XML External Entity (XXE) Injection

Affecting org.codehaus.jackson:jackson-mapper-asl artifact, versions [0,]

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Overview

org.codehaus.jackson:jackson-mapper-asl is a high-performance data binding package built on Jackson JSON processor.

Affected versions of this package are vulnerable to XML External Entity (XXE) Injection. Multiple classes including XmlMapper was found to be vulnerabiltiy to XXE, which might allow attackers to have unspecified impact via unknown vectors.

Details

XXE Injection is a type of attack against an application that parses XML input. XML is a markup language that defines a set of rules for encoding documents in a format that is both human-readable and machine-readable. By default, many XML processors allow specification of an external entity, a URI that is dereferenced and evaluated during XML processing. When an XML document is being parsed, the parser can make a request and include the content at the specified URI inside of the XML document.

Attacks can include disclosing local files, which may contain sensitive data such as passwords or private user data, using file: schemes or relative paths in the system identifier.

For example, below is a sample XML document, containing an XML element- username.

<?xml version="1.0" encoding="ISO-8859-1"?>
   <username>John</username>
</xml>

An external XML entity - xxe, is defined using a system identifier and present within a DOCTYPE header. These entities can access local or remote content. For example the below code contains an external XML entity that would fetch the content of /etc/passwd and display it to the user rendered by username.

<?xml version="1.0" encoding="ISO-8859-1"?>
<!DOCTYPE foo [
   <!ENTITY xxe SYSTEM "file:///etc/passwd" >]>
   <username>&xxe;</username>
</xml>

Other XXE Injection attacks can access local resources that may not stop returning data, possibly impacting application availability and leading to Denial of Service.

Remediation

There is no fixed version for org.codehaus.jackson:jackson-mapper-asl.

For org.codehaus.jackson:jackson-all releases supporting jackson-mapper-asl. As a workaround, for 1.9.X release, the javax.xml.XMLConstants.FEATURE_SECURE_PROCESSING setting can be enabled. For 2.x releases, the "javax.xml.stream.isSupportingExternalEntities setting can be set to FALSE.

References

CVSS Score

5.9
medium severity
  • Attack Vector
    Network
  • Attack Complexity
    High
  • Privileges Required
    None
  • User Interaction
    None
  • Scope
    Unchanged
  • Confidentiality
    None
  • Integrity
    High
  • Availability
    None
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N
Credit
Unknown
CVE
CVE-2019-10172
CWE
CWE-611
Snyk ID
SNYK-JAVA-ORGCODEHAUSJACKSON-534878
Disclosed
18 Nov, 2019
Published
19 Nov, 2019