CVE-2023-26432 Denial of service in OX App Suite
An attacker with a rogue SMTP service can cause denial of service in OX App Suite by sending excessively large SMTP capability responses.
- 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-2023-26432?
CVE-2023-26432 is a medium-severity denial of service vulnerability in OX App Suite, published on 20 Jun 2023. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
When adding an external mail account, processing of SMTP "capabilities" responses are not limited to plausible sizes. Attacker with access to a rogue SMTP service could trigger requests that lead to excessive resource usage and eventually service unavailability. We now limit accepted SMTP server response to reasonable length/size. No publicly available exploits are known.
Weakness: CWE-400
Which versions are affected by CVE-2023-26432?
It affects 1 product.
Products include Open-Xchange Open-Xchange Appsuite Backend.
How do I fix CVE-2023-26432?
No fix has been published for CVE-2023-26432 yet. Limit exposure of the affected software until one is available.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2023-26432 being exploited?
There is no known exploitation of CVE-2023-26432 in the wild and no public exploit code.
Other vulnerabilities in OX App Suite
Sources
Also known as GHSA-9628-xx9p-xjqj.