CVE-2020-15098: Missing Required Cryptographic Step Leading to Sensitive Information Disclosure in TYPO3 CMS
8.8
CVSS Score
3.1
Basic Information
CVE ID
GHSA ID
EPSS Score
0.8443%
CWE
Published
7/29/2020
Updated
2/5/2024
KEV Status
No
Technology
PHP
Technical Details
CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Package Name | Ecosystem | Vulnerable Versions | First Patched Version |
---|---|---|---|
typo3/cms-core | composer | >= 9.0.0, < 9.5.20 | 9.5.20 |
typo3/cms-core | composer | >= 10.0.0, < 10.4.6 | 10.4.6 |
typo3/cms | composer | >= 10.0.0, < 10.4.6 | 10.4.6 |
typo3/cms | composer | >= 9.0.0, < 9.5.20 | 9.5.20 |
Vulnerability Intelligence
Miggo AI
Root Cause Analysis
The vulnerability stemmed from missing context-specific keys in HMAC-SHA1
generation, as shown in the commit diff. The patch added a mandatory second parameter ('backend-link-browser') to GeneralUtility::hmac()
calls to scope the cryptographic hashes. The pre-patch HMAC
implementations without this parameter allowed attackers to generate valid HMACs
for malicious payloads by exploiting the missing cryptographic step (CWE-325). This directly enabled the documented attack chains (privilege escalation, deserialization RCE) via forged HMAC
validation. The files/functions modified in the security patch are the unambiguous source of the vulnerability.