CVE-2020-8840: Jackson databind Deserialization Of Untrusted Data Vulnerability

CRITICAL
Advisory Identifier: GHSA-4w82-r329-3q67
Share
CVSS 9.8
CWE-502
Published
Advisory Summary

CVE-2020-8840 is a CRITICAL (CVSS 9.8) deserialization of untrusted data vulnerability (CWE-502: Deserialization of Untrusted Data) affecting Jackson databind libraries in the Maven ecosystem. The issue involves deserialization of untrusted data in jackson-databind. Remediation is available by upgrading affected packages to version 2.6.7.4, 2.7.9.7, 2.8.11.5, 2.9.10.3.

CVE-2020-8840 at a Glance

CVE Identifier CVE-2020-8840
GHSA Identifier GHSA-4w82-r329-3q67
Severity CRITICAL
CVSS v3.1 Base Score 9.8
CWE Classification CWE-502: Deserialization of Untrusted Data
Affected Product Jackson databind
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-2020-8840

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

com.fasterxml.jackson.core:jackson-databind fixed: 2.6.7.4 
<dependency>
    <groupId>com.fasterxml.jackson.core</groupId>
    <artifactId>jackson-databind</artifactId>
    <version>2.6.7.4</version>
</dependency>
com.fasterxml.jackson.core:jackson-databind fixed: 2.7.9.7 
<dependency>
    <groupId>com.fasterxml.jackson.core</groupId>
    <artifactId>jackson-databind</artifactId>
    <version>2.7.9.7</version>
</dependency>
com.fasterxml.jackson.core:jackson-databind fixed: 2.8.11.5 
<dependency>
    <groupId>com.fasterxml.jackson.core</groupId>
    <artifactId>jackson-databind</artifactId>
    <version>2.8.11.5</version>
</dependency>
com.fasterxml.jackson.core:jackson-databind fixed: 2.9.10.3 
<dependency>
    <groupId>com.fasterxml.jackson.core</groupId>
    <artifactId>jackson-databind</artifactId>
    <version>2.9.10.3</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=com.fasterxml.jackson.core

How to Check if You Are Affected

To determine whether your Java application is affected by CVE-2020-8840, inspect your build dependencies using the Maven Dependency Plugin:

mvn dependency:tree -Dincludes=com.fasterxml.jackson.core

Analyze the terminal output to locate any version of Jackson databind in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 2.6.7.4), your application is affected.

Note: The mvn dependency:tree -Dincludes=com.fasterxml.jackson.core 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-502: Deserialization of Untrusted Data, where the product deserializes untrusted data without sufficiently ensuring that the resulting data will be valid. In Jackson databind, 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

FasterXML jackson-databind 2.x before 2.6.7.4, 2.7.x before 2.7.9.7, 2.8.x before 2.8.11.5 and 2.9.x before 2.9.10.2 lacks certain xbean-reflect/JNDI blocking, as demonstrated by org.apache.xbean.propertyeditor.JndiConverter.

CVE-2020-8840 Affected Jackson databind Versions

4 component(s)
Fixed Versions:
2.6.7.42.7.9.72.8.11.52.9.10.3
Product / Package Ecosystem Affected Versions Fixed Version
com.fasterxml.jackson.core:jackson-databind
maven/com.fasterxml.jackson.core/jackson-databind
Maven
≥ 2.0.0
< 2.6.7.4
2.6.7.4
com.fasterxml.jackson.core:jackson-databind
maven/com.fasterxml.jackson.core/jackson-databind
Maven
≥ 2.7.0
< 2.7.9.7
2.7.9.7
com.fasterxml.jackson.core:jackson-databind
maven/com.fasterxml.jackson.core/jackson-databind
Maven
≥ 2.8.0
< 2.8.11.5
2.8.11.5
com.fasterxml.jackson.core:jackson-databind
maven/com.fasterxml.jackson.core/jackson-databind
Maven
≥ 2.9.0
< 2.9.10.3
2.9.10.3

References

NVD — CVE-2020-8840 NVD
https://nvd.nist.gov/vuln/detail/CVE-2020-8840
Jackson databind Source Repository REPOSITORY
https://github.com/FasterXML/jackson-databind/issues/2620
Security Fix Commit FIX COMMIT
https://github.com/FasterXML/jackson-databind/commit/74aba4042fce35ee0b91bd2847e788c10040d78b
Security Fix Commit FIX COMMIT
https://github.com/FasterXML/jackson-databind/commit/914e7c9f2cb8ce66724bf26a72adc7e958992497
Security Fix Commit FIX COMMIT
https://github.com/FasterXML/jackson-databind/commit/9bb52c7122271df75435ec7e66ecf6b02b1ee14f
lists.apache.org/thread.html/ra275f2... WEB
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Jackson databind Security Information SECURITY
https://security.netapp.com/advisory/ntap-20200327-0002
Jackson databind Security Information SECURITY
https://www.oracle.com/security-alerts/cpuapr2020.html
Jackson databind Security Information SECURITY
https://www.oracle.com/security-alerts/cpuoct2020.html
Jackson databind Source Repository REPOSITORY
https://github.com/FasterXML/jackson-databind
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Jackson databind Security Information SECURITY
http://www.huawei.com/en/psirt/security-advisories/huawei-sa-20200610-01-fastjason-en

