6.1

CVSS Score

3.0

-

CVSS Score

Basic Information

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CVE-2017-2645

CVE-2017-2645: Moodle XSS in attachments to evidence of prior learning

In Moodle 3.x, XSS can occur via attachments to evidence of prior learning.

(GitHub Advisory)

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CVE-2017-2645

CVE-2017-2645:

6.1

CVSS Score

3.0

-

CVSS Score

Basic Information

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Technical Details

Package Name	Ecosystem	Vulnerable Versions	First Patched Version
moodle/moodle	composer	>= 3.1, < 3.1.5	3.1.5
moodle/moodle	composer	>= 3.2, < 3.2.2	3.2.2

Technical Details

Vulnerability Intelligence
Miggo AI

Root Cause Analysis

The vulnerability stems from improper handling of file downloads in Moodle's file serving mechanism. The advisory explicitly states XSS occurred because attachments were opened in the current Moodle session instead of being forced to download. The send_stored_file function in Moodle's core file handling library (lib/filelib.php) is responsible for sending files with headers. The lack of forced download headers (Content-Disposition: attachment) for these specific attachments would allow HTML/JS files to execute in the victim's browser. This matches the XSS pattern described in CWE-79 and aligns with the security notice mentioning the fix involved forcing downloads for these attachments.

Vulnerable functions

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WAF Protection Rules

WAF Rule

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Reasoning

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