CVE-2021-26084
In affected versions of Confluence Server and Data Center, an OGNL injection vulnerability exists that would allow an unauthenticated attacker to execute…
- Severity
- 9.8 / 10
- Critical · CVSS 3.1
- Exploit chance (EPSS)
- 100.00%
- Chance of exploitation in the next 30 days. Higher than 99.99% of scored vulnerabilities.
- Known exploited
- Yes
- In CISA's catalog since Nov 3, 2021
- Weakness
- CWE-917 Improper Neutralization of Special Elements used in an Expression Language Statement ('Expression Language Injection')
- CWE-917 Improper Neutralization of Special Elements used in an Expression Language Statement ('Expression Language Injection')
- Fix
- None yet
- No fixed version published
Description
In affected versions of Confluence Server and Data Center, an OGNL injection vulnerability exists that would allow an unauthenticated attacker to execute arbitrary code on a Confluence Server or Data Center instance. The affected versions are before version 6.13.23, from version 6.14.0 before 7.4.11, from version 7.5.0 before 7.11.6, and from version 7.12.0 before 7.12.5.
How to fix
No fixed version has been published yet. Until one is, remove or replace the package, or turn off or isolate the affected feature. This page updates when a fix ships.
Severity breakdown
CVSS 3.1 9.8
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- Attack vector
- Network
- Attack complexity
- Low
- Privileges required
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- High
Weakness
CWE-917: Improper Neutralization of Special Elements used in an Expression Language Statement ('Expression Language Injection')
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.
How to prevent it
- Architecture and Design: Avoid adding user-controlled data into an expression interpreter when possible.
- Implementation: If user-controlled data must be added to an expression interpreter, one or more of the following should be performed: Validate that the user input will not evaluate as an expression Encode the user input in a way that ensures it is not evaluated as an expression
- System Configuration, Operation: The framework or tooling might allow the developer to disable or deactivate the processing of EL expressions, such as setting the isELIgnored attribute for a JSP page to "true".
CWE-917: Improper Neutralization of Special Elements used in an Expression Language Statement ('Expression Language Injection')
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.
How to prevent it
- Architecture and Design: Avoid adding user-controlled data into an expression interpreter when possible.
- Implementation: If user-controlled data must be added to an expression interpreter, one or more of the following should be performed: Validate that the user input will not evaluate as an expression Encode the user input in a way that ensures it is not evaluated as an expression
- System Configuration, Operation: The framework or tooling might allow the developer to disable or deactivate the processing of EL expressions, such as setting the isELIgnored attribute for a JSP page to "true".
References
Advisories
Other links
Timeline
- Published
- Added to CISA's Known Exploited Vulnerabilities catalog
- Remediation due for U.S. federal agencies
- Last updated by the source
- Latest EPSS score
Related advisories
| Advisory | Severity | Why it's related |
|---|---|---|
| GHSA-pm35-fqvh-cq5g n8n: Legacy Expression Evaluator Sanitizer Bypass Leads to Authenticated Code Execution | High | Same weakness, CWE-917 |
| GHSA-cfj9-2vgr-hpxp Jenkins Script Security Plugin has a script security bypass vulnerability | High | Same weakness, CWE-917 |
| GHSA-3mfm-83xf-c92r Handlebars.js has JavaScript Injection via AST Type Confusion by tampering @partial-block | High | Same weakness, CWE-917 |
| GHSA-67jx-r9pv-98rj Traefik has Knative Ingress Rule Injection that Allows Host Restriction Bypass | High | Same weakness, CWE-917 |
| GHSA-8w3p-qh3x-6gjr TYPO3 CMS vulnerable to Sensitive Information Disclosure via YAML Placeholder Expressions in Site Configuration | Medium | Same weakness, CWE-917 |
| CVE-2022-26134 In affected versions of Confluence Server and Data Center, an OGNL injection vulnerability exists that would allow an unauthenticated attacker to execute… | Critical Known exploited | Same weakness, CWE-917 |
| GHSA-v8j6-6c2r-r27c Expression Language Injection in Apache Struts | Critical | Same weakness, CWE-917 |
| GHSA-6v73-fgf6-w5j7 Spring Cloud Function Code Injection with a specially crafted SpEL as a routing expression | Critical Known exploited | Same weakness, CWE-917 |
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