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AUSCERT External Security Bulletin Redistribution
Bootstrap - Moderately critical - Cross site scripting
29 November 2018
AusCERT Security Bulletin Summary
Product: Drupal Bootstrap
Operating System: UNIX variants (UNIX, Linux, OSX)
Impact/Access: Cross-site Scripting -- Remote with User Interaction
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Bootstrap - Moderately critical - Cross site scripting - SA-CONTRIB-2018-074
Security risk: Moderately critical 11/25
Vulnerability: Cross site scripting
This base theme bridges the gap between Drupal and the Bootstrap Framework.
The theme doesn't sufficiently filter valid targets under the scenario of
opening modals, popovers, and tooltips.
This vulnerability is mitigated by the fact that an attacker must already have
the ability to either:
1. Edit/save custom content that supplies a value for the data-target
attribute by injecting malicious code.
2. Inject custom markup onto the page that further exploits the data-target
attribute by injecting malicious code. This method of attack is highly
unlikely if they already have this level of access.
Note: while the base-theme does not provide either of these opportunities to do
this out-of-the-box; a custom sub-theme may, however, be susceptible if it
didn't sanitize or filter user provided input for XSS properly.
Install the latest version and take additional manual steps (see below).
o If you use the Drupal Bootstrap base-theme for Drupal 7.x, upgrade to
o If you use the Drupal Bootstrap base-theme for Drupal 8.x, upgrade to
The vulnerability fixed in the Bootstrap theme releases on Drupal.org is a
external framework's vulnerability was first reported in a public issue and
later a fix for this vulnerability was merged into the external framework,
however an official release of the external framework has yet to be made.
Users of this theme should take two additional steps:
1. Follow this external framework issue for further information and to keep
up-to-date on when you need to upgrade your sub-theme's external framework
source. You may consider using the distributed files from the temporary
branch master-xmr-v3-fixes until an official release is made.
2. Review any custom code on your site that might have copied from the
external framework's vulnerable code.
Also see the Bootstrap project page.
o Mark Carver
o Greg Knaddison of the Drupal Security Team
Samuel Mortenson of the Drupal Security Team
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