CVE-2019-10772: Enshrined/svg sanitize Sanitizer Bypass Vulnerability

MODERATE
Advisory Identifier: GHSA-8rc5-hx3v-2jg7
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CVSS 6.1
CWE-79
Published
Advisory Summary

CVE-2019-10772 is a MODERATE (CVSS 6.1) sanitizer bypass vulnerability (CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')) affecting Enshrined/svg sanitize libraries in the Packagist ecosystem. The issue involves sanitizer bypass in svg-sanitizer. Remediation is available by upgrading affected packages to version 0.13.1.

CVE-2019-10772 at a Glance

CVE Identifier CVE-2019-10772
GHSA Identifier GHSA-8rc5-hx3v-2jg7
Severity MODERATE
CVSS v3.1 Base Score 6.1
CWE Classification CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Affected Product Enshrined/svg sanitize
Package Ecosystem Packagist
Published Date
Last Updated

Security Impact

CVSS: 6.1

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N).

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

How to Fix CVE-2019-10772

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

enshrined/svg-sanitize fixed: 0.13.1 
Upgrade enshrined/svg-sanitize to 0.13.1
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 enshrined/svg-sanitize

How to Check if You Are Affected

To determine whether your application is affected by CVE-2019-10772, inspect your project dependencies for Enshrined/svg sanitize:

inspect dependencies for enshrined/svg-sanitize

Analyze the terminal output to locate any version of Enshrined/svg sanitize in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 0.13.1), 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-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting'), where the product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. In Enshrined/svg sanitize, 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

It is possible to bypass enshrined/svg-sanitize before 0.13.1 using the "xlink:href" attribute due to mishandling of the xlink namespace by the sanitizer.

CVE-2019-10772 Affected Enshrined/svg sanitize Versions

1 component(s)
Fixed Versions:
0.13.1
Product / Package Ecosystem Affected Versions Fixed Version
enshrined/svg-sanitize
 Packagist
< 0.13.1
0.13.1

References

NVD — CVE-2019-10772 NVD
https://nvd.nist.gov/vuln/detail/CVE-2019-10772
Security Fix Commit FIX COMMIT
https://github.com/darylldoyle/svg-sanitizer/commit/6add43e5c5649bc40e3afcb68c522720dcb336f9
snyk.io/vuln/snyk-php-enshr... WEB
https://snyk.io/vuln/SNYK-PHP-ENSHRINEDSVGSANITIZE-536969

Frequently Asked Questions

What is CVE-2019-10772?
CVE-2019-10772 is a security vulnerability in Enshrined/svg sanitize involving Sanitizer bypass in svg-sanitizer under CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting').
Which Enshrined/svg sanitize versions are affected?
Affected versions include releases prior to 0.13.1 across affected packages: enshrined/svg-sanitize.
What version fixes CVE-2019-10772?
Upgrading to 0.13.1 (or the latest patched release for your respective branch) resolves the vulnerability.
Is enshrined/svg-sanitize affected?
Yes, enshrined/svg-sanitize is affected in releases prior to 0.13.1. Upgrade your dependency to 0.13.1 or later.
What is the CVSS score of CVE-2019-10772?
CVE-2019-10772 has a CVSS v3.1 base score of 6.1 (MODERATE) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.
What CWE is associated with CVE-2019-10772?
CVE-2019-10772 is classified under CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') (The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.).
How can I check Packagist dependencies for CVE-2019-10772?
Run the dependency tree command: 'inspect dependencies for enshrined/svg-sanitize'. 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-8rc5-hx3v-2jg7",
  "modified" : "2021-08-19T19:25:06Z",
  "published" : "2020-02-27T20:36:29Z",
  "aliases" : [ "CVE-2019-10772" ],
  "summary" : "Sanitizer bypass in svg-sanitizer",
  "details" : "It is possible to bypass enshrined/svg-sanitize before 0.13.1 using the \"xlink:href\" attribute due to mishandling of the xlink namespace by the sanitizer.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Packagist",
      "name" : "enshrined/svg-sanitize"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "0.13.1"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2019-10772"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/darylldoyle/svg-sanitizer/commit/6add43e5c5649bc40e3afcb68c522720dcb336f9"
  }, {
    "type" : "WEB",
    "url" : "https://snyk.io/vuln/SNYK-PHP-ENSHRINEDSVGSANITIZE-536969"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-79" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2020-02-25T15:32:43Z",
    "nvd_published_at" : null
  }
}