Irisnext: Improper Neutralization of Special Elements used in an Expression Language Statement
CVE-2022-26111 is a high-severity improper neutralization of special elements used in an expression language statement vulnerability in Irisnext from Canon, with a CVSS 3.1 base score of 8.8 out of 10. It can be exploited remotely over the network by an attacker with a low-privileged account, without any action from a user. Affected Irisnext versions: 9.8.28 and earlier. The record does not name a fixed version, so check the vendor advisory. There is no confirmed exploitation so far. EPSS estimates a 4.19% chance of exploitation within 30 days, which is in the top 8.91% of all scored CVEs.
High severity with no evidence of exploitation so far.
What to do
- Check which version of Irisnext you run against the affected versions below, and install the vendor's latest release.
- Read the advisory on varsnext.iriscorporate.com for workarounds and exact fixed builds.
Affected products and versions
Version data comes from NVD's product matching. Confirm against the vendor advisory before deciding you are unaffected.
How the severity score breaks down
- Attack vector
- NetworkCan be exploited remotely over a network, including the internet.
- Attack complexity
- LowNo special conditions are needed; the attack works reliably.
- Privileges required
- LowA basic user account is enough.
- User interaction
- NoneNo action by a victim is required.
- Scope
- UnchangedImpact stays within the vulnerable component.
- Confidentiality
- HighAll data handled by the component can be read.
- Integrity
- HighData or code can be modified at will.
- Availability
- HighThe component can be taken down completely.
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H. Scored by NVD.
| Scoring system | Score | Severity | Scored by |
|---|---|---|---|
| CVSS 3.1 | 8.8 | High | NVD |
| CVSS 2.0 | 9.0 | High | NVD |
Official description
The BeanShell components of IRISNext through 9.8.28 allow execution of arbitrary commands on the target server by creating a custom search (or editing an existing/predefined search) of the documents. The search components permit adding BeanShell expressions that result in Remote Code Execution in the context of the IRISNext application user, running on the web server.
Source: the CVE record as published by its numbering authority, via NVD and CVE.org.
The underlying weakness: Improper Neutralization of Special Elements used in an Expression Language Statement
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 developers prevent this class of flaw
- Avoid adding user-controlled data into an expression interpreter when possible.
- 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
- 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.
Timeline
- CVE record published.
- Record last changed materially (score, affected products, status or references).
References
Advisories
- varsnext.iriscorporate.com/Product
Technical write-ups (may include proof of concept)
- github.com/post-cyberlabs/CVE-Advisory/blob/main/CVE-2022-26111.pdfExploit, Third Party Advisory
Recent Improper Neutralization of Special Elements used in an Expression Language Statement vulnerabilities
- 7.2 High severity
- 7.2 High severity
- 9.8 Critical severity
- 10.0 Critical severity
- 9.0 Critical severity
- 10.0 Critical severity
Apache Log4j2 Remote Code Execution Exploited
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