Apache Struts up to 2.5.5 URL Validator input validation

CVSS Meta Temp Score
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CTI Interest Score
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5.4$0-$5k0.00

Summaryinfo

A vulnerability classified as problematic has been found in Apache Struts up to 2.5.5. Affected is an unknown function of the component URL Validator. Performing a manipulation results in input validation. This vulnerability is known as CVE-2016-8738. Remote exploitation of the attack is possible. No exploit is available. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability classified as problematic has been found in Apache Struts up to 2.5.5 (Programming Tool Software). This affects some unknown processing of the component URL Validator. The manipulation with an unknown input leads to a input validation vulnerability. CWE is classifying the issue as 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. This is going to have an impact on availability. The summary by CVE is:

In Apache Struts 2.5 through 2.5.5, if an application allows entering a URL in a form field and the built-in URLValidator is used, it is possible to prepare a special URL which will be used to overload server process when performing validation of the URL.

The bug was discovered 10/18/2016. The weakness was published 09/20/2017 (Website). It is possible to read the advisory at struts.apache.org. This vulnerability is uniquely identified as CVE-2016-8738 since 10/18/2016. The exploitability is told to be easy. 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 vulnerability was handled as a non-public zero-day exploit for at least 36 days. During that time the estimated underground price was around $5k-$25k. The vulnerability scanner Nessus provides a plugin with the ID 95887 (Apache Struts 2.5.x < 2.5.13 URLValidator Form Field Handling Remote DoS (S2-044)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Misc. and running in the context c.

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 databases at Tenable (95887) and SecurityFocus (BID 94657†). Similar entry is available at VDB-106874. Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

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Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.6
VulDB Meta Temp Score: 5.5

VulDB Base Score: 5.3
VulDB Temp Score: 5.1
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 5.9
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: 🔍

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: 95887
Nessus Name: Apache Struts 2.5.x < 2.5.13 URLValidator Form Field Handling Remote DoS (S2-044)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 802422
OpenVAS Name: Apache Struts URLValidator Denial-Of-Service Vulnerability - Oct17 (Windows)
OpenVAS File: 🔍
OpenVAS Family: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Timelineinfo

10/18/2016 🔍
10/18/2016 +0 days 🔍
11/23/2016 +36 days 🔍
12/05/2016 +12 days 🔍
12/15/2016 +10 days 🔍
09/20/2017 +279 days 🔍
09/20/2017 +0 days 🔍
09/20/2017 +0 days 🔍
01/13/2021 +1211 days 🔍

Sourcesinfo

Vendor: apache.org

Advisory: struts.apache.org
Researcher: Jonathan Bullock.
Status: Not defined
Confirmation: 🔍

CVE: CVE-2016-8738 (🔍)
GCVE (CVE): GCVE-0-2016-8738
GCVE (VulDB): GCVE-100-106875
SecurityFocus: 94657 - Apache Struts CVE-2016-8738 Denial of Service Vulnerability

See also: 🔍

Entryinfo

Created: 09/20/2017 23:17
Updated: 01/13/2021 14:22
Changes: 09/20/2017 23:17 (71), 11/18/2019 07:29 (6), 01/13/2021 14:22 (3)
Complete: 🔍
Cache ID: 216::103

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

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