CVE-2017-15891 Missing authorization in Synology Calendar

Medium 6.5 Published 8 Dec 2017 Updated 16 Sep 2024

Remote authenticated users can modify calendar events due to improper access control in Synology Calendar.

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-2017-15891?

CVE-2017-15891 is a medium-severity missing authorization vulnerability in Synology Calendar, published on 8 Dec 2017. Any signed-in user can exploit it over the network, with no action from the victim.

Official description

Improper access control vulnerability in SYNO.Cal.EventBase in Synology Calendar before 2.0.1-0242 allows remote authenticated users to modify calendar event via unspecified vectors.

Weakness: CWE-284

Which versions are affected by CVE-2017-15891?

It affects 1 product.

Products include Synology Calendar.

How do I fix CVE-2017-15891?

No fix has been published for CVE-2017-15891 yet. Limit exposure of the affected software until one is available.

Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.

Is CVE-2017-15891 being exploited?

There is no known exploitation of CVE-2017-15891 in the wild and no public exploit code.

Sources

Also known as GHSA-9x4q-j758-h4gx.