CVE-2023-26438 Server-side request forgery in OX App Suite
Attackers can bypass network deny-lists via DNS cache timing to discover restricted infrastructure and service availability in OX App Suite.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2023-26438?
CVE-2023-26438 is a medium-severity server-side request forgery vulnerability in OX App Suite, published on 2 Aug 2023. Any signed-in user can exploit it over the network, with no action from the victim.
Official 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.
Which versions are affected by CVE-2023-26438?
It affects 1 product.
Products include Open-Xchange Open-Xchange Appsuite Backend.
How do I fix CVE-2023-26438?
No fix has been published for CVE-2023-26438 yet. Limit exposure of the affected software until one is available.
Upgrade, and send outbound requests through an allow-list that blocks internal addresses. More about Server-side request forgery.
Is CVE-2023-26438 being exploited?
There is no known exploitation of CVE-2023-26438 in the wild and no public exploit code.
Other vulnerabilities in OX App Suite
Sources
Also known as GHSA-cp3q-q6mx-w79j.