ESB-2018.2538 - [Debian] ruby2.1: Multiple vulnerabilities 2018-08-28

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2018.2538
                   [DLA 1480-1] ruby2.1 security update
                              28 August 2018

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        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           ruby2.1
Publisher:         Debian
Operating System:  Debian GNU/Linux 8
Impact/Access:     Execute Arbitrary Code/Commands -- Remote/Unauthenticated      
                   Modify Arbitrary Files          -- Remote with User Interaction
                   Create Arbitrary Files          -- Remote with User Interaction
Resolution:        Patch/Upgrade
CVE Names:         CVE-2018-1000074 CVE-2018-1000073 CVE-2016-2337

Reference:         ESB-2018.2220
                   ESB-2017.1828

Original Bulletin: 
   https://lists.debian.org/debian-lts-announce/2018/08/msg00028.html

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Package        : ruby2.1
Version        : 2.1.5-2+deb8u5
CVE ID         : CVE-2016-2337 CVE-2018-1000073 CVE-2018-1000074
Debian Bug     : 895778 851161

Several vulnerabilities were discovered in Ruby 2.1.

CVE-2016-2337

    Type confusion exists in _cancel_eval Ruby's TclTkIp class
    method. Attacker passing different type of object than String as
    "retval" argument can cause arbitrary code execution.

CVE-2018-1000073

    RubyGems contains a Directory Traversal vulnerability in
    install_location function of package.rb that can result in path
    traversal when writing to a symlinked basedir outside of the root.

CVE-2018-1000074

    RubyGems contains a Deserialization of Untrusted Data
    vulnerability in owner command that can result in code
    execution. This attack appear to be exploitable via victim must
    run the `gem owner` command on a gem with a specially crafted YAML
    file.

For Debian 8 "Jessie", these problems have been fixed in version
2.1.5-2+deb8u5.

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: https://wiki.debian.org/LTS

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