CVE-2015-1819: Nokogiri Nokogiri Vulnerable To Libxml XML Vulnerability

Q: What is CVE-2015-1819?

CVE-2015-1819 is a security vulnerability in Nokogiri involving Nokogiri vulnerable to libxml XML Entity Expansion under CWE-776: Improper Restriction of Recursive Entity References in DTDs ('XML Entity Expansion').

Q: Which Nokogiri versions are affected?

Affected versions include releases prior to 1.6.6.4 across affected packages: nokogiri.

Q: What version fixes CVE-2015-1819?

Upgrading to 1.6.6.4 (or the latest patched release for your respective branch) resolves the vulnerability.

Q: Is nokogiri affected?

Yes, nokogiri is affected in releases prior to 1.6.6.4. Upgrade your dependency to 1.6.6.4 or later.

Q: What CWE is associated with CVE-2015-1819?

CVE-2015-1819 is classified under CWE-776: Improper Restriction of Recursive Entity References in DTDs ('XML Entity Expansion') (The product uses XML documents and allows their structure to be defined with a Document Type Definition (DTD), but it does not properly control the number of recursive definitions of entities.).

Q: How can I check RubyGems dependencies for CVE-2015-1819?

Run the dependency tree command: 'inspect dependencies for nokogiri'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.

MODERATE

Advisory Identifier: GHSA-q7wx-62r7-j2x7

CWE-776

Published 2018-08-08

Advisory Summary

CVE-2015-1819 is a MODERATE nokogiri vulnerable to libxml xml vulnerability (CWE-776: Improper Restriction of Recursive Entity References in DTDs ('XML Entity Expansion')) affecting Nokogiri libraries in the RubyGems ecosystem. The issue involves nokogiri vulnerable to libxml xml entity expansion. Remediation is available by upgrading affected packages to version 1.6.6.4.

CVE-2015-1819 at a Glance

CVE Identifier CVE-2015-1819

GHSA Identifier GHSA-q7wx-62r7-j2x7

Severity MODERATE

CVSS v3.1 Base Score N/A

CWE Classification CWE-776: Improper Restriction of Recursive Entity References in DTDs ('XML Entity Expansion')

Affected Product Nokogiri

Package Ecosystem RubyGems

Published Date 2018-08-08

Last Updated 2023-03-14

How to Fix CVE-2015-1819

To remediate this vulnerability, upgrade all affected Nokogiri dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

nokogiri fixed: 1.6.6.4

Upgrade nokogiri to 1.6.6.4

Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release:

inspect dependencies for nokogiri

How to Check if You Are Affected

To determine whether your application is affected by CVE-2015-1819, inspect your project dependencies for Nokogiri:

inspect dependencies for nokogiri

Analyze the terminal output to locate any version of Nokogiri in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 1.6.6.4), your application is affected.

Note: Verify declared build manifests and deployed runtime container environments.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-776: Improper Restriction of Recursive Entity References in DTDs ('XML Entity Expansion'), where the product uses xml documents and allows their structure to be defined with a document type definition (dtd), but it does not properly control the number of recursive definitions of entities. In Nokogiri, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

The xmlreader in libxml allows remote attackers to cause a denial of service (memory consumption) via crafted XML data, related to an XML Entity Expansion (XEE) attack.

CVE-2015-1819 Affected Nokogiri Versions

1 component(s)

Fixed Versions:

1.6.6.4

Product / Package	Ecosystem	Affected Versions	Fixed Version
nokogiri gem/nokogiri	RubyGems	≥ 1.6.6.0 < 1.6.6.4	1.6.6.4

References

NVD — CVE-2015-1819 NVD

https://nvd.nist.gov/vuln/detail/CVE-2015-1819

Nokogiri Source Repository REPOSITORY

https://github.com/sparklemotion/nokogiri/issues/1374

git.gnome.org/browse/libxml2/comm... WEB

https://git.gnome.org/browse/libxml2/commit/?id=213f1fe0d76d30eaed6e5853057defc43e6df2c9

