Impact: Important Public Date: 2019-08-13 CWE: CWE-400 Bugzilla: 1741868: CVE-2019-9517 HTTP/2: request for large response leads to denial of service Some HTTP/2 implementations are vulnerable to unconstrained interal data buffering, potentially leading to a denial of service. The attacker opens the HTTP/2 window so the peer can send without constraint; however, they leave the TCP window closed so the peer cannot actually write (many of) the bytes on the wire. The attacker then sends a stream of requests for a large response object. Depending on how the servers queue the responses, this can consume excess memory, CPU, or both.
The MITRE CVE dictionary describes this issue as:
Find out more about CVE-2019-9517 from the MITRE CVE dictionary dictionary and NIST NVD.
NOTE: The following CVSS v3 metrics and score provided are preliminary and subject to review.
| CVSS3 Base Score | 7.5 |
|---|---|
| CVSS3 Base Metrics | CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
| Attack Vector | Network |
| Attack Complexity | Low |
| Privileges Required | None |
| User Interaction | None |
| Scope | Unchanged |
| Confidentiality | None |
| Integrity Impact | None |
| Availability Impact | High |
| Platform | Package | State |
|---|---|---|
| Red Hat JBoss Web Server 3.0 | httpd | Under investigation |
| Red Hat Enterprise Linux 8 | httpd | Under investigation |
| Red Hat Enterprise Linux 7 | httpd | Under investigation |
| Red Hat Enterprise Linux 6 | httpd | Under investigation |
| Red Hat Enterprise Linux 5 | httpd | Under investigation |
Vulmon