#VU49844 Use of a broken or risky cryptographic algorithm in Dnsmasq - CVE-2020-25685

Vulnerability identifier: #VU49844

Vulnerability risk: Low

CVSSv4.0: 2.9 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:P/U:Clear]

CVE-ID: CVE-2020-25685

CWE-ID: CWE-327

Exploitation vector: Network

Exploit availability: Yes

Vulnerable software:
Dnsmasq
Server applications / DNS servers

Vendor: GNU

Description

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

The vulnerability exists due to a lack of query resource name (RRNAME) checks in the "reply_query" function. A remote attacker can perform a DNS cache poisoning attack.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Dnsmasq: before 2.83

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

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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.