SB2021120327 - Multiple vulnerabilities in Crafter CMS

Description

This security bulletin contains information about 3 secuirty vulnerabilities.

1) Improper Control of Dynamically-Managed Code Resources (CVE-ID: CVE-2021-23258)

The vulnerability allows a remote user to execute arbitrary commands on the target system.

The vulnerability exists due to no security restrictions for SPEL Expression. A remote administrator can pass specially crafted data to the application and execute arbitrary commands on the target system.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

2) Stored cross-site scripting (CVE-ID: CVE-2021-23260)

The disclosed vulnerability allows a remote attacker to perform cross-site scripting (XSS) attacks.

The vulnerability exists due to insufficient sanitization of user-supplied data in File Name of the File Upload function. A remote authenticated attacker can inject and execute arbitrary HTML and script code in user's browser in context of vulnerable website.

Successful exploitation of this vulnerability may allow a remote attacker to steal potentially sensitive information, change appearance of the web page, perform phishing and drive-by-download attacks.

3) Improper Control of Dynamically-Managed Code Resources (CVE-ID: CVE-2021-23259)

The vulnerability allows a remote user to execute arbitrary shell commands on the target system.

The vulnerability exists due to no security restrictions for groovy script. A remote administrator can pass specially crafted data to the application and execute arbitrary OS commands on the target system.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

Remediation

Install update from vendor's website.

References

• https://docs.craftercms.org/en/3.1/security/advisory.html#cv-2021120101
• https://docs.craftercms.org/en/3.1/security/advisory.html#cv-2021120103
• https://docs.craftercms.org/en/3.1/security/advisory.html#cv-2021120102