PT-2021-4174 · Typo3 · Typo3

Alexander Kellner + 5 · Published 2021-08-10 · Updated 2024-03-06 · CVE-2021-32768

Positive Technologies (AI Summary)

CVSS v3.1

6.1

Medium

Base vector

AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Name of the Vulnerable Software and Affected Versions TYPO3 versions prior to 7.6.53 ELTS TYPO3 versions prior to 8.7.42 ELTS TYPO3 versions prior to 9.5.29 TYPO3 versions prior to 10.4.19 TYPO3 versions prior to 11.3.2

Description The content rendering process in the website frontend is vulnerable to cross-site scripting due to failing to properly parse, sanitize, and encode malicious rich-text content. Corresponding rendering instructions via TypoScript functionality HTMLparser do not consider all potentially malicious HTML tag and attribute combinations by default. In default scenarios, a valid backend user account is needed to exploit this vulnerability. However, if custom plugins used in the website frontend accept and reflect rich-text content submitted by users, no authentication is required.

Recommendations Update to TYPO3 version 7.6.53 ELTS to fix the problem described. Update to TYPO3 version 8.7.42 ELTS to fix the problem described. Update to TYPO3 version 9.5.29 to fix the problem described. Update to TYPO3 version 10.4.19 to fix the problem described. Update to TYPO3 version 11.3.2 to fix the problem described. As a temporary workaround, consider restricting access to custom plugins that accept and reflect rich-text content submitted by users until a patch is available. Restrict the use of the lib.parseFunc TypoScript path and the f:format.html Fluid view-helper instruction to minimize the risk of exploitation.

Exploit

Fix

XSS

Weakness Enumeration

CWE-79

Related Identifiers

BDU:2021-04769

BIT-TYPO3-2021-32768

CVE-2021-32768

GHSA-C5C9-8C6M-727V

Affected Products

Typo3

References · 12

• 🔥 https://github.com/FriendsOfPHP/security-advisories/blob/master/typo3/cms/CVE-2021-32768.yaml · Exploit
• 🔥 https://github.com/FriendsOfPHP/security-advisories/blob/master/typo3/cms-core/CVE-2021-32768.yaml · Exploit
• https://osv.dev/vulnerability/GHSA-c5c9-8c6m-727v · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2021-32768 · Security Note
• https://bdu.fstec.ru/vul/2021-04769 · Security Note
• https://typo3.org/security/advisory/typo3-core-sa-2021-013 · Vendor Advisory
• https://osv.dev/vulnerability/BIT-typo3-2021-32768 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2021-32768 · Vendor Advisory
• https://github.com/TYPO3/TYPO3.CMS/security/advisories/GHSA-c5c9-8c6m-727v · Note
• https://github.com/TYPO3/typo3/security/advisories/GHSA-c5c9-8c6m-727v · Note
• https://t.me/cibsecurity/27083 · Telegram Post
• https://cybersecurity-help.cz/vdb/SB2021081007 · Note