#VU43836 Input validation error in Moodle - CVE-2011-4586

Vulnerability identifier: #VU43836

Vulnerability risk: Medium

CVSSv4.0: 2.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2011-4586

CWE-ID: CWE-20

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Moodle
Web applications / Other software

Vendor: moodle.org

Description

The vulnerability allows a remote non-authenticated attacker to manipulate data.

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

Mitigation
Install update from vendor's website.

Vulnerable software versions

Moodle: 1.9 - 1.9.14, 2.0 - 2.0.5, 2.1 - 2.1.2

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External links
https://git.moodle.org/gw?p=moodle.git;a=commit;h=581e8dba387f090d89382115fd850d8b44351526
https://moodle.org/mod/forum/discuss.php?d=191754
https://www.debian.org/security/2012/dsa-2421
https://bugzilla.redhat.com/show_bug.cgi?id=761248

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.