H2O up to 2.0.3/2.1.0-beta2 fastcgi/mruby/proxy/redirect/reproxy format string

CVSS Meta Temp Score
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CTI Interest Score
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6.3$0-$5k0.00

Summaryinfo

A vulnerability classified as problematic has been found in H2O up to 2.0.3/2.1.0-beta2. Affected by this issue is some unknown functionality of the component fastcgi/mruby/proxy/redirect/reproxy. The manipulation leads to format string. This vulnerability is referenced as CVE-2016-4864. Remote exploitation of the attack is possible. No exploit is available. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as problematic, has been found in H2O up to 2.0.3/2.1.0-beta2. This issue affects some unknown processing of the component fastcgi/mruby/proxy/redirect/reproxy. The manipulation with an unknown input leads to a format string vulnerability. Using CWE to declare the problem leads to CWE-134. The product uses a function that accepts a format string as an argument, but the format string originates from an external source. Impacted is availability. The summary by CVE is:

H2O versions 2.0.3 and earlier and 2.1.0-beta2 and earlier allows remote attackers to cause a denial-of-service (DoS) via format string specifiers in a template file via fastcgi, mruby, proxy, redirect or reproxy.

The bug was discovered 09/15/2016. The weakness was published 05/12/2017 (Website). It is possible to read the advisory at jvn.jp. The identification of this vulnerability is CVE-2016-4864 since 05/17/2016. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. The technical details are unknown and an exploit is not publicly available.

The vulnerability scanner Nessus provides a plugin with the ID 93494 (FreeBSD : h2o -- fix DoS attack vector (08664d42-7989-11e6-b7a8-74d02b9a84d5)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family FreeBSD Local Security Checks and running in the context l.

Upgrading eliminates this vulnerability. A possible mitigation has been published even before and not after the disclosure of the vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (93494). Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

Name

Version

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

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: 5.1
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 7.5
NVD Vector: 🔍

CVSSv2info

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

NVD Base Score: 🔍

Exploitinginfo

Class: Format string
CWE: CWE-134 / CWE-119
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: 93494
Nessus Name: FreeBSD : h2o -- fix DoS attack vector (08664d42-7989-11e6-b7a8-74d02b9a84d5)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 800452
OpenVAS Name: H2O HTTP Server Format String Vulnerability
OpenVAS File: 🔍
OpenVAS Family: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Timelineinfo

05/17/2016 🔍
09/14/2016 +120 days 🔍
09/15/2016 +1 days 🔍
09/15/2016 +0 days 🔍
05/12/2017 +239 days 🔍
05/12/2017 +0 days 🔍
05/13/2017 +1 days 🔍
12/06/2022 +2033 days 🔍

Sourcesinfo

Product: github.com

Advisory: 1077
Status: Not defined
Confirmation: 🔍

CVE: CVE-2016-4864 (🔍)
GCVE (CVE): GCVE-0-2016-4864
GCVE (VulDB): GCVE-100-101135
OSVDB: - CVE-2016-4864 - H2O Project - H2O - Medium

Entryinfo

Created: 05/13/2017 08:54
Updated: 12/06/2022 11:49
Changes: 05/13/2017 08:54 (67), 09/25/2020 18:44 (4), 12/06/2022 11:49 (4)
Complete: 🔍
Cache ID: 216::103

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

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