Nokogiri Source Repository REPOSITORY

https://github.com/rubysec/ruby-advisory-db/blob/master/gems/nokogiri/CVE-2015-1819.yml

Nokogiri Security Information SECURITY

https://security.gentoo.org/glsa/201507-08

Nokogiri Security Information SECURITY

https://security.gentoo.org/glsa/201701-37

support.apple.com/ht206166 WEB

https://support.apple.com/HT206166

support.apple.com/ht206167 WEB

https://support.apple.com/HT206167

support.apple.com/ht206168 WEB

https://support.apple.com/HT206168

support.apple.com/ht206169 WEB

https://support.apple.com/HT206169

Nokogiri Security Information SECURITY

http://lists.apple.com/archives/security-announce/2016/Mar/msg00000.html

Nokogiri Security Information SECURITY

http://lists.apple.com/archives/security-announce/2016/Mar/msg00001.html

Nokogiri Security Information SECURITY

http://lists.apple.com/archives/security-announce/2016/Mar/msg00002.html

Nokogiri Security Information SECURITY

http://lists.apple.com/archives/security-announce/2016/Mar/msg00004.html

lists.fedoraproject.org/pipermail/package-a... WEB

http://lists.fedoraproject.org/pipermail/package-announce/2015-November/172710.html

lists.fedoraproject.org/pipermail/package-a... WEB

http://lists.fedoraproject.org/pipermail/package-announce/2015-November/172943.html

lists.opensuse.org/opensuse-updates/20... WEB

http://lists.opensuse.org/opensuse-updates/2015-12/msg00120.html

lists.opensuse.org/opensuse-updates/20... WEB

http://lists.opensuse.org/opensuse-updates/2016-01/msg00031.html

rhn.redhat.com/errata/rhsa-2015-14... WEB

http://rhn.redhat.com/errata/RHSA-2015-1419.html

rhn.redhat.com/errata/rhsa-2015-25... WEB

http://rhn.redhat.com/errata/RHSA-2015-2550.html

Nokogiri Security Information SECURITY

http://www.debian.org/security/2015/dsa-3430

Nokogiri Security Information SECURITY

http://www.oracle.com/technetwork/topics/security/bulletinoct2015-2511968.html

Nokogiri Security Information SECURITY

http://www.oracle.com/technetwork/topics/security/linuxbulletinoct2015-2719645.html

www.ubuntu.com/usn/usn-2812-1 WEB

http://www.ubuntu.com/usn/USN-2812-1

xmlsoft.org/news.html WEB

http://xmlsoft.org/news.html

Frequently Asked Questions

What is CVE-2015-1819?

CVE-2015-1819 is a security vulnerability in Nokogiri involving Nokogiri vulnerable to libxml XML Entity Expansion under CWE-776: Improper Restriction of Recursive Entity References in DTDs ('XML Entity Expansion').

Which Nokogiri versions are affected?

Affected versions include releases prior to 1.6.6.4 across affected packages: nokogiri.

What version fixes CVE-2015-1819?

Upgrading to 1.6.6.4 (or the latest patched release for your respective branch) resolves the vulnerability.

Is nokogiri affected?

Yes, nokogiri is affected in releases prior to 1.6.6.4. Upgrade your dependency to 1.6.6.4 or later.

What CWE is associated with CVE-2015-1819?

CVE-2015-1819 is classified under CWE-776: Improper Restriction of Recursive Entity References in DTDs ('XML Entity Expansion') (The product uses XML documents and allows their structure to be defined with a Document Type Definition (DTD), but it does not properly control the number of recursive definitions of entities.).

How can I check RubyGems dependencies for CVE-2015-1819?

Run the dependency tree command: 'inspect dependencies for nokogiri'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.

