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AUSCERT External Security Bulletin Redistribution
USN-4561-2: Rack vulnerabilities
7 April 2021
AusCERT Security Bulletin Summary
Operating System: Ubuntu
Impact/Access: Access Confidential Data -- Remote/Unauthenticated
Unauthorised Access -- Remote/Unauthenticated
CVE Names: CVE-2020-8184 CVE-2020-8161
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USN-4561-2: Rack vulnerabilities
06 April 2021
Rack could be made to expose sensitive information over the network.
o Ubuntu 20.10
o Ubuntu 20.04 LTS
o Ubuntu 16.04 LTS
o ruby-rack - modular Ruby webserver interface
USN-4561-1 fixed vulnerabilities in Rack. This update provides the
corresponding update for Ubuntu 16.04 LTS, Ubuntu 20.04 LTS and Ubuntu 20.10.
Original advisory details:
It was discovered that Rack incorrectly handled certain paths. An attacker
could possibly use this issue to obtain sensitive information. This issue
only affected Ubuntu 16.04 LTS, Ubuntu 18.04 LTS and Ubuntu 20.04 LTS.
( CVE-2020-8161 )
It was discovered that Rack incorrectly validated cookies. An attacker
could possibly use this issue to forge a secure cookie. ( CVE-2020-8184 )
The problem can be corrected by updating your system to the following package
o ruby-rack - 2.1.1-5ubuntu0.1
o ruby-rack - 2.0.7-2ubuntu0.1
o ruby-rack - 1.6.4-3ubuntu0.2
In general, a standard system update will make all the necessary changes.
o USN-4561-1 : ruby-rack
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