CVE-2019-9515
HIGH severity · CVSS 7.5 · Uncontrolled resource consumption
7.5CVSS HIGH
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.
Impact & exploitability
Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
Confidentiality impactNone
Integrity impactNone
Availability impactHigh
Exploit probability (EPSS)88%
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Affected products we track (1)
Recommendation
Apply the vendor fix promptly. Open any affected product above for its exact safe version.
Additional information
- NVD record
- http://lists.opensuse.org/opensuse-security-announce/2019-09/msg00031.htmlAdvisory
- http://lists.opensuse.org/opensuse-security-announce/2019-09/msg00032.htmlAdvisory
- http://seclists.org/fulldisclosure/2019/Aug/16Advisory
- https://access.redhat.com/errata/RHSA-2019:2766Advisory
- https://access.redhat.com/errata/RHSA-2019:2796Advisory
- https://access.redhat.com/errata/RHSA-2019:2861Advisory
- https://access.redhat.com/errata/RHSA-2019:2925Advisory
- https://access.redhat.com/errata/RHSA-2019:2939Advisory