[USN-4543-1] Sanitize vulnerability

Avital Ostromich avital.ostromich at canonical.com
Fri Sep 25 17:40:32 UTC 2020

Ubuntu Security Notice USN-4543-1
September 25, 2020

ruby-sanitize vulnerability

A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 20.04 LTS


Sanitize could be made to perform XSS attacks if it received specially
crafted input.

Software Description:
- ruby-sanitize: allowlist-based HTML and CSS sanitizer


MichaƂ Bentkowski discovered that Sanitize did not properly sanitize some
math or svg HTML under certain circumstances. A remote attacker could
potentially exploit this to conduct cross-site scripting (XSS) attacks.

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 20.04 LTS:
  ruby-sanitize                   4.6.6-2.1~

In general, a standard system update will make all the necessary changes.


Package Information:

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