CVE-2020-10799: Svglib SVGlib Vulnerable To XXE Attacks Vulnerability

CRITICAL
Advisory Identifier: GHSA-3vcg-8p79-jpcv
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CVSS 9.8
CWE-611
Published
Advisory Summary

CVE-2020-10799 is a CRITICAL (CVSS 9.8) svglib vulnerable to xxe attacks vulnerability (CWE-611: Improper Restriction of XML External Entity Reference) affecting Svglib libraries in the PyPI ecosystem. The issue involves svglib vulnerable to xxe attacks. Remediation is available by upgrading affected packages to version 0.9.4.

CVE-2020-10799 at a Glance

CVE Identifier CVE-2020-10799
GHSA Identifier GHSA-3vcg-8p79-jpcv
Severity CRITICAL
CVSS v3.1 Base Score 9.8
CWE Classification CWE-611: Improper Restriction of XML External Entity Reference
Affected Product Svglib
Package Ecosystem PyPI
Published Date
Last Updated

Security Impact

CVSS: 9.8

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:N/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 None (UI:N)
Scope Unchanged (S:U)
Confidentiality High (C:H)
Integrity High (I:H)
Availability High (A:H)

How to Fix CVE-2020-10799

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

svglib fixed: 0.9.4 
pip install svglib>=0.9.4
Verify Direct and Transitive Dependencies

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

pip show svglib

How to Check if You Are Affected

To determine whether your Python environment is affected by CVE-2020-10799, inspect your installed packages using pip:

pip show svglib

Analyze the terminal output to locate any version of Svglib in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 0.9.4), your application is affected.

Note: The pip show svglib command checks currently installed packages in your active Python environment.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-611: Improper Restriction of XML External Entity Reference, where the product processes an xml document that can contain xml entities with uris that resolve to documents outside of the intended sphere of control, causing the product to embed incorrect documents into its output. In Svglib, 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 svglib package through 0.9.3 for Python allows XXE attacks via an `svg2rlg` call.

CVE-2020-10799 Affected Svglib Versions

1 component(s)
Fixed Versions:
0.9.4
Product / Package Ecosystem Affected Versions Fixed Version
svglib
pypi/svglib
PyPI
< 0.9.4
0.9.4

References

NVD — CVE-2020-10799 NVD
https://nvd.nist.gov/vuln/detail/CVE-2020-10799
Svglib Source Repository REPOSITORY
https://github.com/deeplook/svglib/issues/229
Security Fix Commit FIX COMMIT
https://github.com/deeplook/svglib/commit/35686a130ed260c71a382a8f83d41fd31a46704d
GitHub Advisory / Wiki ADVISORY
https://github.com/advisories/GHSA-3vcg-8p79-jpcv
Svglib Source Repository REPOSITORY
https://github.com/deeplook/svglib
Svglib Source Repository REPOSITORY
https://github.com/pypa/advisory-database/tree/main/vulns/svglib/PYSEC-2020-111.yaml

Frequently Asked Questions

What is CVE-2020-10799?
CVE-2020-10799 is a security vulnerability in Svglib involving SVGlib Vulnerable to XXE Attacks under CWE-611: Improper Restriction of XML External Entity Reference.
Which Svglib versions are affected?
Affected versions include releases prior to 0.9.4 across affected packages: svglib.
What version fixes CVE-2020-10799?
Upgrading to 0.9.4 (or the latest patched release for your respective branch) resolves the vulnerability.
Is svglib affected?
Yes, svglib is affected in releases prior to 0.9.4. Upgrade your dependency to 0.9.4 or later.
What is the CVSS score of CVE-2020-10799?
CVE-2020-10799 has a CVSS v3.1 base score of 9.8 (CRITICAL) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
What CWE is associated with CVE-2020-10799?
CVE-2020-10799 is classified under CWE-611: Improper Restriction of XML External Entity Reference (The product processes an XML document that can contain XML entities with URIs that resolve to documents outside of the intended sphere of control, causing the product to embed incorrect documents into its output.).
How can I check PyPI dependencies for CVE-2020-10799?
Run the dependency tree command: 'pip show svglib'. 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-3vcg-8p79-jpcv",
  "modified" : "2024-10-28T14:25:11Z",
  "published" : "2021-05-06T18:52:01Z",
  "aliases" : [ "CVE-2020-10799" ],
  "summary" : "SVGlib Vulnerable to XXE Attacks",
  "details" : "The svglib package through 0.9.3 for Python allows XXE attacks via an `svg2rlg` call.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
  }, {
    "type" : "CVSS_V4",
    "score" : "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "PyPI",
      "name" : "svglib"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "0.9.4"
      } ]
    } ],
    "database_specific" : {
      "last_known_affected_version_range" : "<= 0.9.3"
    }
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2020-10799"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/deeplook/svglib/issues/229"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/deeplook/svglib/commit/35686a130ed260c71a382a8f83d41fd31a46704d"
  }, {
    "type" : "ADVISORY",
    "url" : "https://github.com/advisories/GHSA-3vcg-8p79-jpcv"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/deeplook/svglib"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/pypa/advisory-database/tree/main/vulns/svglib/PYSEC-2020-111.yaml"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-611" ],
    "severity" : "CRITICAL",
    "github_reviewed" : true,
    "github_reviewed_at" : "2021-05-05T22:26:32Z",
    "nvd_published_at" : "2020-03-20T23:15:00Z"
  }
}