Issued:

2018-02-28

Updated:

2018-02-28

RHSA-2018:0378 - Important: ruby security update

Synopsis

Important: ruby security update

Type/Severity

Security Advisory Important

Topic

An update for ruby is now available for Red Hat Enterprise Linux 7.

Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.

Description

Ruby is an extensible, interpreted, object-oriented, scripting language. It has features to process text files and to perform system management tasks.

Security Fix(es):

• It was discovered that the Net::FTP module did not properly process filenames in combination with certain operations. A remote attacker could exploit this flaw to execute arbitrary commands by setting up a malicious FTP server and tricking a user or Ruby application into downloading files with specially crafted names using the Net::FTP module. (CVE-2017-17405)

• A buffer underflow was found in ruby's sprintf function. An attacker, with ability to control its format string parameter, could send a specially crafted string that would disclose heap memory or crash the interpreter. (CVE-2017-0898)

• It was found that rubygems did not sanitize gem names during installation of a given gem. A specially crafted gem could use this flaw to install files outside of the regular directory. (CVE-2017-0901)

• A vulnerability was found where rubygems did not sanitize DNS responses when requesting the hostname of the rubygems server for a domain, via a _rubygems._tcp DNS SRV query. An attacker with the ability to manipulate DNS responses could direct the gem command towards a different domain. (CVE-2017-0902)

• A vulnerability was found where the rubygems module was vulnerable to an unsafe YAML deserialization when inspecting a gem. Applications inspecting gem files without installing them can be tricked to execute arbitrary code in the context of the ruby interpreter. (CVE-2017-0903)

• It was found that WEBrick did not sanitize all its log messages. If logs were printed in a terminal, an attacker could interact with the terminal via the use of escape sequences. (CVE-2017-10784)

• It was found that the decode method of the OpenSSL::ASN1 module was vulnerable to buffer underrun. An attacker could pass a specially crafted string to the application in order to crash the ruby interpreter, causing a denial of service. (CVE-2017-14033)

• A vulnerability was found where rubygems did not properly sanitize gems' specification text. A specially crafted gem could interact with the terminal via the use of escape sequences. (CVE-2017-0899)

• It was found that rubygems could use an excessive amount of CPU while parsing a sufficiently long gem summary. A specially crafted gem from a gem repository could freeze gem commands attempting to parse its summary. (CVE-2017-0900)

• A buffer overflow vulnerability was found in the JSON extension of ruby. An attacker with the ability to pass a specially crafted JSON input to the extension could use this flaw to expose the interpreter's heap memory. (CVE-2017-14064)

• The "lazy_initialize" function in lib/resolv.rb did not properly process certain filenames. A remote attacker could possibly exploit this flaw to inject and execute arbitrary commands. (CVE-2017-17790)

Solution

For details on how to apply this update, which includes the changes described in this advisory, refer to:

