Denial of service in PowerDNS DNSdist

1) Reachable Assertion

EUVDB-ID: #VU89380

Risk: Medium

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:Green]

CVE-ID: CVE-2024-25581

CWE-ID: CWE-617 - Reachable Assertion

Exploit availability: No

Description

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

The vulnerability exists due to a reachable assertion when incoming DNS over HTTPS support is enabled using the nghttp2 provider, and queries are routed to a tcp-only or DNS over TLS backend. A remote attacker can send a specially crafted request for a zone transfer (AXFR or IXFR) over DNS over HTTPS and perform a denial of service (DoS) attack.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

dnsdist: 1.9.0 - 1.9.3

CPE2.3

• cpe:2.3:a:powerdns_com_b_v:dnsdist:1.9.0:*:*:*:*:*:*:*
• cpe:2.3:a:powerdns_com_b_v:dnsdist:1.9.1:*:*:*:*:*:*:*
• cpe:2.3:a:powerdns_com_b_v:dnsdist:1.9.2:*:*:*:*:*:*:*

External links

https://dnsdist.org/security-advisories/powerdns-advisory-for-dnsdist-2024-03.html

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.