Vulnerability identifier: #VU24076

Vulnerability risk: Medium

CVSSv3.1: 6.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: N/A

CWE-ID: CWE-121

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Trust-DNS-Server
Web applications / Modules and components for CMS

Vendor: Benjamin Fry

Description

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

The vulnerability exists due to a boundary error when processing additional records for return of MX or SRV record types from the server. A remote unauthenticated attacker can trigger stack-based buffer overflow and cause a denial of service condition on the target system.

Note: This is only possible when a zone is configured with a null target for MX or SRV records, i.e. ".".

Example affected zone record:

no-service 86400 IN MX 0 .

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Trust-DNS-Server: 0.1.0 - 0.15.0

External links
http://rustsec.org/advisories/RUSTSEC-2020-0001.html
http://github.com/bluejekyll/trust-dns/issues/980

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.