GHSA-6fr3-286q-q3cr
Improper Validation of Certificate with Host Mismatch in Jenkins Mailer Plugin
Packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| Maven | org.jenkins-ci.plugins:mailer | >= 1.32, < 1.32.1 | 1.32.1 |
| Maven | org.jenkins-ci.plugins:mailer | >= 1.30, < 1.31.1 | 1.31.1 |
| Maven | org.jenkins-ci.plugins:mailer | < 1.29.1 | 1.29.1 |
Details
As written in the advisory (Markdown source, shown as plain text).
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.
Mailer 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.
In case of problems, this protection can be disabled again by setting the Java system property mail.smtp.ssl.checkserveridentity to false on startup.
References
External links from the advisory. They lead to third-party sites.
- https://nvd.nist.gov/vuln/detail/CVE-2020-2252
- https://github.com/jenkinsci/mailer-plugin/commit/e1893c6d105669f134ee5c5212ef9f3944d7d00d
- https://github.com/CVEProject/cvelist/blob/16860a328d970faa6e4350b0fa446f64a52e52ca/2020/2xxx/CVE-2020-2252.json
- https://www.jenkins.io/security/advisory/2020-09-16/#SECURITY-1813
- http://www.openwall.com/lists/oss-security/2020/09/16/3