CVE-2020-2252: Mailer Improper Validation Of Certificate With Vulnerability
MODERATECVE-2020-2252 is a MODERATE (CVSS 4.8) improper validation of certificate with vulnerability (CWE-295: Improper Certificate Validation) affecting Mailer libraries in the Maven ecosystem. The issue involves improper validation of certificate with host mismatch in jenkins mailer plugin. Remediation is available by upgrading affected packages to version 1.32.1, 1.31.1, 1.29.1.
CVE-2020-2252 at a Glance
Security Impact
CVSS: 4.8
The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N).
How to Fix CVE-2020-2252
To remediate this vulnerability, upgrade all affected Mailer 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.jenkins-ci.plugins</groupId>
<artifactId>mailer</artifactId>
<version>1.32.1</version>
</dependency><dependency>
<groupId>org.jenkins-ci.plugins</groupId>
<artifactId>mailer</artifactId>
<version>1.31.1</version>
</dependency><dependency>
<groupId>org.jenkins-ci.plugins</groupId>
<artifactId>mailer</artifactId>
<version>1.29.1</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.jenkins-ci.pluginsHow to Check if You Are Affected
To determine whether your Java application is affected by CVE-2020-2252, inspect your build dependencies using the Maven Dependency Plugin:
mvn dependency:tree -Dincludes=org.jenkins-ci.pluginsAnalyze the terminal output to locate any version of Mailer in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 1.32.1), your application is affected.
Note: The mvn dependency:tree -Dincludes=org.jenkins-ci.plugins 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-295: Improper Certificate Validation, where the product does not validate, or incorrectly validates, a certificate. In Mailer, 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-2020-2252 Affected Mailer Versions
3 component(s)| Product / Package | Ecosystem | Affected Versions | Fixed Version |
|---|---|---|---|
|
org.jenkins-ci.plugins:mailer
|
Maven |
≥ 1.32
< 1.32.1
All 1 versions
1.32
|
1.32.1
|
|
org.jenkins-ci.plugins:mailer
|
Maven |
≥ 1.30
< 1.31.1
|
1.31.1
|
|
org.jenkins-ci.plugins:mailer
|
Maven |
< 1.29.1
|
1.29.1
|
References
Frequently Asked Questions
What is CVE-2020-2252?
Which Mailer versions are affected?
What version fixes CVE-2020-2252?
Is mailer affected?
What is the CVSS score of CVE-2020-2252?
What CWE is associated with CVE-2020-2252?
How can I check Maven dependencies for CVE-2020-2252?
Machine-readable OSV JSON
OSV v1.5 Schema
{
"schema_version" : "1.4.0",
"id" : "GHSA-6fr3-286q-q3cr",
"modified" : "2023-05-23T20:56:20Z",
"published" : "2022-05-24T17:28:25Z",
"aliases" : [ "CVE-2020-2252" ],
"summary" : "Improper Validation of Certificate with Host Mismatch in Jenkins Mailer Plugin",
"details" : "Jenkins Mailer Plugin prior to 1.32.1, 1.31.1, and 1.29.1 does not perform hostname validation when connecting to the configured SMTP server. This lack of validation could be abused using a man-in-the-middle attack to intercept these connections.\n\nMailer Plugin 1.32.1, 1.31.1, and 1.29.1 validates the SMTP hostname when connecting via TLS by default. In Mailer Plugin 1.32 and earlier, administrators can set the Java system property mail.smtp.ssl.checkserveridentity to true on startup to enable this protection.\n\nIn case of problems, this protection can be disabled again by setting the Java system property mail.smtp.ssl.checkserveridentity to false on startup.",
"severity" : [ {
"type" : "CVSS_V3",
"score" : "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N"
} ],
"affected" : [ {
"package" : {
"ecosystem" : "Maven",
"name" : "org.jenkins-ci.plugins:mailer"
},
"ranges" : [ {
"type" : "ECOSYSTEM",
"events" : [ {
"introduced" : "1.32"
}, {
"fixed" : "1.32.1"
} ]
} ],
"versions" : [ "1.32" ]
}, {
"package" : {
"ecosystem" : "Maven",
"name" : "org.jenkins-ci.plugins:mailer"
},
"ranges" : [ {
"type" : "ECOSYSTEM",
"events" : [ {
"introduced" : "1.30"
}, {
"fixed" : "1.31.1"
} ]
} ]
}, {
"package" : {
"ecosystem" : "Maven",
"name" : "org.jenkins-ci.plugins:mailer"
},
"ranges" : [ {
"type" : "ECOSYSTEM",
"events" : [ {
"introduced" : "0"
}, {
"fixed" : "1.29.1"
} ]
} ]
} ],
"references" : [ {
"type" : "ADVISORY",
"url" : "https://nvd.nist.gov/vuln/detail/CVE-2020-2252"
}, {
"type" : "WEB",
"url" : "https://github.com/jenkinsci/mailer-plugin/commit/e1893c6d105669f134ee5c5212ef9f3944d7d00d"
}, {
"type" : "WEB",
"url" : "https://github.com/CVEProject/cvelist/blob/16860a328d970faa6e4350b0fa446f64a52e52ca/2020/2xxx/CVE-2020-2252.json"
}, {
"type" : "WEB",
"url" : "https://www.jenkins.io/security/advisory/2020-09-16/#SECURITY-1813"
}, {
"type" : "WEB",
"url" : "http://www.openwall.com/lists/oss-security/2020/09/16/3"
} ],
"database_specific" : {
"cwe_ids" : [ "CWE-295" ],
"severity" : "MODERATE",
"github_reviewed" : true,
"github_reviewed_at" : "2022-06-23T23:19:44Z",
"nvd_published_at" : "2020-09-16T14:15:00Z"
}
}