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CVE-2016-10027: Smack allows the bypass of TLS protections

May 13, 2022 (updated April 21, 2025)

Race condition in the XMPP library in Smack before 4.1.9, when the SecurityMode.required TLS setting has been set, allows man-in-the-middle attackers to bypass TLS protections and trigger use of cleartext for client authentication by stripping the “starttls” feature from a server response.

References

  • community.igniterealtime.org/blogs/ignite/2016/11/22/smack-security-advisory-2016-11-22
  • github.com/advisories/GHSA-66pq-hqv5-228g
  • github.com/igniterealtime/Smack
  • github.com/igniterealtime/Smack/commit/059ee99ba0d5ff7758829acf5a9aeede09ec820b
  • github.com/igniterealtime/Smack/commit/a9d5cd4a611f47123f9561bc5a81a4555fe7cb04
  • issues.igniterealtime.org/projects/SMACK/issues/SMACK-739
  • lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/J4WXAZ4JVJXHMEDDXJVWJHPVBF5QCTZF
  • lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/J4WXAZ4JVJXHMEDDXJVWJHPVBF5QCTZF
  • nvd.nist.gov/vuln/detail/CVE-2016-10027

Code Behaviors & Features

Detect and mitigate CVE-2016-10027 with GitLab Dependency Scanning

Secure your software supply chain by verifying that all open source dependencies used in your projects contain no disclosed vulnerabilities. Learn more about Dependency Scanning →

Affected versions

All versions before 4.1.9

Fixed versions

  • 4.1.9

Solution

Upgrade to version 4.1.9 or above.

Impact 5.9 MEDIUM

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

Learn more about CVSS

Weakness

  • CWE-362: Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

Source file

maven/org.igniterealtime.smack/smack-core/CVE-2016-10027.yml

Spotted a mistake? Edit the file on GitLab.

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