CVE-2023-26438

Description

External service lookups for a number of protocols were vulnerable to a time-of-check/time-of-use (TOCTOU) weakness, involving the JDK DNS cache. Attackers that were timing DNS cache expiry correctly were able to inject configuration that would bypass existing network deny-lists. Attackers could exploit this weakness to discover the existence of restricted network infrastructure and service availability. Improvements were made to include deny-lists not only during the check of the provided connection data, but also during use. No publicly available exploits are known.

Weakness classification

• security@open-xchange.com: CWE-918
• nvd@nist.gov: CWE-367

Primary references

• security@open-xchange.com — Third Party Advisory, VDB Entry
• security@open-xchange.com — Mailing List, Third Party Advisory
• security@open-xchange.com
• security@open-xchange.com — Release Notes
• af854a3a-2127-422b-91ae-364da2661108 — Third Party Advisory, VDB Entry
• af854a3a-2127-422b-91ae-364da2661108 — Mailing List, Third Party Advisory
• af854a3a-2127-422b-91ae-364da2661108
• af854a3a-2127-422b-91ae-364da2661108 — Release Notes