CVE-2022-24756 Missing Release of Memory after Effective Lifetime in Bareos Director
An attacker can cause a denial of service in Bareos Director by flooding failed PAM authentication attempts, leading to memory exhaustion.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2022-24756?
CVE-2022-24756 is a high-severity denial of service vulnerability in bareos, published on 15 Mar 2022. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Bareos is open source software for backup, archiving, and recovery of data for operating systems. When Bareos Director >= 18.2 but prior to 21.1.0, 20.0.6, and 19.2.12 is built and configured for PAM authentication, a failed PAM authentication will leak a small amount of memory. An attacker that is able to use the PAM Console (i.e. by knowing the shared secret or via the WebUI) can flood the Director with failing login attempts which will eventually lead to an out-of-memory condition in which the Director will not work anymore. Bareos Director versions 21.1.0, 20.0.6 and 19.2.12 contain a Bugfix for this problem. Users who are unable to upgrade may disable PAM authentication as a workaround.
Weakness: CWE-401
Which versions are affected by CVE-2022-24756?
It affects 1 product.
Products include Bareos Bareos.
How do I fix CVE-2022-24756?
No fix has been published for CVE-2022-24756 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-2022-24756 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2022-24756 exists.
Other vulnerabilities in bareos
Sources
Also known as GHSA-jh55-4wgw-xc9j, UBUNTU-CVE-2022-24756.