Vulnerabilities
Misconfiguration
Runtime Security
Compliance
CVE Vulnerabilities

CVE-2020-7799

Improper Neutralization of Special Elements used in an Expression Language Statement ('Expression Language Injection')

Published: Jan 28, 2020 | Modified: Jul 21, 2021
CVSS 3.x
7.2
HIGH
Source:
NVD
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
CVSS 2.x
9 HIGH
AV:N/AC:L/Au:S/C:C/I:C/A:C
RedHat/V2
RedHat/V3
Ubuntu
Additional information
NVDhttps://nvd.nist.gov/vuln/detail/CVE-2020-7799
CWEhttps://cwe.mitre.org/data/definitions/917.html

An issue was discovered in FusionAuth before 1.11.0. An authenticated user, allowed to edit e-mail templates (Home -> Settings -> Email Templates) or themes (Home -> Settings -> Themes), can execute commands on the underlying operating system by abusing freemarker.template.utility.Execute in the Apache FreeMarker engine that processes custom templates.

Weakness

The product constructs all or part of an expression language (EL) statement in a framework such as a Java Server Page (JSP) using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended EL statement before it is executed.

Affected Software

Name Vendor Start Version End Version
Fusionauth Fusionauth * 1.11.0 (excluding)

Potential Mitigations

  • If user-controlled data must be added to an expression interpreter, one or more of the following should be performed:

References

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