Denial of service in ClusterLabs fence-agents

1) Input validation error

EUVDB-ID: #VU19270

Risk: Low

CVSSv3.1: 4.8 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2019-10153

CWE-ID: CWE-20 - Improper input validation

Exploit availability: No

Description

The vulnerability allows a remote authenticated attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to insufficient validation of user-supplied input when processing non-ASCII characters in guest comments field. A remote attacker can append specially crafted comments to the VM and trigger denial of service condition.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Fence Agents: 3.1.0 - 4.3.3

External links

http://github.com/ClusterLabs/fence-agents/pull/272
http://github.com/ClusterLabs/fence-agents/pull/255

Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.