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AUSCERT External Security Bulletin Redistribution
ESB-2019.4477
USN-4201-1: Ruby vulnerabilities
27 November 2019
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AusCERT Security Bulletin Summary
---------------------------------
Product: Ruby
Publisher: Ubuntu
Operating System: Ubuntu
Impact/Access: Execute Arbitrary Code/Commands -- Remote/Unauthenticated
Denial of Service -- Remote/Unauthenticated
Provide Misleading Information -- Remote/Unauthenticated
Reduced Security -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2019-16255 CVE-2019-16254 CVE-2019-16201
CVE-2019-15845
Reference: ESB-2019.4448
ESB-2019.3678
Original Bulletin:
https://usn.ubuntu.com/4201-1/
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USN-4201-1: Ruby vulnerabilities
26 November 2019
ruby2.3, ruby2.5 vulnerabilities
A security issue affects these releases of Ubuntu and its derivatives:
o Ubuntu 19.10
o Ubuntu 19.04
o Ubuntu 18.04 LTS
o Ubuntu 16.04 LTS
Summary
Several security issues were fixed in Ruby.
Software Description
o ruby2.5 - Interpreter of object-oriented scripting language Ruby
o ruby2.3 - Object-oriented scripting language
Details
It was discovered that Ruby incorrectly handled certain files. An attacker
could possibly use this issue to pass path matching what can lead to an
unauthorized access. (CVE-2019-15845)
It was discovered that Ruby incorrectly handled certain regular expressions. An
attacker could use this issue to cause a denial of service. (CVE-2019-16201)
It was discovered that Ruby incorrectly handled certain HTTP headers. An
attacker could possibly use this issue to execute arbitrary code.
(CVE-2019-16254)
It was discovered that Ruby incorrectly handled certain inputs. An attacker
could possibly use this issue to execute arbitrary code. (CVE-2019-16255)
Update instructions
The problem can be corrected by updating your system to the following package
versions:
Ubuntu 19.10
libruby2.5 - 2.5.5-4ubuntu2.1
ruby2.5 - 2.5.5-4ubuntu2.1
Ubuntu 19.04
libruby2.5 - 2.5.5-1ubuntu1.1
ruby2.5 - 2.5.5-1ubuntu1.1
Ubuntu 18.04 LTS
libruby2.5 - 2.5.1-1ubuntu1.6
ruby2.5 - 2.5.1-1ubuntu1.6
Ubuntu 16.04 LTS
libruby2.3 - 2.3.1-2~ubuntu16.04.14
ruby2.3 - 2.3.1-2~ubuntu16.04.14
To update your system, please follow these instructions: https://
wiki.ubuntu.com/Security/Upgrades .
In general, a standard system update will make all the necessary changes.
References
o CVE-2019-15845
o CVE-2019-16201
o CVE-2019-16254
o CVE-2019-16255
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