HTTP/2 Data Buffer resource consumption

CVSS Meta Temp Score
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CTI Interest Score
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6.7$0-$5k0.00

Summaryinfo

A vulnerability categorized as critical has been discovered in HTTP2. Affected by this vulnerability is an unknown functionality of the component Data Buffer Handler. Executing a manipulation can lead to resource consumption. This vulnerability appears as CVE-2019-9517. The attack may be performed from remote. There is no available exploit. This vulnerability has a historic impact due to its background and reception. The application of restrictive firewalling is recommended.

Detailsinfo

A vulnerability has been found in HTTP2 (affected version unknown) and classified as critical. This vulnerability affects an unknown functionality of the component Data Buffer Handler. The manipulation with an unknown input leads to a resource consumption vulnerability. The CWE definition for the vulnerability is CWE-400. The product does not properly control the allocation and maintenance of a limited resource, thereby enabling an actor to influence the amount of resources consumed, eventually leading to the exhaustion of available resources. As an impact it is known to affect availability. CVE summarizes:

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 weakness was presented 08/13/2019 as confirmed advisory (CERT.org). The advisory is shared for download at kb.cert.org. This vulnerability was named CVE-2019-9517 since 03/01/2019. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. There are neither technical details nor an exploit publicly available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 01/15/2025). The MITRE ATT&CK project declares the attack technique as T1499. This vulnerability has a historic impact due to its background and reception.

The vulnerability scanner Nessus provides a plugin with the ID 210268 (RHEL 6 / 7 : httpd24-httpd and httpd24-nghttp2 (RHSA-2019:2949)), which helps to determine the existence of the flaw in a target environment.

Proper firewalling of is able to address this issue.

The vulnerability is also documented in the vulnerability database at Tenable (210268). See VDB-139968, VDB-139969, VDB-139970 and VDB-139971 for similar entries. VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

Name

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.8
VulDB Meta Temp Score: 6.7

VulDB Base Score: 5.3
VulDB Temp Score: 5.2
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 7.5
NVD Vector: 🔍

CNA Base Score: 7.5
CNA Vector (CERT/CC): 🔍

CVSSv2info

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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Resource consumption
CWE: CWE-400 / CWE-404
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 210268
Nessus Name: RHEL 6 / 7 : httpd24-httpd and httpd24-nghttp2 (RHSA-2019:2949)

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Firewall
Status: 🔍

0-Day Time: 🔍

Timelineinfo

03/01/2019 🔍
08/13/2019 +165 days 🔍
08/15/2019 +2 days 🔍
01/15/2025 +1980 days 🔍

Sourcesinfo

Advisory: RHSA-2019:2893
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2019-9517 (🔍)
GCVE (CVE): GCVE-0-2019-9517
GCVE (VulDB): GCVE-100-140008
See also: 🔍

Entryinfo

Created: 08/15/2019 07:27
Updated: 01/15/2025 05:57
Changes: 08/15/2019 07:27 (57), 07/27/2020 18:31 (1), 11/25/2023 08:53 (4), 11/25/2023 08:56 (12), 11/10/2024 08:57 (17), 01/15/2025 05:57 (1)
Complete: 🔍
Cache ID: 216::103

VulDB is the best source for vulnerability data and more expert information about this specific topic.

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