CVE-2023-26435 Server-side request forgery in OX App Suite

Medium 5.0 Published 20 Jun 2023 Updated 2 Aug 2024

Attackers can use manipulated ODT documents to access local files and internal network services via LibreOffice integration 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-2023-26435?

CVE-2023-26435 is a medium-severity server-side request forgery 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

It was possible to call filesystem and network references using the local LibreOffice instance using manipulated ODT documents. Attackers could discover restricted network topology and services as well as including local files with read permissions of the open-xchange system user. This was limited to specific file-types, like images. We have improved existing content filters and validators to avoid including any local resources. No publicly available exploits are known.

Weakness: CWE-918

Which versions are affected by CVE-2023-26435?

It affects 1 product.

Products include Open-Xchange Open-Xchange Appsuite Backend.

How do I fix CVE-2023-26435?

No fix has been published for CVE-2023-26435 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-2023-26435 being exploited?

There is no known exploitation of CVE-2023-26435 in the wild and no public exploit code.

Sources

Also known as GHSA-qg93-cpf3-386g.