Denial of service in XACK DNS

1) Resource management error

EUVDB-ID: #VU28748

Risk: High

CVSSv4.0: 6.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber]

CVE-ID: CVE-2020-5591

CWE-ID: CWE-399 - Resource Management Errors

Exploit availability: No

Description

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

The vulnerability exists due to improper management of internal resources with the applicatoin when using the cache server feature. A remote attacker can perform a NXNSAttack and cause a denial of service condition on the target system.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

XACK DNS: - - 1.11.4

CPE2.3

• cpe:2.3:a:xack:xack_dns:*:*:*:*:*:*:*:*
• cpe:2.3:a:xack:xack_dns:1.7.0:*:*:*:*:*:*:*
• cpe:2.3:a:xack:xack_dns:1.7.1:*:*:*:*:*:*:*

External links

https://jvn.jp/en/jp/JVN40208370/index.html
https://www.nxnsattack.com/

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

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