WordPress up to 4.8.3 Thumbnail input validation

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
7.4$0-$5k0.00

Summaryinfo

A vulnerability marked as critical has been reported in WordPress. Impacted is an unknown function of the component Thumbnail Handler. Performing a manipulation results in input validation. This vulnerability is known as CVE-2017-1000600. Remote exploitation of the attack is possible. No exploit is available. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as critical, was found in WordPress (Content Management System). This affects an unknown code of the component Thumbnail Handler. 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 confidentiality, integrity, and availability. The summary by CVE is:

WordPress version <4.9 contains a CWE-20 Input Validation vulnerability in thumbnail processing that can result in remote code execution. This attack appears to be exploitable via thumbnail upload by an authenticated user and may require additional plugins in order to be exploited however this has not been confirmed at this time. This issue appears to have been partially, but not completely fixed in WordPress 4.9

The bug was discovered 08/20/2018. The weakness was published 09/06/2018 by Sam Thomas (arma) (Website). The advisory is shared at securityfocus.com. This vulnerability is uniquely identified as CVE-2017-1000600 since 09/06/2018. The exploitability is told to be easy. It is possible to initiate the attack remotely. A authentication is needed for exploitation. Neither technical details nor an exploit are publicly available.

The vulnerability was handled as a non-public zero-day exploit for at least 17 days. During that time the estimated underground price was around $5k-$25k. The vulnerability scanner Nessus provides a plugin with the ID 254353 (Linux Distros Unpatched Vulnerability : CVE-2017-1000600), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 4.9 eliminates this vulnerability.

The vulnerability is also documented in the databases at Tenable (254353) and SecurityFocus (BID 105305†). If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

Type

Name

Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.6
VulDB Meta Temp Score: 7.4

VulDB Base Score: 6.3
VulDB Temp Score: 6.0
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 8.8
NVD Vector: 🔍

CVSSv2info

AVACAuCIA
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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: 254353
Nessus Name: Linux Distros Unpatched Vulnerability : CVE-2017-1000600

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: WordPress 4.9

Timelineinfo

08/20/2018 🔍
08/20/2018 +0 days 🔍
09/06/2018 +16 days 🔍
09/06/2018 +0 days 🔍
09/06/2018 +0 days 🔍
09/06/2018 +0 days 🔍
08/25/2025 +2545 days 🔍

Sourcesinfo

Product: wordpress.com

Advisory: securityfocus.com⛔
Researcher: Sam Thomas (arma)
Status: Confirmed

CVE: CVE-2017-1000600 (🔍)
GCVE (CVE): GCVE-0-2017-1000600
GCVE (VulDB): GCVE-100-123645
SecurityFocus: 105305 - WordPress CVE-2017-1000600 Arbitrary File Upload Vulnerability

Entryinfo

Created: 09/06/2018 20:47
Updated: 08/25/2025 20:02
Changes: 09/06/2018 20:47 (64), 06/07/2020 20:09 (1), 08/25/2025 20:02 (20)
Complete: 🔍
Cache ID: 216::103

If you want to get the best quality for vulnerability data then you always have to consider VulDB.

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