ruby-sanitize: Cross-site Scripting -- Remote/Unauthenticated

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2020.3310
                    USN-4543-1: Sanitize vulnerability
                             28 September 2020

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        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           ruby-sanitize
Publisher:         Ubuntu
Operating System:  Ubuntu
Impact/Access:     Cross-site Scripting -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2020-4054  

Reference:         ESB-2020.2450

Original Bulletin: 
   https://usn.ubuntu.com/4543-1/

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USN-4543-1: Sanitize vulnerability
25 September 2020

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

  o Ubuntu 20.04 LTS

Packages

  o ruby-sanitize - allowlist-based HTML and CSS sanitizer

Details

Michal 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.
(CVE-2020-4054)

Update instructions

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

Ubuntu 20.04

  o ruby-sanitize - 4.6.6-2.1~0.20.04.1

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

References

  o CVE-2020-4054

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