#VU195 Cross-site scripting in third party library mso/idna-convert in TYPO3

Vulnerability identifier: #VU195

Vulnerability risk: High

CVSSv4.0: 5.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:A/U:Amber]

CVE-ID: N/A

CWE-ID: CWE-79

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
TYPO3
Web applications / CMS

Vendor: TYPO3

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

The vulnerability exists in TYPO3 CMS. TYPO3 ships example code from mso/idna-convert library in the vendor folder, which is vulnerable to Cross-Site Scripting.

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.

Mitigation
Install the latest versions (7.6.10, 8.2.1).

Vulnerable software versions

TYPO3: 7.6-snapshot-20160223 - 7.6.9, 8.0.0 - 8.2.0

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External links
https://typo3.org/teams/security/security-bulletins/typo3-core/typo3-core-sa-2016-020/

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability. However, a fully functional exploit for this vulnerability is available.