Auth bypass in Brandexponents Tatsu
CVE-2021-25094
The Tatsu WordPress plugin before 3.3.12 add_custom_font action can be used without prior authentication to upload a rogue zip file which is uncompressed under the WordPress's upload directory. By adding a PHP shell with a filename starting with a dot ".", this can bypass extension control implemented in the plugin. Moreover, there is a race condition in the zip extraction process which makes the shell file live long enough on the filesystem to be callable by an attacker.
Vulnerability class: Broken Authentication
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.1 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.834 (99.7th percentile), scored .
High probability of exploitation in the next 30 days — patch promptly. 100th percentile — 99.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.834 · newest: 0.834 · change: 0.000
Affected products
- Brandexponents Tatsu
- Tatsu — versions 3.3.12
Weakness classification (CWE)
Public proof-of-concept exploits
References
- wpscan.com/vulnerability/fb0097a0-5d7b-4e5b-97de-aacafa8fffcd (Exploit, Third Party Advisory)
- darkpills.com/wordpress-tatsu-builder-preauth-rce-cve-2021-25094/ (Exploit, Third Party Advisory)
- packetstormsecurity.com/files/167190/WordPress-Tatsu-Builder-Remote-Code-Execut… (Exploit, VDB Entry, Third Party Advisory)
- af854a3a-2127-422b-91ae-364da2661108
- af854a3a-2127-422b-91ae-364da2661108
Frequently asked questions
- What is CVE-2021-25094?
- CVE-2021-25094 is a high-severity vulnerability in Brandexponents Tatsu, classified under Missing Authentication for Critical Function. CVSS score: 8.1/10. Published 2022-04-25.
- How severe is CVE-2021-25094?
- High severity. CVSS v3 base score is 8.1 out of 10.
- Is CVE-2021-25094 known to be exploited?
- 21 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.