SB2017030102 - Two vulnerabilities in TYPO3 CMS

Description

This security bulletin contains information about 2 secuirty vulnerabilities.

1) Authentication bypass (CVE-ID: N/A)

The vulnerability allows a remote attacker to bypass authentication process.

The vulnerability exists in TYPO3 CMS due to late TCA initialization when authenticating users. A remote attacker with disabled account can bypass authentication process and successfully login to the web application.

Successful exploitation of the vulnerability may allow an attacker with deactivated / disabled accounts to bypass authentication process and login to the website.

2) Cross-site scripting (CVE-ID: N/A)

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. 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.

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.

Remediation

Install update from vendor's website.

References

• https://typo3.org/teams/security/security-bulletins/typo3-core/typo3-core-sa-2017-002/
• https://typo3.org/teams/security/security-bulletins/typo3-core/typo3-core-sa-2017-003/