Improper privilege management in IBM MQ Appliance

1) Improper Privilege Management

EUVDB-ID: #VU69431

Risk: Low

CVSSv3.1: 3.9 [CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2020-35513

CWE-ID: CWE-269 - Improper Privilege Management

Exploit availability: No

Description

The vulnerability allows a local user to perform a denial of service attack.

The vulnerability exists due to improper privilege management in the Linux kernel NFS (network file system) functionality in the way user create and delete object using NFSv4.2 or newer if both simultaneously accessing the NFS by the other process that is not using new NFSv4.2. A local user can trigger the vulnerability to starve the resources and perform a denial of service attack.

Mitigation

Install update from vendor's website.

Vulnerable software versions

IBM MQ Appliance: 9.2.0.0 - 9.2.5

External links

http://www.ibm.com/blogs/psirt/security-bulletin-ibm-mq-appliance-is-vulnerable-to-a-denial-of-service-due-to-linux-kernel-cve-2020-35513/

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.