Machine-readable OSV JSON OSV v1.5 Schema

Normalized schema output

View Raw JSON

{
  "schema_version" : "1.4.0",
  "id" : "GHSA-q7wx-62r7-j2x7",
  "modified" : "2023-03-14T19:07:20Z",
  "published" : "2018-08-08T22:31:12Z",
  "aliases" : [ "CVE-2015-1819" ],
  "summary" : "Nokogiri vulnerable to libxml XML Entity Expansion",
  "details" : "The xmlreader in libxml allows remote attackers to cause a denial of service (memory consumption) via crafted XML data, related to an XML Entity Expansion (XEE) attack.",
  "severity" : [ ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "RubyGems",
      "name" : "nokogiri"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "1.6.6.0"
      }, {
        "fixed" : "1.6.6.4"
      } ]
    } ],
    "database_specific" : {
      "last_known_affected_version_range" : "<= 1.6.6.3"
    }
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2015-1819"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/sparklemotion/nokogiri/issues/1374"
  }, {
    "type" : "WEB",
    "url" : "https://git.gnome.org/browse/libxml2/commit/?id=213f1fe0d76d30eaed6e5853057defc43e6df2c9"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/rubysec/ruby-advisory-db/blob/master/gems/nokogiri/CVE-2015-1819.yml"
  }, {
    "type" : "WEB",
    "url" : "https://security.gentoo.org/glsa/201507-08"
  }, {
    "type" : "WEB",
    "url" : "https://security.gentoo.org/glsa/201701-37"
  }, {
    "type" : "WEB",
    "url" : "https://support.apple.com/HT206166"
  }, {
    "type" : "WEB",
    "url" : "https://support.apple.com/HT206167"
  }, {
    "type" : "WEB",
    "url" : "https://support.apple.com/HT206168"
  }, {
    "type" : "WEB",
    "url" : "https://support.apple.com/HT206169"
  }, {
    "type" : "WEB",
    "url" : "http://lists.apple.com/archives/security-announce/2016/Mar/msg00000.html"
  }, {
    "type" : "WEB",
    "url" : "http://lists.apple.com/archives/security-announce/2016/Mar/msg00001.html"
  }, {
    "type" : "WEB",
    "url" : "http://lists.apple.com/archives/security-announce/2016/Mar/msg00002.html"
  }, {
    "type" : "WEB",
    "url" : "http://lists.apple.com/archives/security-announce/2016/Mar/msg00004.html"
  }, {
    "type" : "WEB",
    "url" : "http://lists.fedoraproject.org/pipermail/package-announce/2015-November/172710.html"
  }, {
    "type" : "WEB",
    "url" : "http://lists.fedoraproject.org/pipermail/package-announce/2015-November/172943.html"
  }, {
    "type" : "WEB",
    "url" : "http://lists.opensuse.org/opensuse-updates/2015-12/msg00120.html"
  }, {
    "type" : "WEB",
    "url" : "http://lists.opensuse.org/opensuse-updates/2016-01/msg00031.html"
  }, {
    "type" : "WEB",
    "url" : "http://rhn.redhat.com/errata/RHSA-2015-1419.html"
  }, {
    "type" : "WEB",
    "url" : "http://rhn.redhat.com/errata/RHSA-2015-2550.html"
  }, {
    "type" : "WEB",
    "url" : "http://www.debian.org/security/2015/dsa-3430"
  }, {
    "type" : "WEB",
    "url" : "http://www.oracle.com/technetwork/topics/security/bulletinoct2015-2511968.html"
  }, {
    "type" : "WEB",
    "url" : "http://www.oracle.com/technetwork/topics/security/linuxbulletinoct2015-2719645.html"
  }, {
    "type" : "WEB",
    "url" : "http://www.ubuntu.com/usn/USN-2812-1"
  }, {
    "type" : "WEB",
    "url" : "http://xmlsoft.org/news.html"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-776" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2020-06-16T21:51:25Z",
    "nvd_published_at" : null
  }
}

Advisory Metadata

Source ID: GHSA-q7wx-62r7-j2x7
Schema Version: 1.4.0
Published: 2018-08-08 22:31
Last Modified: 2023-03-14 19:07
Database Record File: advisories/github-reviewed/2018/08/GHSA-q7wx-62r7-j2x7/GHSA-q7wx-62r7-j2x7.json