CVE-2021-32739 Information disclosure in icinga2
Authenticated API users can read sensitive ticket salts to forge certificates and steal privileged identities in Icinga.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2021-32739?
CVE-2021-32739 is a high-severity vulnerability in Debian Debian Linux, published on 15 Jul 2021. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
Icinga is a monitoring system which checks the availability of network resources, notifies users of outages, and generates performance data for reporting. From version 2.4.0 through version 2.12.4, a vulnerability exists that may allow privilege escalation for authenticated API users. With a read-ony user's credentials, an attacker can view most attributes of all config objects including `ticket_salt` of `ApiListener`. This salt is enough to compute a ticket for every possible common name (CN). A ticket, the master node's certificate, and a self-signed certificate are enough to successfully request the desired certificate from Icinga. That certificate may in turn be used to steal an endpoint or API user's identity. Versions 2.12.5 and 2.11.10 both contain a fix the vulnerability. As a workaround, one may either specify queryable types explicitly or filter out ApiListener objects.
Which versions are affected by CVE-2021-32739?
It affects 2 products.
Products include Debian Debian Linux, Icinga Icinga.
How do I fix CVE-2021-32739?
Upgrade to a fixed version.
Is CVE-2021-32739 being exploited?
There is no known exploitation of CVE-2021-32739 in the wild and no public exploit code.
Other vulnerabilities in Debian Debian Linux
Sources
Also known as DEBIAN-CVE-2021-32739, GHSA-98wp-jc6q-x5q5, UBUNTU-CVE-2021-32739.