CVE-2016-4993: Wildfly undertow Improper Neutralization Of CRLF Sequences Vulnerability
MODERATECVE-2016-4993 is a MODERATE (CVSS 6.1) improper neutralization of crlf sequences vulnerability (CWE-93: Improper Neutralization of CRLF Sequences ('CRLF Injection')) affecting Wildfly undertow libraries in the Maven ecosystem. The issue involves improper neutralization of crlf sequences in wildfly undertow. Remediation is available by upgrading affected packages to version 11.0.0.Final.
CVE-2016-4993 at a Glance
Security Impact
CVSS: 6.1
The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N).
How to Fix CVE-2016-4993
To remediate this vulnerability, upgrade all affected Wildfly undertow dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.
<dependency>
<groupId>org.wildfly</groupId>
<artifactId>wildfly-undertow</artifactId>
<version>11.0.0.Final</version>
</dependency>Run the following command in your project directory to verify that all resolved dependencies use the patched release:
mvn dependency:tree -Dincludes=org.wildflyHow to Check if You Are Affected
To determine whether your Java application is affected by CVE-2016-4993, inspect your build dependencies using the Maven Dependency Plugin:
mvn dependency:tree -Dincludes=org.wildflyAnalyze the terminal output to locate any version of Wildfly undertow in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 11.0.0.Final), your application is affected.
Note: The mvn dependency:tree -Dincludes=org.wildfly command inspects the resolved dependency graph declared in your project's POM files; it does not perform automated security scanning or inspect runtime dynamic classpaths. Always verify runtime container classpaths and shaded JARs.
Technical Details
Vulnerability Mechanism & Technical Analysis
This vulnerability is classified under CWE-93: Improper Neutralization of CRLF Sequences ('CRLF Injection'), where the product uses crlf (carriage return line feeds) as a special element, e.g. to separate lines or records, but it does not neutralize or incorrectly neutralizes crlf sequences from inputs. In Wildfly undertow, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.
Source Advisory Statement
CVE-2016-4993 Affected Wildfly undertow Versions
1 component(s)| Product / Package | Ecosystem | Affected Versions | Fixed Version |
|---|---|---|---|
|
org.wildfly:wildfly-undertow
|
Maven |
≥ 10.0.0.Final
< 11.0.0.Final
|
11.0.0.Final
|
References
Frequently Asked Questions
What is CVE-2016-4993?
Which Wildfly undertow versions are affected?
What version fixes CVE-2016-4993?
Is wildfly-undertow affected?
What is the CVSS score of CVE-2016-4993?
What CWE is associated with CVE-2016-4993?
How can I check Maven dependencies for CVE-2016-4993?
Machine-readable OSV JSON
OSV v1.5 Schema
{
"schema_version" : "1.4.0",
"id" : "GHSA-qcqr-hcjq-whfq",
"modified" : "2022-07-12T22:14:44Z",
"published" : "2022-05-17T00:15:12Z",
"aliases" : [ "CVE-2016-4993" ],
"summary" : "Improper Neutralization of CRLF Sequences in Wildfly Undertow",
"details" : "CRLF injection vulnerability in the Undertow web server in WildFly 10.0.0, as used in Red Hat JBoss Enterprise Application Platform (EAP) 7.x before 7.0.2, allows remote attackers to inject arbitrary HTTP headers and conduct HTTP response splitting attacks via unspecified vectors.",
"severity" : [ {
"type" : "CVSS_V3",
"score" : "CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N"
} ],
"affected" : [ {
"package" : {
"ecosystem" : "Maven",
"name" : "org.wildfly:wildfly-undertow"
},
"ranges" : [ {
"type" : "ECOSYSTEM",
"events" : [ {
"introduced" : "10.0.0.Final"
}, {
"fixed" : "11.0.0.Final"
} ]
} ],
"database_specific" : {
"last_known_affected_version_range" : "<= 10.1.0.Final"
}
} ],
"references" : [ {
"type" : "ADVISORY",
"url" : "https://nvd.nist.gov/vuln/detail/CVE-2016-4993"
}, {
"type" : "WEB",
"url" : "https://github.com/undertow-io/undertow/commit/834496fb74ddda2af197940c70d08bab419fdf12"
}, {
"type" : "WEB",
"url" : "https://access.redhat.com/errata/RHSA-2017:3454"
}, {
"type" : "WEB",
"url" : "https://access.redhat.com/errata/RHSA-2017:3455"
}, {
"type" : "WEB",
"url" : "https://access.redhat.com/errata/RHSA-2017:3456"
}, {
"type" : "WEB",
"url" : "https://access.redhat.com/errata/RHSA-2017:3458"
}, {
"type" : "WEB",
"url" : "https://bugzilla.redhat.com/show_bug.cgi?id=1344321"
}, {
"type" : "WEB",
"url" : "https://issues.redhat.com/browse/UNDERTOW-827"
}, {
"type" : "WEB",
"url" : "http://rhn.redhat.com/errata/RHSA-2016-1838.html"
}, {
"type" : "WEB",
"url" : "http://rhn.redhat.com/errata/RHSA-2016-1839.html"
}, {
"type" : "WEB",
"url" : "http://rhn.redhat.com/errata/RHSA-2016-1840.html"
}, {
"type" : "WEB",
"url" : "http://rhn.redhat.com/errata/RHSA-2016-1841.html"
} ],
"database_specific" : {
"cwe_ids" : [ "CWE-93" ],
"severity" : "MODERATE",
"github_reviewed" : true,
"github_reviewed_at" : "2022-07-12T22:14:44Z",
"nvd_published_at" : "2016-09-26T14:59:00Z"
}
}