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AUSCERT External Security Bulletin Redistribution
ESB-2021.1150
USN-4561-2: Rack vulnerabilities
7 April 2021
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AusCERT Security Bulletin Summary
---------------------------------
Product: Rack
Publisher: Ubuntu
Operating System: Ubuntu
Impact/Access: Access Confidential Data -- Remote/Unauthenticated
Unauthorised Access -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2020-8184 CVE-2020-8161
Reference: ESB-2020.3928
ESB-2020.3841
ESB-2020.3414
Original Bulletin:
https://ubuntu.com/security/notices/USN-4561-2
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USN-4561-2: Rack vulnerabilities
06 April 2021
Rack could be made to expose sensitive information over the network.
Releases
o Ubuntu 20.10
o Ubuntu 20.04 LTS
o Ubuntu 16.04 LTS
Packages
o ruby-rack - modular Ruby webserver interface
Details
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 )
Update instructions
The problem can be corrected by updating your system to the following package
versions:
Ubuntu 20.10
o ruby-rack - 2.1.1-5ubuntu0.1
Ubuntu 20.04
o ruby-rack - 2.0.7-2ubuntu0.1
Ubuntu 16.04
o ruby-rack - 1.6.4-3ubuntu0.2
In general, a standard system update will make all the necessary changes.
References
o CVE-2020-8161
o CVE-2020-8184
Related notices
o USN-4561-1 : ruby-rack
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