Some HTTP/2 implementations are vulnerable to a settings flood, potentially leading to a denial of service
CVE-2019-9515

7.5HIGH

Key Information:

Vendor
Apple
Status
Swiftnio
Vendor
CVE Published:
13 August 2019

Summary

Some HTTP/2 implementations are vulnerable to a settings flood, potentially leading to a denial of service. The attacker sends a stream of SETTINGS frames to the peer. Since the RFC requires that the peer reply with one acknowledgement per SETTINGS frame, an empty SETTINGS frame is almost equivalent in behavior to a ping. Depending on how efficiently this data is queued, this can consume excess CPU, memory, or both.

References

https://kb.cert.org/vuls/id/605641/
third-party-advisoryx_refsource_CERT-VN
https://github.com/Netflix/security-bulletins/blob/master...
x_refsource_MISC
https://lists.apache.org/thread.html/bde52309316ae798186d...
mailing-listx_refsource_MLIST

EPSS Score

18% chance of being exploited in the next 30 days.

CVSS V3.1

Score:
7.5
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Thanks to Jonathan Looney of Netflix for reporting this vulnerability.
.