CVE-2019-9518
Publication date 13 August 2019
Last updated 24 July 2024
Ubuntu priority
Some HTTP/2 implementations are vulnerable to a flood of empty frames, potentially leading to a denial of service. The attacker sends a stream of frames with an empty payload and without the end-of-stream flag. These frames can be DATA, HEADERS, CONTINUATION and/or PUSH_PROMISE. The peer spends time processing each frame disproportionate to attack bandwidth. This can consume excess CPU.
From the Ubuntu Security Team
It was discovered that Netty incorrectly implements HTTP/2. An attacker could possibly use this issue to cause a denial of service.
Status
| Package | Ubuntu Release | Status |
|---|---|---|
| netty | 24.04 LTS noble |
Vulnerable
|
| 22.04 LTS jammy |
Vulnerable
|
|
| 20.04 LTS focal |
Vulnerable
|
|
| 18.04 LTS bionic |
Fixed 1:4.1.7-4ubuntu0.1+esm1
|
|
| 16.04 LTS xenial |
Not affected
|
|
| 14.04 LTS trusty |
Not affected
|
|
| trafficserver | 24.04 LTS noble |
Needs evaluation
|
| 22.04 LTS jammy |
Needs evaluation
|
|
| 20.04 LTS focal |
Not affected
|
|
| 18.04 LTS bionic |
Needs evaluation
|
|
| 16.04 LTS xenial |
Needs evaluation
|
|
| 14.04 LTS trusty | Not in release |
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Get Ubuntu ProSeverity score breakdown
| Parameter | Value |
|---|---|
| Base score |
7.5 · High
|
| Attack vector | Network |
| Attack complexity | Low |
| Privileges required | None |
| User interaction | None |
| Scope | Unchanged |
| Confidentiality | None |
| Integrity impact | None |
| Availability impact | High |
| Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
References
Related Ubuntu Security Notices (USN)
- USN-4866-1
- Netty vulnerabilities
- 29 June 2021