CVE-2023-26431 Server-side request forgery in OX App Suite

Medium 5.0 Published 20 Jun 2023 Updated 2 Aug 2024

Authenticated attackers can bypass deny-lists via IPv4-mapped IPv6 addresses to access restricted network infrastructure and reveal topology.

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-2023-26431?

CVE-2023-26431 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

IPv4-mapped IPv6 addresses did not get recognized as "local" by the code and a connection attempt is made. Attackers with access to user accounts could use this to bypass existing deny-list functionality and trigger requests to restricted network infrastructure to gain insight about topology and running services. We now respect possible IPV4-mapped IPv6 addresses when checking if contained in a deny-list. No publicly available exploits are known.

Weakness: CWE-918

Which versions are affected by CVE-2023-26431?

It affects 1 product.

Products include Open-Xchange Open-Xchange Appsuite Backend.

How do I fix CVE-2023-26431?

No fix has been published for CVE-2023-26431 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-2023-26431 being exploited?

There is no known exploitation of CVE-2023-26431 in the wild and no public exploit code.

Sources

Also known as GHSA-fqgf-87c4-qvqm.