UBUNTU-CVE-2025-24356

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Source
https://ubuntu.com/security/CVE-2025-24356
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2025/UBUNTU-CVE-2025-24356.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2025-24356
Related
Published
2025-01-27T18:15:00Z
Modified
2025-01-29T16:32:55Z
Summary
[none]
Details

fastd is a VPN daemon which tunnels IP packets and Ethernet frames over UDP. When receiving a data packet from an unknown IP address/port combination, fastd will assume that one of its connected peers has moved to a new address and initiate a reconnect by sending a handshake packet. This "fast reconnect" avoids having to wait for a session timeout (up to ~90s) until a new connection is established. Even a 1-byte UDP packet just containing the fastd packet type header can trigger a much larger handshake packet (~150 bytes of UDP payload). Including IPv4 and UDP headers, the resulting amplification factor is roughly 12-13. By sending data packets with a spoofed source address to fastd instances reachable on the internet, this amplification of UDP traffic might be used to facilitate a Distributed Denial of Service attack. This vulnerability is fixed in v23.

References

Affected packages

Ubuntu:Pro:16.04:LTS / fastd

Package

Name
fastd
Purl
pkg:deb/ubuntu/fastd@17-4ubuntu0.1?arch=source&distro=esm-apps/xenial

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

Other

17-4
17-4build1

17-4ubuntu0.*

17-4ubuntu0.1

Ecosystem specific 

{
    "ubuntu_priority": "medium"
}

Ubuntu:Pro:18.04:LTS / fastd

Package

Name
fastd
Purl
pkg:deb/ubuntu/fastd@18-3ubuntu0.18.04.1?arch=source&distro=esm-apps/bionic

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

Other

18-2
18-2ubuntu1
18-2ubuntu2
18-3

18-3ubuntu0.*

18-3ubuntu0.18.04.1

Ecosystem specific 

{
    "ubuntu_priority": "medium"
}

Ubuntu:20.04:LTS / fastd

Package

Name
fastd
Purl
pkg:deb/ubuntu/fastd@18-3ubuntu0.1?arch=source&distro=focal

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

Other

18-3build1

18-3ubuntu0.*

18-3ubuntu0.1

Ecosystem specific 

{
    "ubuntu_priority": "medium"
}

Ubuntu:22.04:LTS / fastd

Package

Name
fastd
Purl
pkg:deb/ubuntu/fastd@22-2build1?arch=source&distro=jammy

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

Other

21-1
22-2
22-2build1

Ecosystem specific 

{
    "ubuntu_priority": "medium"
}

Ubuntu:24.10 / fastd

Package

Name
fastd
Purl
pkg:deb/ubuntu/fastd@22-4build2?arch=source&distro=oracular

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

Other

22-4build2

Ecosystem specific 

{
    "ubuntu_priority": "medium"
}

Ubuntu:24.04:LTS / fastd

Package

Name
fastd
Purl
pkg:deb/ubuntu/fastd@22-4build2?arch=source&distro=noble

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

Other

22-4
22-4build1
22-4build2

Ecosystem specific 

{
    "ubuntu_priority": "medium"
}