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AUSCERT External Security Bulletin Redistribution
USN-4089-1: Rack vulnerability
9 August 2019
AusCERT Security Bulletin Summary
Operating System: Ubuntu
Impact/Access: Cross-site Scripting -- Remote with User Interaction
CVE Names: CVE-2018-16471
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USN-4089-1: Rack vulnerability
7 August 2019
A security issue affects these releases of Ubuntu and its derivatives:
o Ubuntu 18.04 LTS
o Ubuntu 16.04 LTS
Rack could allow cross-site scripting (XSS) attacks.
o ruby-rack - modular Ruby webserver interface
It was discovered that Rack incorrectly handled carefully crafted requests. A
remote attacker could use this issue to execute a cross-site scripting (XSS)
The problem can be corrected by updating your system to the following package
Ubuntu 18.04 LTS
ruby-rack - 1.6.4-4ubuntu0.1
Ubuntu 16.04 LTS
ruby-rack - 1.6.4-3ubuntu0.1
To update your system, please follow these instructions: https://
In general, a standard system update will make all the necessary changes.
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