UBUNTU-CVE-2025-30193

In some circumstances, when DNSdist is configured to allow an unlimited number of queries on a single, incoming TCP connection from a client, an attacker can cause a denial of service by crafting a TCP exchange that triggers an exhaustion of the stack and a crash of DNSdist, causing a denial of service. The remedy is: upgrade to the patched 1.9.10 version. A workaround is to restrict the maximum number of queries on incoming TCP connections to a safe value, like 50, via the setMaxTCPQueriesPerConnection setting. We would like to thank Renaud Allard for bringing this issue to our attention.

References

Affected packages

Ubuntu:Pro:22.04:LTS / dnsdist

Package

Name: dnsdist
Purl: pkg:deb/ubuntu/dnsdist@1.6.1-1ubuntu0.1~esm2?arch=source&distro=esm-apps/jammy

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Fixed

1.6.1-1ubuntu0.1~esm2

Affected versions

1.*

1.5.1-3build2

1.6.1-1build1

1.6.1-1ubuntu0.1~esm1

Ecosystem specific

{
    "availability": "Available with Ubuntu Pro: https://ubuntu.com/pro",
    "binaries": [
        {
            "binary_name": "dnsdist",
            "binary_version": "1.6.1-1ubuntu0.1~esm2"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2025/UBUNTU-CVE-2025-30193.json"

Ubuntu:Pro:24.04:LTS / dnsdist

Package

Name: dnsdist
Purl: pkg:deb/ubuntu/dnsdist@1.8.3-2ubuntu0.1~esm1?arch=source&distro=esm-apps/noble

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Fixed

1.8.3-2ubuntu0.1~esm1

Affected versions

1.*

1.8.0-1

1.8.2-1

1.8.2-2

1.8.2-3

1.8.3-1

1.8.3-2

1.8.3-2build1

1.8.3-2build2

Ecosystem specific

{
    "availability": "Available with Ubuntu Pro: https://ubuntu.com/pro",
    "binaries": [
        {
            "binary_name": "dnsdist",
            "binary_version": "1.8.3-2ubuntu0.1~esm1"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2025/UBUNTU-CVE-2025-30193.json"