HTTP/2 Header resource consumption

CVSS Meta Temp Score
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CTI Interest Score
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6.4$0-$5k0.00

Summaryinfo

A vulnerability was found in HTTP2. It has been rated as critical. Affected is an unknown function of the component Header Handler. Performing a manipulation results in resource consumption. This vulnerability is reported as CVE-2019-9516. The attack is possible to be carried out remotely. No exploit exists. Due to its background and reception, this vulnerability has an historic impact. It is suggested to use restrictive firewalling.

Detailsinfo

A vulnerability, which was classified as critical, was found in HTTP2 (version unknown). This affects an unknown function of the component Header Handler. The manipulation with an unknown input leads to a resource consumption vulnerability. CWE is classifying the issue as 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. This is going to have an impact on availability. The summary by CVE is:

Some HTTP/2 implementations are vulnerable to a header leak, potentially leading to a denial of service. The attacker sends a stream of headers with a 0-length header name and 0-length header value, optionally Huffman encoded into 1-byte or greater headers. Some implementations allocate memory for these headers and keep the allocation alive until the session dies. This can consume excess memory.

The weakness was disclosed 08/13/2019 as not defined mailinglist post (Bugtraq). It is possible to read the advisory at seclists.org. This vulnerability is uniquely identified as CVE-2019-9516 since 03/01/2019. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. The technical details are unknown and an exploit is not publicly available. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 01/15/2025). The attack technique deployed by this issue is T1499 according to MITRE ATT&CK. Due to its background and reception, this vulnerability has a historic impact.

The vulnerability scanner Nessus provides a plugin with the ID 210459 (RHEL 7 : rh-nginx114-nginx (RHSA-2019:2775)), which helps to determine the existence of the flaw in a target environment.

It is possible to mitigate the weakness by firewalling .

The vulnerability is also documented in the vulnerability database at Tenable (210459). The entries VDB-139968, VDB-139969, VDB-139970 and VDB-139971 are pretty similar. Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

Name

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.4
VulDB Meta Temp Score: 6.4

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

NVD Base Score: 6.5
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: 210459
Nessus Name: RHEL 7 : rh-nginx114-nginx (RHSA-2019:2775)

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-2019:2745
Status: Not defined
Confirmation: 🔍

CVE: CVE-2019-9516 (🔍)
GCVE (CVE): GCVE-0-2019-9516
GCVE (VulDB): GCVE-100-140007
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 18:25 (1), 11/25/2023 08:46 (4), 11/25/2023 08:48 (12), 11/07/2024 09:20 (17), 01/15/2025 05:57 (6)
Complete: 🔍
Cache ID: 216::103

Be aware that VulDB is the high quality source for vulnerability data.

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