CVE-2017-5029: Nokogiri Nokogiri Implementation Of Libxslt Lacks Vulnerability

HIGH
Advisory Identifier: GHSA-pf6m-fxpq-fg8v
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CVSS 8.8
CWE-787
Published
Advisory Summary

CVE-2017-5029 is a HIGH (CVSS 8.8) nokogiri implementation of libxslt lacks vulnerability (CWE-787: Out-of-bounds Write) affecting Nokogiri libraries in the RubyGems ecosystem. The issue involves nokogiri implementation of libxslt lacks integer overflow checks. Remediation is available by upgrading affected packages to version 1.7.2.

CVE-2017-5029 at a Glance

CVE Identifier CVE-2017-5029
GHSA Identifier GHSA-pf6m-fxpq-fg8v
Severity HIGH
CVSS v3.1 Base Score 8.8
CWE Classification CWE-787: Out-of-bounds Write
Affected Product Nokogiri
Package Ecosystem RubyGems
Published Date
Last Updated

Security Impact

CVSS: 8.8

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H).

Attack Vector Network (AV:N)
Attack Complexity Low (AC:L)
Privileges Required None (PR:N)
User Interaction Required (UI:R)
Scope Unchanged (S:U)
Confidentiality High (C:H)
Integrity High (I:H)
Availability High (A:H)

How to Fix CVE-2017-5029

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: 1.7.2 
Upgrade nokogiri to 1.7.2
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-2017-5029, 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 1.7.2), 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-787: Out-of-bounds Write, where the product writes data past the end, or before the beginning, of the intended buffer. 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 xsltAddTextString function in transform.c in libxslt 1.1.29, as used in Nokogiri prior to 1.7.2, lacked a check for integer overflow during a size calculation, which allowed a remote attacker to perform an out of bounds memory write via a crafted HTML page.

CVE-2017-5029 Affected Nokogiri Versions

1 component(s)
Fixed Versions:
1.7.2
Product / Package Ecosystem Affected Versions Fixed Version
nokogiri
gem/nokogiri
RubyGems
< 1.7.2
1.7.2

References

NVD — CVE-2017-5029 NVD
https://nvd.nist.gov/vuln/detail/CVE-2017-5029
Nokogiri Source Repository REPOSITORY
https://github.com/sparklemotion/nokogiri/issues/1634
git.gnome.org/browse/libxslt/comm... WEB
https://git.gnome.org/browse/libxslt/commit/?id=08ab2774b870de1c7b5a48693df75e8154addae5
GitHub Advisory / Wiki ADVISORY
https://github.com/advisories/GHSA-pf6m-fxpq-fg8v
Nokogiri Source Repository REPOSITORY
https://github.com/rubysec/ruby-advisory-db/blob/master/gems/nokogiri/CVE-2017-5029.yml
Nokogiri Source Repository REPOSITORY
https://github.com/sparklemotion/nokogiri
Nokogiri Security Information SECURITY
https://ubuntu.com/security/CVE-2017-5029
Nokogiri Security Information SECURITY
https://ubuntu.com/security/notices/USN-3271-1

Frequently Asked Questions

What is CVE-2017-5029?
CVE-2017-5029 is a security vulnerability in Nokogiri involving Nokogiri implementation of libxslt lacks integer overflow checks under CWE-787: Out-of-bounds Write.
Which Nokogiri versions are affected?
Affected versions include releases prior to 1.7.2 across affected packages: nokogiri.
What version fixes CVE-2017-5029?
Upgrading to 1.7.2 (or the latest patched release for your respective branch) resolves the vulnerability.
Is nokogiri affected?
Yes, nokogiri is affected in releases prior to 1.7.2. Upgrade your dependency to 1.7.2 or later.
What is the CVSS score of CVE-2017-5029?
CVE-2017-5029 has a CVSS v3.1 base score of 8.8 (HIGH) with vector string CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.
What CWE is associated with CVE-2017-5029?
CVE-2017-5029 is classified under CWE-787: Out-of-bounds Write (The product writes data past the end, or before the beginning, of the intended buffer.).
How can I check RubyGems dependencies for CVE-2017-5029?
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-pf6m-fxpq-fg8v",
  "modified" : "2023-07-03T23:57:14Z",
  "published" : "2018-07-31T18:21:29Z",
  "aliases" : [ "CVE-2017-5029" ],
  "summary" : "Nokogiri implementation of libxslt lacks integer overflow checks",
  "details" : "The xsltAddTextString function in transform.c in libxslt 1.1.29, as used in Nokogiri prior to 1.7.2, lacked a check for integer overflow during a size calculation, which allowed a remote attacker to perform an out of bounds memory write via a crafted HTML page.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "RubyGems",
      "name" : "nokogiri"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "1.7.2"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2017-5029"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/sparklemotion/nokogiri/issues/1634"
  }, {
    "type" : "WEB",
    "url" : "https://git.gnome.org/browse/libxslt/commit/?id=08ab2774b870de1c7b5a48693df75e8154addae5"
  }, {
    "type" : "ADVISORY",
    "url" : "https://github.com/advisories/GHSA-pf6m-fxpq-fg8v"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/rubysec/ruby-advisory-db/blob/master/gems/nokogiri/CVE-2017-5029.yml"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/sparklemotion/nokogiri"
  }, {
    "type" : "WEB",
    "url" : "https://ubuntu.com/security/CVE-2017-5029"
  }, {
    "type" : "WEB",
    "url" : "https://ubuntu.com/security/notices/USN-3271-1"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-787" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2020-06-16T21:48:58Z",
    "nvd_published_at" : "2017-04-24T23:59:00Z"
  }
}