H2O up to 2.2.3 HTTP/2 Header input validation

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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6.3$0-$5k0.05

A vulnerability classified as problematic was found in H2O up to 2.2.3. This vulnerability affects some unknown processing of the component HTTP2 Header Handler. The manipulation with an unknown input leads to a input validation vulnerability. The CWE definition for the vulnerability is CWE-20. The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly. As an impact it is known to affect availability. CVE summarizes:

H2O version 2.2.3 and earlier allows remote attackers to cause a denial of service in the server via specially crafted HTTP/2 header.

The bug was discovered 12/18/2017. The weakness was presented 12/22/2017 (Website). The advisory is available at jvn.jp. This vulnerability was named CVE-2017-10908 since 07/04/2017. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. The technical details are unknown and an exploit is not available.

The vulnerability was handled as a non-public zero-day exploit for at least 4 days. During that time the estimated underground price was around $0-$5k.

Proper firewalling of is able to address this issue.

See 110994, 110995 and 110996 for similar entries.

Productinfo

Name

Version

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB CVSS-B Score: 🔍
VulDB CVSS-BT Score: 🔍
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.4
VulDB Meta Temp Score: 6.3

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

NVD Base Score: 7.5
NVD Vector: 🔍

CVSSv2info

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

NVD Base Score: 🔍

Exploitinginfo

Class: Input validation
CWE: CWE-20
CAPEC: 🔍
ATT&CK: 🔍

Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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OpenVAS ID: 864859
OpenVAS Name: H2O HTTP Server Multiple Vulnerabilities
OpenVAS File: 🔍
OpenVAS Family: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Firewall
Status: 🔍

0-Day Time: 🔍

Timelineinfo

07/04/2017 🔍
12/18/2017 +167 days 🔍
12/22/2017 +4 days 🔍
12/22/2017 +0 days 🔍
12/23/2017 +1 days 🔍
01/18/2023 +1852 days 🔍

Sourcesinfo

Advisory: 1544
Status: Not defined
Confirmation: 🔍

CVE: CVE-2017-10908 (🔍)
See also: 🔍

Entryinfo

Created: 12/23/2017 09:41
Updated: 01/18/2023 19:12
Changes: 12/23/2017 09:41 (62), 12/17/2019 13:57 (1), 01/18/2023 19:12 (4)
Complete: 🔍

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