https://access.redhat.com/articles/11258

Affected Products

Updated Packages

• rubygem-io-console-0.4.2-33.el7_4.s390x.rpm
• rubygem-psych-2.0.0-33.el7_4.ppc64.rpm
• ruby-libs-2.0.0.648-33.el7_4.ppc64le.rpm
• rubygem-bigdecimal-1.2.0-33.el7_4.ppc64le.rpm
• ruby-tcltk-2.0.0.648-33.el7_4.x86_64.rpm
• ruby-debuginfo-2.0.0.648-33.el7_4.s390x.rpm
• ruby-libs-2.0.0.648-33.el7_4.i686.rpm
• ruby-2.0.0.648-33.el7_4.x86_64.rpm
• ruby-2.0.0.648-33.el7_4.src.rpm
• rubygem-io-console-0.4.2-33.el7_4.x86_64.rpm
• ruby-2.0.0.648-33.el7_4.s390x.rpm
• rubygem-json-1.7.7-33.el7_4.ppc64.rpm
• rubygem-io-console-0.4.2-33.el7_4.ppc64le.rpm
• ruby-debuginfo-2.0.0.648-33.el7_4.x86_64.rpm
• ruby-libs-2.0.0.648-33.el7_4.ppc64.rpm
• ruby-tcltk-2.0.0.648-33.el7_4.ppc64le.rpm
• rubygem-io-console-0.4.2-33.el7_4.aarch64.rpm
• rubygem-json-1.7.7-33.el7_4.x86_64.rpm
• rubygem-bigdecimal-1.2.0-33.el7_4.s390x.rpm
• ruby-debuginfo-2.0.0.648-33.el7_4.ppc64.rpm
• ruby-debuginfo-2.0.0.648-33.el7_4.s390.rpm
• ruby-devel-2.0.0.648-33.el7_4.aarch64.rpm
• ruby-libs-2.0.0.648-33.el7_4.s390x.rpm
• ruby-irb-2.0.0.648-33.el7_4.noarch.rpm
• ruby-tcltk-2.0.0.648-33.el7_4.aarch64.rpm
• ruby-debuginfo-2.0.0.648-33.el7_4.aarch64.rpm
• ruby-libs-2.0.0.648-33.el7_4.aarch64.rpm
• ruby-devel-2.0.0.648-33.el7_4.s390x.rpm
• ruby-devel-2.0.0.648-33.el7_4.ppc64le.rpm
• rubygem-rake-0.9.6-33.el7_4.noarch.rpm
• rubygem-bigdecimal-1.2.0-33.el7_4.x86_64.rpm
• rubygem-minitest-4.3.2-33.el7_4.noarch.rpm
• rubygem-psych-2.0.0-33.el7_4.s390x.rpm
• ruby-libs-2.0.0.648-33.el7_4.ppc.rpm
• ruby-doc-2.0.0.648-33.el7_4.noarch.rpm
• rubygem-bigdecimal-1.2.0-33.el7_4.ppc64.rpm
• rubygem-json-1.7.7-33.el7_4.ppc64le.rpm
• rubygems-2.0.14.1-33.el7_4.noarch.rpm
• rubygem-psych-2.0.0-33.el7_4.x86_64.rpm
• ruby-debuginfo-2.0.0.648-33.el7_4.ppc64le.rpm
• ruby-tcltk-2.0.0.648-33.el7_4.ppc64.rpm
• rubygem-json-1.7.7-33.el7_4.s390x.rpm
• rubygem-rdoc-4.0.0-33.el7_4.noarch.rpm
• rubygem-bigdecimal-1.2.0-33.el7_4.aarch64.rpm
• ruby-libs-2.0.0.648-33.el7_4.x86_64.rpm
• ruby-debuginfo-2.0.0.648-33.el7_4.ppc.rpm
• rubygem-psych-2.0.0-33.el7_4.aarch64.rpm
• ruby-devel-2.0.0.648-33.el7_4.x86_64.rpm
• ruby-2.0.0.648-33.el7_4.ppc64.rpm
• ruby-debuginfo-2.0.0.648-33.el7_4.i686.rpm
• ruby-2.0.0.648-33.el7_4.aarch64.rpm
• rubygem-json-1.7.7-33.el7_4.aarch64.rpm
• rubygems-devel-2.0.14.1-33.el7_4.noarch.rpm
• rubygem-psych-2.0.0-33.el7_4.ppc64le.rpm
• ruby-devel-2.0.0.648-33.el7_4.ppc64.rpm
• ruby-tcltk-2.0.0.648-33.el7_4.s390x.rpm
• rubygem-io-console-0.4.2-33.el7_4.ppc64.rpm
• ruby-2.0.0.648-33.el7_4.ppc64le.rpm
• ruby-libs-2.0.0.648-33.el7_4.s390.rpm

Fixes

• This content is not included.BZ - 1487552
• This content is not included.BZ - 1487587
• This content is not included.BZ - 1487588
• This content is not included.BZ - 1487589
• This content is not included.BZ - 1487590
• This content is not included.BZ - 1491866
• This content is not included.BZ - 1492012
• This content is not included.BZ - 1492015
• This content is not included.BZ - 1500488
• This content is not included.BZ - 1526189
• This content is not included.BZ - 1528218

CVEs

• 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-2017-17790

References

• https://access.redhat.com/security/updates/classification/#important

Additional information

• The Red Hat security contact is This content is not included.secalert@redhat.com. More contact details at https://access.redhat.com/security/team/contact/.
• Offline Security Data data is available for integration with other systems. See Offline Security Data API to get started.