Component Type: TYPO3 Core
Affected Versions: 4.5.0 up to 4.5.18, 4.6.0 up to 4.6.11, 4.7.0 up to 4.7.3 and development releases of the 6.0 branch.
Vulnerability Types: Cross-Site Scripting, Information Disclosure, Insecure Unserialize
Overall Severity: Medium
Release Date: August 15, 2012
Vulnerable subcomponent: TYPO3 Backend Help System
Vulnerability Type: Insecure Unserialize leading to a possible Arbitrary Code Execution
Severity: Medium
Suggested CVSS v2.0: AV:N/AC:H/Au:S/C:P/I:C/A:N/E:P/RL:O/RC:C (What's that?)
Problem Description: Due to a missing signature (HMAC) for a parameter in the view_help.php file, an attacker could unserialize arbitrary objects within TYPO3. We are aware of a working exploit, which can lead to arbitrary code execution. A valid backend user login or multiple successful cross site request forgery attacks are required to exploit this vulnerability.
Solution: Update to the TYPO3 version 4.5.19, 4.6.12 or 4.7.4 that fix the problem described!
Credits: Credits go to Felix Wilhelm who discovered and reported the issue.
Vulnerable subcomponent: TYPO3 Backend
Vulnerability Type: Cross-Site Scripting
Severity: Medium
Suggested CVSS v2.0: AV:N/AC:M/Au:S/C:P/I:P/A:N/E:F/RL:O/RC:C (What's that?)
Problem Description: Failing to properly HTML-encode user input in several places, the TYPO3 backend is susceptible to Cross-Site Scripting. A valid backend user is required to exploit these vulnerabilities.
Solution: Update to the TYPO3 version 4.5.19, 4.6.12 or 4.7.4 that fix the problem described!
Credits: Credits go to Pavel Vaysband, Security Team Member Markus Bucher, Core Team Member Susanne Moog, Jan Bednarik, who discovered and reported the issues.
Vulnerable subcomponent: TYPO3 Backend
Vulnerability Type: Information Disclosure
Severity: Low
Suggested CVSS v2.0: AV:N/AC:L/Au:S/C:P/I:N/A:N/E:F/RL:O/RC:C (What's that?)
Problem Description: Accessing the configuration module discloses the Encryption Key. A valid backend user with access to the configuration module is required to exploit this vulnerability.
Solution: Update to the TYPO3 version 4.5.19, 4.6.12 or 4.7.4 that fix the problem described!
Credits: Credits go to Mario Rimann who discovered and reported the issue.
Vulnerable subcomponent: TYPO3 HTML Sanitizing API
Vulnerability Type: Cross-Site Scripting
Severity: Medium
Suggested CVSS v2.0: AV:N/AC:M/Au:N/C:P/I:P/A:N/E:U/RL:O/RC:C (What's that?)
Problem Description: By not removing several HTML5 JavaScript events, the API method t3lib_div::RemoveXSS() fails to filter specially crafted HTML injections, thus is susceptible to Cross-Site Scripting. Failing to properly encode for JavaScript the API method t3lib_div::quoteJSvalue(), it is susceptible to Cross-Site Scripting.
Note: Developers should never rely on the blacklist of RemoveXSS() alone, but should always properly encode user input before outputting it again.
Solution: Update to the TYPO3 version 4.5.19, 4.6.12 or 4.7.4 that fix the problem described!
Credits: Credits go to Andreas Schnapp and Christian Nösterer who discovered and reported the issues.
Vulnerable subcomponent: TYPO3 Install Tool
Vulnerability Type: Cross-Site Scripting
Severity: Low
Suggested CVSS v2.0: AV:N/AC:H/Au:S/C:P/I:P/A:N/E:F/RL:O/RC:C (What's that?)
Problem Description: Failing to properly sanitize user input, the Install Tool is susceptible to Cross-Site Scripting.
Solution: Update to the TYPO3 version 4.5.19, 4.6.12 or 4.7.4 that fix the problem described!
Credits: Credits go to Security Team Member Georg Ringer who discovered and reported the issue.
General Advice: Follow the recommendations that are given in the TYPO3 Security Guide. Please subscribe to the typo3-announce mailing list.