote/Unauthenticated Resolution: Mitigation Original Bulletin: https://drupal.org/node/2081887 - --------------------------BEGIN INCLUDED TEXT-------------------- PSA-2013-001: Drupal core - Users can insert hidden text and links View online: https://drupal.org/node/2081887 * Advisory ID: PSA-2013-001 * Project: Drupal core [1] * Version: 6.x, 7.x * Date: 2013-September-04 * Security risk: Not critical [2] * Exploitable from: Remote * Vulnerability: Information Disclosure - --------DESCRIPTION--------------------------------------------------------- This is a public service announcement regarding possible insertion of hidden links in comments using core CSS selectors within filtered HTML Text formats ("Input formats" in Drupal 6). Drupal core provides several CSS selectors that, by design, hide elements on the page. Using these selectors it is possible to create links to third-party websites that are hidden within a comment. This technique has been observed on live production websites. Drupal core provides mechanisms that sanitize user submitted links by adding a rel="nofollow" attribute. This feature can be enabled for Drupal 7 sites at admin/config/content/formats/filtered_html and for Drupal 6 sites at admin/settings/filters/1/configure. Note that these paths are for the default formats provided with core. Your site may define custom formats which should be reviewed and updated as well. Careful moderation of user submitted comments is always advised. Additionally, automated comment moderation tools may help to mitigate and flag these malicious comment submissions. - --------SOLUTION------------------------------------------------------------ Review user-submitted content on your site to see if untrusted users have posted content that includes classes. Review those classes to see if they will hide unwanted content. - --------REPORTED BY--------------------------------------------------------- * Aaron Weiss [3] - --------COORDINATED BY------------------------------------------------------ * David Stoline [4] of the Drupal Security Team - --------CONTACT AND MORE INFORMATION---------------------------------------- The Drupal security team can be reached at security at drupal.org or via the contact form at http://drupal.org/contact [5]. Learn more about the Drupal Security team and their policies [6], writing secure code for Drupal [7], and securing your site [8]. [1] http://drupal.org/project/drupal [2] http://drupal.org/security-team/risk-levels [3] http://drupal.org/user/745366 [4] http://drupal.org/user/329570 [5] http://drupal.org/contact [6] http://drupal.org/security-team [7] http://drupal.org/writing-secure-code [8] http://drupal.org/security/secure-configuration - --------------------------END INCLUDED TEXT-------------------- You have received this e-mail bulletin as a result of your organisation's registration with AusCERT. The mailing list you are subscribed to is maintained within your organisation, so if you do not wish to continue receiving these bulletins you should contact your local IT manager. If you do not know who that is, please send an email to auscert@auscert.org.au and we will forward your request to the appropriate person. NOTE: Third Party Rights This security bulletin is provided as a service to AusCERT's members. As AusCERT did not write the document quoted above, AusCERT has had no control over its content. The decision to follow or act on information or advice contained in this security bulletin is the responsibility of each user or organisation, and should be considered in accordance with your organisation's site policies and procedures. AusCERT takes no responsibility for consequences which may arise from following or acting on information or advice contained in this security bulletin. NOTE: This is only the original release of the security bulletin. It may not be updated when updates to the original are made. If downloading at a later date, it is recommended that the bulletin is retrieved directly from the author's website to ensure that the information is still current. Contact information for the authors of the original document is included in the Security Bulletin above. If you have any questions or need further information, please contact them directly. Previous advisories and external security bulletins can be retrieved from: http://www.auscert.org.au/render.html?cid=1980 =========================================================================== Australian Computer Emergency Response Team The University of Queensland Brisbane Qld 4072 Internet Email: auscert@auscert.org.au Facsimile: (07) 3365 7031 Telephone: (07) 3365 4417 (International: +61 7 3365 4417) AusCERT personnel answer during Queensland business hours which are GMT+10:00 (AEST). On call after hours for member emergencies only. =========================================================================== -----BEGIN PGP SIGNATURE----- Comment: http://www.auscert.org.au/render.html?it=1967 iQIVAwUBUifdihLndAQH1ShLAQIynA/+P/nVMY50qKCx1XWNIfOpbHLoKIzOeYUS 244+bHdJoKxxkgaDwXy8BAlH895lSeaXpsIuIqUGKp+ZGlXlJXLdB43RvvNZ3j/k FBT7J4aog/Pr0KuunoS8OnP5I8ImzDzUss1eqmEKg4JoWGRk1XY1lf7q9SXxwz6S F7hVec+WOC5JbHkOiGkL8hS/C9Oy6EwrCYvukiZC6K2fHHCVKYai+4/ctJsRz0gm 5XfZwhzRd9KijmA4bw45H5JctA3SuOQoxm5lUjSG8fu1Z21SoSChGnCJeshm4Fig GUFJHpuMElbfUmjc3WxcptGzYmY9Womm9PjH0/skxni79wUkXLbmqZHqUxLJ6S9Y S/trQNh/67UXKVxkZG6XqlTNQU4jDjhv/Jq2HaxV5qm7J/Arl9nFxR2/A9FtTpCz TeB8C6iaAmf+JcBPSIRTxPO8SBzGCzWU8iSsjl6+lvUDL28Skdb1lvoUa1fVdtNk V9eTt3h+1ttyIN5Ef4e5PsY6m4ya6ty25C2Fd2JKE26MmV2p9kZXaPvPE6vIXXJ2 lz3lbRYyZPYTUBFbNkEXnDv0JLIqwVZXUv9Sdifip//7FDy1wlszTrTiLU+/rcx4 xWJUIgGxd2ZrikEXGiXOl5OjttyD3SKg+mUXuMYag29wHwfAna3gW5p2vNioY4Ip m5/6xYmA8zk= =IhPN -----END PGP SIGNATURE-----