CVE-2025-24356
- Source
- https://nvd.nist.gov/vuln/detail/CVE-2025-24356
- Import Source
- https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-24356.json
- JSON Data
- https://api.osv.dev/v1/vulns/CVE-2025-24356
- Aliases
-
- GHSA-pggg-vpfv-4rcv
- Related
- Published
- 2025-01-27T18:15:41Z
- Modified
- 2025-02-01T05:47:47.809553Z
- 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
-
- https://github.com/neocturne/fastd/security/advisories/GHSA-pggg-vpfv-4rcv
- https://github.com/neocturne/fastd/commit/1f233bee76b722c0b3f9024f2c39c72e9f7e5843
- https://github.com/neocturne/fastd/commit/3940150e801d0c91460491bec32cbcc5bbc89d5f
- https://github.com/neocturne/fastd/commit/5f63fcfc18ae9cad023fa463b152d5e14192b5a8
- https://github.com/neocturne/fastd/commit/9df7e516378441d2d17b89f9db5c27c8312d8f12
- https://github.com/neocturne/fastd/commit/c1a07b3f2b9066c3713c68547da700b85d60f4f7
- https://github.com/neocturne/fastd/commit/ce1b79b12dbfa796743b5f3a50789ade965b7023
- https://github.com/neocturne/fastd/commit/d03a0a17347efb5293e42fde7d982781e90f14ef
- https://security-tracker.debian.org/tracker/CVE-2025-24356
Affected packages
Debian:11 / fastd
Package
- Name
- fastd
- Purl
- pkg:deb/debian/fastd?arch=source
Debian:12 / fastd
Package
- Name
- fastd
- Purl
- pkg:deb/debian/fastd?arch=source
Debian:13 / fastd
Package
- Name
- fastd
- Purl
- pkg:deb/debian/fastd?arch=source
Git / github.com/neocturne/fastd
Affected ranges
- Type
- GIT
- Repo
- https://github.com/neocturne/fastd
- Events
-
Introduced0 Unknown introduced commit / All previous commits are affectedFixedFixedFixedFixedFixedFixedFixed