CVE-2018-1000172

NextGEN Gallery <= 2.2.44 - Cross-Site Scripting via image alt and title text

2018-02-14 00:00

Strategic Overview

Status: Patched in 2.2.45
Affected Plugin: Photo Gallery, Sliders, Proofing and Themes – NextGEN Gallery
Affected Version: <= 2.2.44
CVSS: 4.8Medium
Weakness type: CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CVE: CVE-2018-1000172

View all Photo Gallery, Sliders, Proofing and Themes – NextGEN Gallery vulnerabilities

At a glance

CVE-2018-1000172 is a medium-severity Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in the Photo Gallery, Sliders, Proofing and Themes WordPress plugin, affecting versions <= 2.2.44. It carries a CVSS score of 4.8 (reachable over the network; low attack complexity). The issue is fixed in version 2.2.45; sites on affected versions should update now. Disclosed February 2018, reported by Zhouyuan Yang.

Vulnerability Overview

Imagely NextGEN Gallery version 2.2.30 and earlier contains a Cross Site Scripting (XSS) vulnerability in Image Alt & Title Text. This attack appears to be exploitable via a victim viewing the image in the administrator page. This vulnerability appears to have been fixed in 2.2.45.

Technical Analysis

The vector marks this flaw as remotely reachable over the network, with low attack complexity — no special timing or configuration is needed.

CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Reaching this weakness in Photo Gallery, Sliders, Proofing and Themes <= 2.2.44 takes a caller who can reach the endpoint. Cross-site scripting happens when input from a request is written into a page without being escaped for the context it lands in, so the browser parses attacker-supplied text as markup or script.

Injected script runs with the privileges of whoever views the affected page, which is how these flaws turn into administrator session theft, silent account creation or persistent backdoors in page content. For Photo Gallery, Sliders, Proofing and Themes the fix is 2.2.45: builds <= 2.2.44 are affected, anything from 2.2.45 onward is not.

Remediation

Update to version 2.2.45, or a newer patched version

How does WordSec protect against this?

The attempt arrives as an ordinary request to Photo Gallery, Sliders, Proofing and Themes: WordSec's web application firewall inspects request payloads before WordPress loads them. None of that substitutes for the fix: Photo Gallery, Sliders, Proofing and Themes 2.2.45 closes this, and updating the plugin is the step that ends it.

Firewall
Alerts

External References

https://www.cve.org/CVERecord?id=CVE-2018-1000172 https://www.wordfence.com/threat-intel/vulnerabilities/id/674f75d7-83de-4d0b-80f2-ee83dd474728 https://nvd.nist.gov/vuln/detail/CVE-2018-1000172

Related records

Same weakness class

Other vulnerabilities in Photo Gallery, Sliders, Proofing and Themes – NextGEN Gallery

CVSS Vector

4.8

CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N

Base

Attack VectorNetwork
Attack ComplexityLow
Privileges RequiredHigh
User InteractionRequired
ScopeChanged
ConfidentialityLow
IntegrityLow
AvailabilityNone

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