Vulnerabilities
Misconfiguration
Runtime Security
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CVE Vulnerabilities

CVE-2020-17530

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

Published: Dec 11, 2020 | Modified: Jun 03, 2022
CVSS 3.x
9.8
CRITICAL
Source:
NVD
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS 2.x
7.5 HIGH
AV:N/AC:L/Au:N/C:P/I:P/A:P
RedHat/V2
RedHat/V3
8.1 IMPORTANT
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Ubuntu
MEDIUM
Additional information
NVDhttps://nvd.nist.gov/vuln/detail/CVE-2020-17530
CWEhttps://cwe.mitre.org/data/definitions/917.html

Forced OGNL evaluation, when evaluated on raw user input in tag attributes, may lead to remote code execution. Affected software : Apache Struts 2.0.0 - Struts 2.5.25.

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
Struts Apache 2.0.0 (including) 2.5.30 (excluding)
Libstruts1.2-java Ubuntu trusty *

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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