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AUSCERT External Security Bulletin Redistribution
ESB-2021.2484
USN-5020-1: Ruby vulnerabilities
22 July 2021
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AusCERT Security Bulletin Summary
---------------------------------
Product: Ruby
Publisher: Ubuntu
Operating System: Ubuntu
Impact/Access: Execute Arbitrary Code/Commands -- Existing Account
Unauthorised Access -- Remote/Unauthenticated
Reduced Security -- Remote/Unauthenticated
Provide Misleading Information -- Unknown/Unspecified
Access Confidential Data -- Unknown/Unspecified
Resolution: Patch/Upgrade
CVE Names: CVE-2021-32066 CVE-2021-31810 CVE-2021-31799
Reference: ESB-2021.2338
ESB-2021.2337
ESB-2021.1496
Original Bulletin:
https://ubuntu.com/security/notices/USN-5020-1
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USN-5020-1: Ruby vulnerabilities
21 July 2021
Several security issues were fixed in Ruby.
Releases
o Ubuntu 21.04
o Ubuntu 20.10
o Ubuntu 20.04 LTS
o Ubuntu 18.04 LTS
o Ubuntu 16.04 ESM
Packages
o ruby2.3 - Object-oriented scripting language
o ruby2.5 - Object-oriented scripting language
o ruby2.7 - Object-oriented scripting language
Details
It was discovered that Ruby incorrectly handled certain inputs.
An attacker could possibly use this issue to execute arbitrary code.
( CVE-2021-31799 )
It was discovered that Ruby incorrectly handled certain inputs.
An attacker could possibly use this issue to conduct
port scans and service banner extractions. This issue only affected
Ubuntu 18.04 LTS, Ubuntu 20.04 LTS, Ubuntu 20.10, and Ubuntu 21.04. (
CVE-2021-31810 )
It was discovered that Ruby incorrectly handled certain inputs.
An attacker could possibly use this issue to perform
man-in-the-middle attackers to bypass the TLS protection.
( CVE-2021-32066 )
Update instructions
The problem can be corrected by updating your system to the following package
versions:
Ubuntu 21.04
o ruby2.7 - 2.7.2-4ubuntu1.2
o libruby2.7 - 2.7.2-4ubuntu1.2
Ubuntu 20.10
o ruby2.7 - 2.7.1-3ubuntu1.4
o libruby2.7 - 2.7.1-3ubuntu1.4
Ubuntu 20.04
o ruby2.7 - 2.7.0-5ubuntu1.5
o libruby2.7 - 2.7.0-5ubuntu1.5
Ubuntu 18.04
o ruby2.5 - 2.5.1-1ubuntu1.10
o libruby2.5 - 2.5.1-1ubuntu1.10
Ubuntu 16.04
o libruby2.3 - 2.3.1-2~ubuntu16.04.16+esm1
Available with UA Infra or UA Desktop
o ruby2.3 - 2.3.1-2~ubuntu16.04.16+esm1
Available with UA Infra or UA Desktop
In general, a standard system update will make all the necessary changes.
References
o CVE-2021-31799
o CVE-2021-32066
o CVE-2021-31810
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