Vulnerability identifier: #VU49843

Vulnerability risk: Low

CVSSv3.1: 3.6 [CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:L/A:N/E:P/RL:O/RC:C]

CVE-ID: CVE-2020-25684

CWE-ID: CWE-345

Exploitation vector: Network

Exploit availability: Yes

Vulnerable software:
Dnsmasq
Server applications / DNS servers

Vendor:

Description

The vulnerability allows a remote attacker to compromise the target system.

The vulnerability exists due to a lack of proper address/port check within the "reply_query" function. A remote attacker can perform a DNS cache poisoning attack.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

---

External links
http://ics-cert.us-cert.gov/advisories/icsa-21-019-01
http://www.jsof-tech.com/disclosures/dnspooq/

---

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. However, proof of concept for this vulnerability is available.