Debian Security Advisory

DLA-1421-1 ruby2.1 -- LTS security update

Date Reported:
14 Jul 2018
Affected Packages:
Security database references:
In the Debian bugtracking system: Bug 851161.
In Mitre's CVE dictionary: CVE-2015-9096, CVE-2016-2339, CVE-2016-7798, CVE-2017-0898, CVE-2017-0899, CVE-2017-0900, CVE-2017-0901, CVE-2017-0902, CVE-2017-0903, CVE-2017-10784, CVE-2017-14033, CVE-2017-14064, CVE-2017-17405, CVE-2017-17742, CVE-2017-17790, CVE-2018-6914, CVE-2018-8777, CVE-2018-8778, CVE-2018-8779, CVE-2018-8780, CVE-2018-1000075, CVE-2018-1000076, CVE-2018-1000077, CVE-2018-1000078, CVE-2018-1000079.
More information:

Multiple vulnerabilities were found in the interpreter for the Ruby language. The Common Vulnerabilities and Exposures project identifies the following issues:

  • CVE-2015-9096

    SMTP command injection in Net::SMTP via CRLF sequences in a RCPT TO or MAIL FROM command.

  • CVE-2016-2339

    Exploitable heap overflow in

  • CVE-2016-7798

    Incorrect handling of initialization vector in the GCM mode in the OpenSSL extension.

  • CVE-2017-0898

    Buffer underrun vulnerability in Kernel.sprintf.

  • CVE-2017-0899

    ANSI escape sequence vulnerability in RubyGems.

  • CVE-2017-0900

    DoS vulnerability in the RubyGems query command.

  • CVE-2017-0901

    gem installer allowed a malicious gem to overwrite arbitrary files.

  • CVE-2017-0902

    RubyGems DNS request hijacking vulnerability.

  • CVE-2017-0903

    Max Justicz reported that RubyGems is prone to an unsafe object deserialization vulnerability. When parsed by an application which processes gems, a specially crafted YAML formatted gem specification can lead to remote code execution.

  • CVE-2017-10784

    Yusuke Endoh discovered an escape sequence injection vulnerability in the Basic authentication of WEBrick. An attacker can take advantage of this flaw to inject malicious escape sequences to the WEBrick log and potentially execute control characters on the victim's terminal emulator when reading logs.

  • CVE-2017-14033

    asac reported a buffer underrun vulnerability in the OpenSSL extension. A remote attacker could take advantage of this flaw to cause the Ruby interpreter to crash leading to a denial of service.

  • CVE-2017-14064

    Heap memory disclosure in the JSON library.

  • CVE-2017-17405

    A command injection vulnerability in Net::FTP might allow a malicious FTP server to execute arbitrary commands.

  • CVE-2017-17742

    Aaron Patterson reported that WEBrick bundled with Ruby was vulnerable to an HTTP response splitting vulnerability. It was possible for an attacker to inject fake HTTP responses if a script accepted an external input and output it without modifications.

  • CVE-2017-17790

    A command injection vulnerability in lib/resolv.rb's lazy_initialze might allow a command injection attack. However untrusted input to this function is rather unlikely.

  • CVE-2018-6914

    ooooooo_q discovered a directory traversal vulnerability in the Dir.mktmpdir method in the tmpdir library. It made it possible for attackers to create arbitrary directories or files via a .. (dot dot) in the prefix argument.

  • CVE-2018-8777

    Eric Wong reported an out-of-memory DoS vulnerability related to a large request in WEBrick bundled with Ruby.

  • CVE-2018-8778

    aerodudrizzt found a buffer under-read vulnerability in the Ruby String#unpack method. If a big number was passed with the specifier @, the number was treated as a negative value, and an out-of-buffer read occurred. Attackers could read data on heaps if an script accepts an external input as the argument of String#unpack.

  • CVE-2018-8779

    ooooooo_q reported that the and methods of the socket library bundled with Ruby did not check for NUL bytes in the path argument. The lack of check made the methods vulnerable to unintentional socket creation and unintentional socket access.

  • CVE-2018-8780

    ooooooo_q discovered an unintentional directory traversal in some methods in Dir, by the lack of checking for NUL bytes in their parameter.

  • CVE-2018-1000075

    A negative size vulnerability in ruby gem package tar header that could cause an infinite loop.

  • CVE-2018-1000076

    RubyGems package improperly verifies cryptographic signatures. A mis-signed gem could be installed if the tarball contains multiple gem signatures.

  • CVE-2018-1000077

    An improper input validation vulnerability in RubyGems specification homepage attribute could allow malicious gem to set an invalid homepage URL.

  • CVE-2018-1000078

    Cross Site Scripting (XSS) vulnerability in gem server display of homepage attribute.

  • CVE-2018-1000079

    Path Traversal vulnerability during gem installation.

For Debian 8 Jessie, these problems have been fixed in version 2.1.5-2+deb8u4.

We recommend that you upgrade your ruby2.1 packages.

Further information about Debian LTS security advisories, how to apply these updates to your system and frequently asked questions can be found at: