Vulnerability 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.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Open-Xchange | Open-Xchange Appsuite Backend | 7.10.6 |
Related Weaknesses (CWE)
References
- http://packetstormsecurity.com/files/173943/OX-App-Suite-SSRF-SQL-Injection-CrosThird Party AdvisoryVDB Entry
- http://seclists.org/fulldisclosure/2023/Aug/8Mailing ListThird Party Advisory
- https://documentation.open-xchange.com/appsuite/security/advisories/csaf/2023/ox
- https://software.open-xchange.com/products/appsuite/doc/Release_Notes_for_Patch_Release Notes
- http://packetstormsecurity.com/files/173943/OX-App-Suite-SSRF-SQL-Injection-CrosThird Party AdvisoryVDB Entry
- http://seclists.org/fulldisclosure/2023/Aug/8Mailing ListThird Party Advisory
- https://documentation.open-xchange.com/appsuite/security/advisories/csaf/2023/ox
- https://software.open-xchange.com/products/appsuite/doc/Release_Notes_for_Patch_Release Notes
FAQ
What is CVE-2023-26438?
CVE-2023-26438 is a vulnerability with a CVSS score of 4.3 (MEDIUM). 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 ...
How severe is CVE-2023-26438?
CVE-2023-26438 has been rated MEDIUM with a CVSS base score of 4.3/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2023-26438?
Check the references section above for vendor advisories and patch information. Affected products include: Open-Xchange Open-Xchange Appsuite Backend.