Frequently Asked Questions

What is CVE-2020-8840?
CVE-2020-8840 is a security vulnerability in Jackson databind involving Deserialization of Untrusted Data in jackson-databind under CWE-502: Deserialization of Untrusted Data.
Which Jackson databind versions are affected?
Affected versions include releases prior to 2.6.7.4, 2.7.9.7, 2.8.11.5, 2.9.10.3 across affected packages: com.fasterxml.jackson.core:jackson-databind.
What version fixes CVE-2020-8840?
Upgrading to 2.6.7.4, 2.7.9.7, 2.8.11.5, 2.9.10.3 (or the latest patched release for your respective branch) resolves the vulnerability.
Is jackson-databind affected?
Yes, com.fasterxml.jackson.core:jackson-databind is affected in releases prior to 2.6.7.4, 2.7.9.7, 2.8.11.5, 2.9.10.3. Upgrade your dependency to 2.6.7.4, 2.7.9.7, 2.8.11.5, 2.9.10.3 or later.
What is the CVSS score of CVE-2020-8840?
CVE-2020-8840 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-2020-8840?
CVE-2020-8840 is classified under CWE-502: Deserialization of Untrusted Data (The product deserializes untrusted data without sufficiently ensuring that the resulting data will be valid.).
How can I check Maven dependencies for CVE-2020-8840?
Run the dependency tree command: 'mvn dependency:tree -Dincludes=com.fasterxml.jackson.core'. 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-4w82-r329-3q67",
  "modified" : "2023-06-08T19:02:11Z",
  "published" : "2020-03-04T20:52:14Z",
  "aliases" : [ "CVE-2020-8840" ],
  "summary" : "Deserialization of Untrusted Data in jackson-databind",
  "details" : "FasterXML jackson-databind 2.x before 2.6.7.4, 2.7.x before 2.7.9.7, 2.8.x before 2.8.11.5 and 2.9.x before 2.9.10.2 lacks certain xbean-reflect/JNDI blocking, as demonstrated by org.apache.xbean.propertyeditor.JndiConverter.",
  "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" : "com.fasterxml.jackson.core:jackson-databind"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "2.0.0"
      }, {
        "fixed" : "2.6.7.4"
      } ]
    } ],
    "database_specific" : {
      "last_known_affected_version_range" : "<= 2.6.7.3"
    }
  }, {
    "package" : {
      "ecosystem" : "Maven",
      "name" : "com.fasterxml.jackson.core:jackson-databind"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "2.7.0"
      }, {
        "fixed" : "2.7.9.7"
      } ]
    } ],
    "database_specific" : {
      "last_known_affected_version_range" : "<= 2.7.9.6"
    }
  }, {
    "package" : {
      "ecosystem" : "Maven",
      "name" : "com.fasterxml.jackson.core:jackson-databind"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "2.8.0"
      }, {
        "fixed" : "2.8.11.5"
      } ]
    } ],
    "database_specific" : {
      "last_known_affected_version_range" : "<= 2.8.11.4"
    }
  }, {
    "package" : {
      "ecosystem" : "Maven",
      "name" : "com.fasterxml.jackson.core:jackson-databind"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "2.9.0"
      }, {
        "fixed" : "2.9.10.3"
      } ]
    } ],
    "database_specific" : {
      "last_known_affected_version_range" : "<= 2.9.10.2"
    }
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2020-8840"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/FasterXML/jackson-databind/issues/2620"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/FasterXML/jackson-databind/commit/74aba4042fce35ee0b91bd2847e788c10040d78b"
  }, {
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    "url" : "https://github.com/FasterXML/jackson-databind/commit/914e7c9f2cb8ce66724bf26a72adc7e958992497"
  }, {
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  }, {
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    "url" : "https://lists.apache.org/thread.html/ra275f29615f35d5b40106d1582a41e5388b2a5131564e9e01a572987@%3Cdev.ranger.apache.org%3E"
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  "database_specific" : {
    "cwe_ids" : [ "CWE-502" ],
    "severity" : "CRITICAL",
    "github_reviewed" : true,
    "github_reviewed_at" : "2020-02-25T20:56:51Z",
    "nvd_published_at" : "2020-02-10T21:56:00Z"
  }
}