[Security] Bump nokogiri from 1.6.0 to 1.6.8.1

[dependabot-preview]

Bumps nokogiri from 1.6.0 to 1.6.8.1. This update includes security fixes.

Vulnerabilities fixed

Sourced from The Ruby Advisory Database.

Nokogiri Gem for JRuby XML Document Root Element Handling Memory Consumption Remote DoS
Nokogiri Gem for JRuby contains a flaw that is triggered when handling a root
element in an XML document. This may allow a remote attacker to cause a
consumption of memory resources.

Patched versions: >= 1.6.3
Unaffected versions: none

Sourced from The Ruby Advisory Database.

Denial of service or RCE from libxml2 and libxslt
Nokogiri is affected by series of vulnerabilities in libxml2 and libxslt,
which are libraries Nokogiri depends on. It was discovered that libxml2 and
libxslt incorrectly handled certain malformed documents, which can allow
malicious users to cause issues ranging from denial of service to remote code
execution attacks.

For more information, the Ubuntu Security Notice is a good start:
http://www.ubuntu.com/usn/usn-2994-1/

Patched versions: >= 1.6.8
Unaffected versions: < 1.6.0

Sourced from The Ruby Advisory Database.

Nokogiri gem contains a heap-based buffer overflow vulnerability in libxml2
Nokogiri version 1.6.7.2 has been released, pulling in several upstream
patches to the vendored libxml2 to address the following CVE:

CVE-2015-7499
CVSS v2 Base Score: 5.0 (MEDIUM)

Heap-based buffer overflow in the xmlGROW function in parser.c
in libxml2 before 2.9.3 allows context-dependent attackers to
obtain sensitive process memory information via unspecified
vectors.

libxml2 could be made to crash if it opened a specially crafted
file. It was discovered that libxml2 incorrectly handled certain
malformed documents. If a user or automated system were tricked
into opening a specially crafted document, an attacker could
possibly cause libxml2 to crash, resulting in a denial of service.

Patched versions: >= 1.6.7.2
Unaffected versions: < 1.6.0

Sourced from The Ruby Advisory Database.

Nokogiri gem contains several vulnerabilities in libxml2
Nokogiri version 1.6.7.1 has been released, pulling in several upstream
patches to the vendored libxml2 to address the following CVEs:

CVE-2015-5312
CVSS v2 Base Score: 7.1 (HIGH)
The xmlStringLenDecodeEntities function in parser.c in libxml2
before 2.9.3 does not properly prevent entity expansion, which
allows context-dependent attackers to cause a denial of
service (CPU consumption) via crafted XML data, a different
vulnerability than CVE-2014-3660.

CVE-2015-7497
CVSS v2 Base Score: 5.0 (MEDIUM)
Heap-based buffer overflow in the xmlDictComputeFastQKey
function in dict.c in libxml2 before 2.9.3 allows
context-dependent attackers to cause a denial of service via
unspecified vectors.

CVE-2015-7498
CVSS v2 Base Score: 5.0 (MEDIUM)

... (truncated)

Patched versions: >= 1.6.7.1
Unaffected versions: < 1.6.0

Sourced from The Ruby Advisory Database.

Nokogiri gem contains several vulnerabilities in libxml2 and libxslt
Several vulnerabilities were discovered in the libxml2 and libxslt libraries
that the Nokogiri gem depends on.

CVE-2015-1819
A denial of service flaw was found in the way libxml2 parsed XML
documents. This flaw could cause an application that uses libxml2 to use an
excessive amount of memory.

CVE-2015-7941
libxml2 does not properly stop parsing invalid input, which allows
context-dependent attackers to cause a denial of service (out-of-bounds read
and libxml2 crash) via crafted specially XML data.

CVE-2015-7942
The xmlParseConditionalSections function in parser.c in libxml2
does not properly skip intermediary entities when it stops parsing invalid
input, which allows context-dependent attackers to cause a denial of service
(out-of-bounds read and crash) via crafted XML data.

CVE-2015-7995

... (truncated)

Patched versions: ~> 1.6.6.4; >= 1.6.7.rc4
Unaffected versions: none

Changelog

Sourced from nokogiri's changelog.

1.6.8.1 / 2016-10-03

Dependency License Notes

Removes required dependency on the pkg-config gem. This dependency
was introduced in v1.6.8 and, because it's distributed under LGPL, was
objectionable to many Nokogiri users (#1488, #1496).

This version makes pkg-config an optional dependency. If it's
installed, it's used; but otherwise Nokogiri will attempt to work
around its absence.

1.6.8 / 2016-06-06

Security Notes

[MRI] Bundled libxml2 is upgraded to 2.9.4, which fixes many security issues. Many of these had previously been patched in the vendored libxml 2.9.2 in the 1.6.7.x branch, but some are newer.

See these libxml2 email posts for more:

• https://mail.gnome.org/archives/xml/2015-November/msg00012.html
• https://mail.gnome.org/archives/xml/2016-May/msg00023.html

For a more detailed analysis, you may care to read Canonical's take on these security issues:

• http://www.ubuntu.com/usn/usn-2994-1

[MRI] Bundled libxslt is upgraded to 1.1.29, which fixes a security issue as well as many long-known outstanding bugs, some features, some portability improvements, and general cleanup.

See this libxslt email post for more:

• https://mail.gnome.org/archives/xslt/2016-May/msg00004.html

Features

Several changes were made to improve performance:

• [MRI] Simplify NodeSet#to_a with a minor speed-up. (#1397)
• XML::Node#ancestors optimization. (#1297) (Thanks, Bruno Sutic!)
• Use Symbol#to_proc where we weren't previously. (#1296) (Thanks, Bruno Sutic!)
• XML::DTD#each uses implicit block calls. (Thanks, @​glaucocustodio!)
• Fall back to the pkg-config gem if we're having trouble finding the system libxml2. This should help many FreeBSD users. (#1417)
• Set document encoding appropriately even on blank document. (#1043) (Thanks, @​batter!)

Bug Fixes

... (truncated)

Commits

• 002e4d8 version bump to v1.6.8.1
• 3b9ee4b update CHANGELOG for pkg-config
• f2dd079 Make the pkg-config gem optional.
• 6b05c5a update v1.6.8 date in CHANGELOG
• 1103a64 version bump to v1.6.8 final
• 03d4022 update CHANGELOG with libxml2 USN info
• a7da0f9 make sure test_all will errexit
• 8d4ea86 make sure test_all doesn't require libxml-ruby
• 80e800b use eval_gemfile to load libxml-ruby
• 95ba49a test_all uses Bundler 1.12.*
• Additional commits viewable in compare view

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