Detections
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Amazon Linux AMI : ruby20 / ruby21, ruby24 (ALAS-2019-1255)
high Nessus Plugin ID 127811
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Synopsis
The remote Amazon Linux AMI host is missing a security update.Description
An issue was discovered in RubyGems. The gem owner command outputs the contents of the API response directly to stdout. Therefore, if the response is crafted, escape sequence injection may occur.(CVE-2019-8322)An issue was discovered in RubyGems.
Gem::GemcutterUtilities#with_response may output the API response to stdout as it is. Therefore, if the API side modifies the response, escape sequence injection may occur.(CVE-2019-8323)
An issue was discovered in RubyGems. Since Gem::UserInteraction#verbose calls say without escaping, escape sequence injection is possible.(CVE-2019-8321)
A Directory Traversal issue was discovered in RubyGems. Before making new directories or touching files (which now include path-checking code for symlinks), it would delete the target destination. If that destination was hidden behind a symlink, a malicious gem could delete arbitrary files on the user's machine, presuming the attacker could guess at paths. Given how frequently gem is run as sudo, and how predictable paths are on modern systems (/tmp, /usr, etc.), this could likely lead to data loss or an unusable system.(CVE-2019-8320)
An issue was discovered in RubyGems. A crafted gem with a multi-line name is not handled correctly. Therefore, an attacker could inject arbitrary code to the stub line of gemspec, which is eval-ed by code in ensure_loadable_spec during the preinstall check.(CVE-2019-8324)
An issue was discovered in RubyGems. Since Gem::CommandManager#run calls alert_error without escaping, escape sequence injection is possible. (There are many ways to cause an error.)(CVE-2019-8325)
Solution
Run 'yum update ruby20' to update your system.Run 'yum update ruby21' to update your system.
Run 'yum update ruby24' to update your system.
See Also
Plugin Details
Severity: High
ID: 127811
File Name: ala_ALAS-2019-1255.nasl
Version: 1.3
Type: local
Agent: unix
Published: 8/13/2019
Updated: 5/23/2022
Supported Sensors: Frictionless Assessment AWS, Frictionless Assessment Agent, Nessus Agent, Agentless Assessment, Nessus
Risk Information
VPR
Risk Factor: Medium
Score: 6.0
CVSS v2
Risk Factor: High
Base Score: 8.8
Temporal Score: 6.5
Vector: CVSS2#AV:N/AC:M/Au:N/C:N/I:C/A:C
CVSS Score Source: CVE-2019-8320
CVSS v3
Risk Factor: High
Base Score: 8.8
Temporal Score: 7.7
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C
Vulnerability Information
CPE: p-cpe:/a:amazon:linux:ruby20, p-cpe:/a:amazon:linux:ruby20-debuginfo, p-cpe:/a:amazon:linux:ruby20-devel, p-cpe:/a:amazon:linux:ruby20-doc, p-cpe:/a:amazon:linux:ruby20-irb, p-cpe:/a:amazon:linux:ruby20-libs, p-cpe:/a:amazon:linux:ruby21, p-cpe:/a:amazon:linux:ruby21-debuginfo, p-cpe:/a:amazon:linux:ruby21-devel, p-cpe:/a:amazon:linux:ruby21-doc, p-cpe:/a:amazon:linux:ruby21-irb, p-cpe:/a:amazon:linux:ruby21-libs, p-cpe:/a:amazon:linux:ruby24, p-cpe:/a:amazon:linux:ruby24-debuginfo, p-cpe:/a:amazon:linux:ruby24-devel, p-cpe:/a:amazon:linux:ruby24-doc, p-cpe:/a:amazon:linux:ruby24-irb, p-cpe:/a:amazon:linux:ruby24-libs, p-cpe:/a:amazon:linux:rubygem20-bigdecimal, p-cpe:/a:amazon:linux:rubygem20-io-console, p-cpe:/a:amazon:linux:rubygem20-psych, p-cpe:/a:amazon:linux:rubygem21-bigdecimal, p-cpe:/a:amazon:linux:rubygem21-io-console, p-cpe:/a:amazon:linux:rubygem21-psych, p-cpe:/a:amazon:linux:rubygem24-bigdecimal, p-cpe:/a:amazon:linux:rubygem24-did_you_mean, p-cpe:/a:amazon:linux:rubygem24-io-console, p-cpe:/a:amazon:linux:rubygem24-json, p-cpe:/a:amazon:linux:rubygem24-psych, p-cpe:/a:amazon:linux:rubygem24-xmlrpc, p-cpe:/a:amazon:linux:rubygems20, p-cpe:/a:amazon:linux:rubygems20-devel, p-cpe:/a:amazon:linux:rubygems21, p-cpe:/a:amazon:linux:rubygems21-devel, p-cpe:/a:amazon:linux:rubygems24, p-cpe:/a:amazon:linux:rubygems24-devel, cpe:/o:amazon:linux
Required KB Items: Host/local_checks_enabled, Host/AmazonLinux/release, Host/AmazonLinux/rpm-list
Exploit Ease: No known exploits are available
Patch Publication Date: 8/7/2019
Vulnerability Publication Date: 6/6/2019
Reference Information
CVE: CVE-2019-8320, CVE-2019-8321, CVE-2019-8322, CVE-2019-8323, CVE-2019-8324, CVE-2019-8325
ALAS: 2019-1255