OpenAFS CVE-2019-18601 Denial of Service Vulnerability

Description

OpenAFS is prone to a denial-of-service vulnerability. A remote attacker may exploit this issue to cause a denial-of-service condition; denying service to legitimate users. OpenAFS 1.0 through 1.6.23 and 1.8.0 through 1.8.4 are vulnerable.

Technologies Affected

• OpenAFS Openafs 1.0.0
• OpenAFS Openafs 1.0.1
• OpenAFS Openafs 1.0.2
• OpenAFS Openafs 1.0.3
• OpenAFS Openafs 1.0.4
• OpenAFS Openafs 1.0.4 A
• OpenAFS Openafs 1.1.0
• OpenAFS Openafs 1.1.1
• OpenAFS Openafs 1.1.1 A
• OpenAFS Openafs 1.2.0
• OpenAFS Openafs 1.2.1
• OpenAFS Openafs 1.2.2
• OpenAFS Openafs 1.2.2 A
• OpenAFS Openafs 1.2.2 B
• OpenAFS Openafs 1.2.3
• OpenAFS Openafs 1.2.4
• OpenAFS Openafs 1.2.5
• OpenAFS Openafs 1.2.6
• OpenAFS Openafs 1.2.7
• OpenAFS Openafs 1.2.8
• OpenAFS Openafs 1.2.9
• OpenAFS Openafs 1.3.0
• OpenAFS Openafs 1.3.1
• OpenAFS Openafs 1.3.2
• OpenAFS Openafs 1.3.50
• OpenAFS Openafs 1.3.64
• OpenAFS Openafs 1.3.81
• OpenAFS Openafs 1.4.0
• OpenAFS Openafs 1.4.1
• OpenAFS Openafs 1.4.10
• OpenAFS Openafs 1.4.11
• OpenAFS Openafs 1.4.12
• OpenAFS Openafs 1.4.13
• OpenAFS Openafs 1.4.14
• OpenAFS Openafs 1.4.14.1
• OpenAFS Openafs 1.4.15
• OpenAFS Openafs 1.4.2
• OpenAFS Openafs 1.4.3
• OpenAFS Openafs 1.4.4
• OpenAFS Openafs 1.4.5
• OpenAFS Openafs 1.4.6
• OpenAFS Openafs 1.4.8
• OpenAFS Openafs 1.4.9
• OpenAFS Openafs 1.5.0
• OpenAFS Openafs 1.5.1
• OpenAFS Openafs 1.5.10
• OpenAFS Openafs 1.5.11
• OpenAFS Openafs 1.5.12
• OpenAFS Openafs 1.5.13
• OpenAFS Openafs 1.5.14
• OpenAFS Openafs 1.5.15
• OpenAFS Openafs 1.5.16
• OpenAFS Openafs 1.5.17
• OpenAFS Openafs 1.5.18
• OpenAFS Openafs 1.5.19
• OpenAFS Openafs 1.5.2
• OpenAFS Openafs 1.5.27
• OpenAFS Openafs 1.5.28
• OpenAFS Openafs 1.5.3
• OpenAFS Openafs 1.5.4
• OpenAFS Openafs 1.5.5
• OpenAFS Openafs 1.5.58
• OpenAFS Openafs 1.5.6
• OpenAFS Openafs 1.5.7
• OpenAFS Openafs 1.5.75
• OpenAFS Openafs 1.5.76
• OpenAFS Openafs 1.5.77
• OpenAFS Openafs 1.5.78
• OpenAFS Openafs 1.5.8
• OpenAFS Openafs 1.5.9
• OpenAFS Openafs 1.6.0
• OpenAFS Openafs 1.6.1
• OpenAFS Openafs 1.6.10
• OpenAFS Openafs 1.6.11
• OpenAFS Openafs 1.6.12
• OpenAFS Openafs 1.6.13
• OpenAFS Openafs 1.6.14
• OpenAFS Openafs 1.6.15
• OpenAFS Openafs 1.6.17
• OpenAFS Openafs 1.6.18
• OpenAFS Openafs 1.6.19
• OpenAFS Openafs 1.6.2
• OpenAFS Openafs 1.6.2.1
• OpenAFS Openafs 1.6.20
• OpenAFS Openafs 1.6.21
• OpenAFS Openafs 1.6.22
• OpenAFS Openafs 1.6.22.4
• OpenAFS Openafs 1.6.23
• OpenAFS Openafs 1.8.0
• OpenAFS Openafs 1.8.1
• OpenAFS Openafs 1.8.1.1
• OpenAFS Openafs 1.8.2
• OpenAFS Openafs 1.8.4

Recommendations

Block external access at the network boundary, unless external parties require service.
If global access isn’t needed, filter access to the affected computer at the network boundary. Restricting access to only trusted computers and networks might greatly reduce the likelihood of successful exploits.

Run all software as a nonprivileged user with minimal access rights.
To limit the potential damage that a successful exploit may achieve, run all nonadministrative software as a regular user with the least amount of privileges required to successfully operate.

Deploy network intrusion detection systems to monitor network traffic for malicious activity.
Deploy NIDS to monitor network traffic for signs of anomalous or suspicious activity including unexplained incoming and outgoing traffic. This may indicate exploit attempts or activity that results from successful exploits.

Updates are available. Please see the references or vendor advisory for more information.