ELA-495-1 ruby2.1 security update

multiple vulnerabilites

Related CVEs CVE-2021-31799 CVE-2021-31810 CVE-2021-32066

Multiple vulnerabilites in ruby2.1, interpreter of object-oriented scripting language Ruby, were discovered.


In RDoc 3.11 through 6.x before 6.3.1, as distributed with
Ruby through 2.1.5, it is possible to execute arbitrary
code via | and tags in a filename.


An issue was discovered in Ruby through 2.1.5. A malicious
FTP server can use the PASV response to trick Net::FTP into
connecting back to a given IP address and port. This
potentially makes curl extract information about services
that are otherwise private and not disclosed (e.g., the
attacker can conduct port scans and service banner extractions).


An issue was discovered in Ruby through 2.1.5. Net::IMAP does
not raise an exception when StartTLS fails with an an unknown
response, which might allow man-in-the-middle attackers to
bypass the TLS protections by leveraging a network position
between the client and the registry to block the StartTLS
command, aka a "StartTLS stripping attack."

For Debian 8 jessie, these problems have been fixed in version 2.1.5-2+deb8u12.

We recommend that you upgrade your ruby2.1 packages.

Further information about Extended LTS security advisories can be found in the dedicated section of our website.