CVE-2024-39920
The TCP protocol in RFC 9293 has a timing side channel that makes it easier for remote attackers to infer the content of one TCP connection from a client system (to any server), when that client system is concurrently obtaining TCP data at a slow rate…
Does this matter?
Lower severity and a low EPSS score (0.57%). Track it; it rarely justifies an emergency change on its own.
Description
The TCP protocol in RFC 9293 has a timing side channel that makes it easier for remote attackers to infer the content of one TCP connection from a client system (to any server), when that client system is concurrently obtaining TCP data at a slow rate from an attacker-controlled server, aka the "SnailLoad" issue. For example, the attack can begin by measuring RTTs via the TCP segments whose role is to provide an ACK control bit and an Acknowledgment Number.
- CVSS 3.1
- 4.3 MEDIUMCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
- EPSS
- 0.57% probability · 46th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-1255
- Source
- cve@mitre.org
References
- https://github.com/IAIK/SnailLoad
- https://news.ycombinator.com/item?id=40809629
- https://twitter.com/tugraz/status/1805272833322299412
- https://www.instagram.com/p/C8wpO1UtExw/
- https://www.rfc-editor.org/rfc/rfc9293.txt
- https://www.snailload.com
- https://www.snailload.com/snailload.pdf
- https://www.tugraz.at/en/tu-graz/services/news-stories/tu-graz-news/singleview/article/neue-sicherheitsluecke-erlaubt-ueberwachung-besuchter-websites-und-angesehener-videos
- https://github.com/IAIK/SnailLoad
- https://news.ycombinator.com/item?id=40809629
- https://twitter.com/tugraz/status/1805272833322299412
- https://www.instagram.com/p/C8wpO1UtExw/
- https://www.rfc-editor.org/rfc/rfc9293.txt
- https://www.snailload.com
- https://www.snailload.com/snailload.pdf
- https://www.tugraz.at/en/tu-graz/services/news-stories/tu-graz-news/singleview/article/neue-sicherheitsluecke-erlaubt-ueberwachung-besuchter-websites-und-angesehener-videos
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.