CVE-2011-3856

Elegant Grunge <= 1.0.3 - Cross-Site Scripting

2011-09-29 00:00

Strategic Overview

Status: Patched in 1.0.4
Affected Theme: Elegant Grunge
Affected Version: <= 1.0.3
CVSS: 6.1Medium
Weakness type: CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CVE: CVE-2011-3856

At a glance

CVE-2011-3856 is a medium-severity Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in the Elegant Grunge WordPress theme, affecting versions <= 1.0.3. It carries a CVSS score of 6.1 (reachable over the network; low attack complexity). Exploitation requires no authentication. The issue is fixed in version 1.0.4; sites on affected versions should update now. Disclosed September 2011, reported by SiteWatch.

Vulnerability Overview

Cross-site scripting (XSS) vulnerability in the Elegant Grunge theme before 1.0.4 for WordPress allows remote attackers to inject arbitrary web script or HTML via the s parameter.

Technical Analysis

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

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

Reaching this weakness in Elegant Grunge <= 1.0.3 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 Elegant Grunge the fix is 1.0.4: builds <= 1.0.3 are affected, anything from 1.0.4 onward is not.

Remediation

Update to version 1.0.4, or a newer patched version

How does WordSec protect against this?

The attempt arrives as an ordinary request to Elegant Grunge: WordSec's web application firewall inspects request payloads before WordPress loads them. None of that substitutes for the fix: Elegant Grunge 1.0.4 closes this, and updating the theme is the step that ends it.

Firewall
Alerts

External References

https://www.cve.org/CVERecord?id=CVE-2011-3856 https://www.wordfence.com/threat-intel/vulnerabilities/id/94dd90ef-d801-4fd6-ade7-e1e7ad2e5fec https://nvd.nist.gov/vuln/detail/CVE-2011-3856

CVSS Vector

6.1

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

Base

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

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