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Moodle CRLF Injection Vulnerability in Calendar Component

Moderate severity GitHub Reviewed Published May 13, 2022 to the GitHub Advisory Database • Updated Jan 17, 2024

Package

composer moodle/moodle (Composer)

Affected versions

< 1.9.15
>= 2.0, < 2.0.6
>= 2.1, < 2.1.3

Patched versions

1.9.15
2.0.6
2.1.3

Description

CRLF injection vulnerability in calendar/set.php in the Calendar component in Moodle 1.9.x before 1.9.15, 2.0.x before 2.0.6, 2.1.x before 2.1.3, and 2.2 allows remote attackers to inject arbitrary HTTP headers and conduct HTTP response splitting attacks via vectors involving the url variable.

References

Published by the National Vulnerability Database Dec 22, 2011
Published to the GitHub Advisory Database May 13, 2022
Reviewed Jan 17, 2024
Last updated Jan 17, 2024

Severity

Moderate

EPSS score

Exploit Prediction Scoring System (EPSS)

This score estimates the probability of this vulnerability being exploited within the next 30 days. Data provided by FIRST.
(48th percentile)

Weaknesses

Improper Neutralization of CRLF Sequences ('CRLF Injection')

The product uses CRLF (carriage return line feeds) as a special element, e.g. to separate lines or records, but it does not neutralize or incorrectly neutralizes CRLF sequences from inputs. Learn more on MITRE.

Improper Neutralization of CRLF Sequences in HTTP Headers ('HTTP Request/Response Splitting')

The product receives data from an HTTP agent/component (e.g., web server, proxy, browser, etc.), but it does not neutralize or incorrectly neutralizes CR and LF characters before the data is included in outgoing HTTP headers. Learn more on MITRE.

CVE ID

CVE-2011-4203

GHSA ID

GHSA-4w8m-96v9-2c86

Source code

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