Detections
Analytics
FreeBSD : h2o -- multiple HTTP/2 vulnerabilities (73b1e734-c74e-11e9-8052-0028f8d09152) (Ping Flood) (Reset Flood) (Settings Flood)
high Nessus Plugin ID 128136
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Synopsis
The remote FreeBSD host is missing a security-related update.Description
Jonathon Loomey of Netflix reports :HTTP/2 implementations do not robustly handle abnormal traffic and resource exhaustion
Recently, a series of DoS attack vulnerabilities have been reported on a broad range of HTTP/2 stacks. Among the vulnerabilities, H2O is exposed to the following :
- CVE-2019-9512 'Ping Flood': The attacker sends continual pings to an HTTP/2 peer, causing the peer to build an internal queue of responses.
Depending on how efficiently this data is queued, this can consume excess CPU, memory, or both, potentially leading to a denial of service.
- CVE-2019-9514 'Reset Flood': The attacker opens a number of streams and sends an invalid request over each stream that should solicit a stream of RST_STREAM frames from the peer. Depending on how the peer queues the RST_STREAM frames, this can consume excess memory, CPU, or both, potentially leading to a denial of service.
- CVE-2019-9515 'Settings Flood': 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, potentially leading to a denial of service.
Solution
Update the affected package.See Also
https://github.com/h2o/h2o/issues/2090
Plugin Details
Severity: High
ID: 128136
File Name: freebsd_pkg_73b1e734c74e11e980520028f8d09152.nasl
Version: 1.5
Type: local
Family: FreeBSD Local Security Checks
Published: 8/26/2019
Updated: 5/1/2024
Supported Sensors: Nessus
Risk Information
VPR
Risk Factor: Medium
Score: 4.4
CVSS v2
Risk Factor: High
Base Score: 7.8
Temporal Score: 5.8
Vector: CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:C
CVSS Score Source: CVE-2019-9515
CVSS v3
Risk Factor: High
Base Score: 7.5
Temporal Score: 6.5
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C
Vulnerability Information
CPE: p-cpe:/a:freebsd:freebsd:h2o, cpe:/o:freebsd:freebsd
Required KB Items: Host/local_checks_enabled, Host/FreeBSD/release, Host/FreeBSD/pkg_info
Exploit Ease: No known exploits are available
Patch Publication Date: 8/25/2019
Vulnerability Publication Date: 8/13/2019