Moodle Link returnurl cross site scripting

Summaryinfo

A vulnerability has been found in Moodle and classified as problematic. This affects an unknown function of the component Link Handler. Performing a manipulation of the argument returnurl results in cross site scripting. This vulnerability is reported as CVE-2023-23921. The attack is possible to be carried out remotely. No exploit exists. To fix this issue, it is recommended to deploy a patch.

Detailsinfo

A vulnerability classified as problematic has been found in Moodle (Learning Management Software) (the affected version unknown). This affects an unknown part of the component Link Handler. The manipulation of the argument returnurl with an unknown input leads to a cross site scripting vulnerability. CWE is classifying the issue as CWE-79. The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. This is going to have an impact on integrity. The summary by CVE is:

The vulnerability was found Moodle which exists due to insufficient sanitization of user-supplied data in some returnurl parameters. A remote attacker can trick the victim to follow a specially crafted link and execute arbitrary HTML and script code in user's browser in context of vulnerable website. This flaw allows a remote attacker to perform cross-site scripting (XSS) attacks.

The weakness was disclosed 02/18/2023. It is possible to read the advisory at git.moodle.org. This vulnerability is uniquely identified as CVE-2023-23921 since 01/19/2023. It demands that the victim is doing some kind of user interaction. Technical details of the vulnerability are known, but there is no available exploit. The attack technique deployed by this issue is T1059.007 according to MITRE ATT&CK.

Applying a patch is able to eliminate this problem. The bugfix is ready for download at git.moodle.org.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2023-0673). Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Type

• Learning Management Software

Name

• Moodle

License

• open-source

Website

• Product: https://moodle.org/

CPE 2.3info

• 🔍
• 🔍

CPE 2.2info

• 🔍
• 🔍

CVSSv4info

CVSSv3info

CVSSv2info

Exploitinginfo

Threat Intelligenceinfo

Countermeasuresinfo

Timelineinfo

Sourcesinfo

Entryinfo

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Discussion