Ubuntu 16.04 LTS / 17.10 : ruby2.3 vulnerabilities (USN-3553-1)
High Nessus Plugin ID 106557
SynopsisThe remote Ubuntu host is missing one or more security-related patches.
DescriptionIt was discovered that Ruby failed to validate specification names. An attacker could possibly use a maliciously crafted gem to potentially overwrite any file on the filesystem. (CVE-2017-0901)
It was discovered that Ruby was vulnerable to a DNS hijacking vulnerability. An attacker could use this to possibly force the RubyGems client to download and install gems from a server that the attacker controls. (CVE-2017-0902)
It was discovered that Ruby incorrectly handled certain YAML files. An attacker could use this to possibly execute arbitrary code.
Note that Tenable Network Security has extracted the preceding description block directly from the Ubuntu security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.
SolutionUpdate the affected libruby2.3 and / or ruby2.3 packages.