CVE-2019-19899: Pebble project Pebble Templates Improper Input Validation Vulnerability

CRITICAL
Advisory Identifier: GHSA-83m8-7hj8-ff5w
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CVSS 9.8
CWE-20 CWE-862
Published
Advisory Summary

CVE-2019-19899 is a CRITICAL (CVSS 9.8) pebble templates improper input validation vulnerability (CWE-20: Improper Input Validation) affecting Pebble project libraries in the Maven ecosystem. The issue involves pebble templates improper input validation vulnerability. Remediation is available by upgrading affected packages to version 3.1.4.

CVE-2019-19899 at a Glance

CVE Identifier CVE-2019-19899
GHSA Identifier GHSA-83m8-7hj8-ff5w
Severity CRITICAL
CVSS v3.1 Base Score 9.8
CWE Classification CWE-20: Improper Input Validation
Affected Product Pebble project
Package Ecosystem Maven
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-2019-19899

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

io.pebbletemplates:pebble-project fixed: 3.1.4 
<dependency>
    <groupId>io.pebbletemplates</groupId>
    <artifactId>pebble-project</artifactId>
    <version>3.1.4</version>
</dependency>
Verify Direct and Transitive Dependencies

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

mvn dependency:tree -Dincludes=io.pebbletemplates

How to Check if You Are Affected

To determine whether your Java application is affected by CVE-2019-19899, inspect your build dependencies using the Maven Dependency Plugin:

mvn dependency:tree -Dincludes=io.pebbletemplates

Analyze the terminal output to locate any version of Pebble project in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 3.1.4), your application is affected.

Note: The mvn dependency:tree -Dincludes=io.pebbletemplates command inspects the resolved dependency graph declared in your project's POM files; it does not perform automated security scanning or inspect runtime dynamic classpaths. Always verify runtime container classpaths and shaded JARs.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-20: Improper Input Validation, where the product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly. In Pebble project, 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

Pebble Templates prior to 3.1.4 allows attackers to bypass a protection mechanism (intended to block access to instances of java.lang.Class) because getClass is accessible via the public static java.lang.Class `java.lang.Class.forName(java.lang.Module,java.lang.String)` signature.

CVE-2019-19899 Affected Pebble project Versions

1 component(s)
Fixed Versions:
3.1.4
Product / Package Ecosystem Affected Versions Fixed Version
io.pebbletemplates:pebble-project
maven/io.pebbletemplates/pebble-project
Maven
< 3.1.4
3.1.4

References

NVD — CVE-2019-19899 NVD
https://nvd.nist.gov/vuln/detail/CVE-2019-19899
Pebble project Source Repository REPOSITORY
https://github.com/PebbleTemplates/pebble/issues/493
Pebble project Source Repository REPOSITORY
https://github.com/PebbleTemplates/pebble/pull/511
Pebble project Source Repository REPOSITORY
https://github.com/PebbleTemplates/pebble
research.securitum.com/server-side-templat... WEB
https://research.securitum.com/server-side-template-injection-on-the-example-of-pebble

Frequently Asked Questions

What is CVE-2019-19899?
CVE-2019-19899 is a security vulnerability in Pebble project involving Pebble Templates Improper Input Validation vulnerability under CWE-20: Improper Input Validation.
Which Pebble project versions are affected?
Affected versions include releases prior to 3.1.4 across affected packages: io.pebbletemplates:pebble-project.
What version fixes CVE-2019-19899?
Upgrading to 3.1.4 (or the latest patched release for your respective branch) resolves the vulnerability.
Is pebble-project affected?
Yes, io.pebbletemplates:pebble-project is affected in releases prior to 3.1.4. Upgrade your dependency to 3.1.4 or later.
What is the CVSS score of CVE-2019-19899?
CVE-2019-19899 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-2019-19899?
CVE-2019-19899 is classified under CWE-20: Improper Input Validation (The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.).
How can I check Maven dependencies for CVE-2019-19899?
Run the dependency tree command: 'mvn dependency:tree -Dincludes=io.pebbletemplates'. 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-83m8-7hj8-ff5w",
  "modified" : "2023-09-26T20:06:30Z",
  "published" : "2022-05-24T22:01:17Z",
  "aliases" : [ "CVE-2019-19899" ],
  "summary" : "Pebble Templates Improper Input Validation vulnerability",
  "details" : "Pebble Templates prior to 3.1.4 allows attackers to bypass a protection mechanism (intended to block access to instances of java.lang.Class) because getClass is accessible via the public static java.lang.Class `java.lang.Class.forName(java.lang.Module,java.lang.String)` signature.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Maven",
      "name" : "io.pebbletemplates:pebble-project"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "3.1.4"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2019-19899"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/PebbleTemplates/pebble/issues/493"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/PebbleTemplates/pebble/pull/511"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/PebbleTemplates/pebble"
  }, {
    "type" : "WEB",
    "url" : "https://research.securitum.com/server-side-template-injection-on-the-example-of-pebble"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-20", "CWE-862" ],
    "severity" : "CRITICAL",
    "github_reviewed" : true,
    "github_reviewed_at" : "2023-07-18T21:25:57Z",
    "nvd_published_at" : "2019-12-19T00:15:00Z"
  }
}