CVE-2021-21338 is a vulnerability in TYPO3
Published on March 23, 2021
Open Redirection in Login Handling
TYPO3 is an open source PHP based web content management system. In TYPO3 before versions 6.2.57, 7.6.51, 8.7.40, 9.5.25, 10.4.14, 11.1.1 it has been discovered that Login Handling is susceptible to open redirection which allows attackers redirecting to arbitrary content, and conducting phishing attacks. No authentication is required in order to exploit this vulnerability. This is fixed in versions 6.2.57, 7.6.51, 8.7.40, 9.5.25, 10.4.14, 11.1.1.
Vulnerability Analysis
CVE-2021-21338 is exploitable with network access, requires user interaction. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to have no impact on confidentiality, with no impact on integrity, and no impact on availability.
Weakness Type
What is an Open Redirect Vulnerability?
A web application accepts a user-controlled input that specifies a link to an external site, and uses that link in a Redirect. This simplifies phishing attacks. An http parameter may contain a URL value and could cause the web application to redirect the request to the specified URL. By modifying the URL value to a malicious site, an attacker may successfully launch a phishing scam and steal user credentials. Because the server name in the modified link is identical to the original site, phishing attempts have a more trustworthy appearance.
CVE-2021-21338 has been classified to as an Open Redirect vulnerability or weakness.
Products Associated with CVE-2021-21338
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Affected Versions
TYPO3.CMS:- Version >= 6.2.0, <= 6.2.56 is affected.
- Version >= 7.0.0, <= 7.6.50 is affected.
- Version >= 8.0.0, <= 8.7.39 is affected.
- Version >= 9.0.0, <= 9.5.24 is affected.
- Version >= 10.0.0, <= 10.4.13 is affected.
- Version >= 11.0.0, <= 11.1.0 is affected.
Vulnerable Packages
The following package name and versions may be associated with CVE-2021-21338
| Package Manager | Vulnerable Package | Versions | Fixed In |
|---|---|---|---|
| composer | typo3/cms-core | >= 6.2.0, <= 6.2.56 | 6.2.57 |
| composer | typo3/cms-core | >= 7.0.0, <= 7.6.50 | 7.6.51 |
| composer | typo3/cms-core | >= 8.0.0, <= 8.7.39 | 8.7.40 |
| composer | typo3/cms-core | >= 9.0.0, <= 9.5.24 | 9.5.25 |
| composer | typo3/cms-core | >= 10.0.0, <= 10.4.13 | 10.4.14 |
| composer | typo3/cms-core | >= 11.0.0, <= 11.1.0 | 11.1.1 |
Exploit Probability
EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.