high7.5
CVE-2021-42717
ModSecurity 3.x through 3.0.5 mishandles excessively nested JSON objects.
Impact
ModSecurity 3.x through 3.0.5 mishandles excessively nested JSON objects. Crafted JSON objects with nesting tens-of-thousands deep could result in the web server being unable to service legitimate requests. Even a moderately large (e.g., 300KB) HTTP request can occupy one of the limited NGINX worker processes for minutes and consume almost all of the available CPU on the machine. Modsecurity 2 is similarly vulnerable: the affected versions include 2.8.0 through 2.9.4.
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Owasp | Modsecurity | from 3.0.0 before 3.0.6 |
| Trustwave | Modsecurity | from 2.0.0 before 2.9.5 |
| F5 | Nginx Modsecurity Waf | Versions r24, r25 |
| Debian | Debian Linux | Versions 9.0, 10.0, 11.0 |
| Oracle | Http Server | Versions 12.2.1.3.0, 12.2.1.4.0 |
| Oracle | Zfs Storage Appliance Kit | Version 8.8 |
Weakness classification
References
- NVD record
- CVE.org record
- https://lists.debian.org/debian-lts-announce/2022/05/msg00042.html
- https://www.debian.org/security/2021/dsa-5023
- https://www.oracle.com/security-alerts/cpuapr2022.html
- https://www.trustwave.com/en-us/resources/blogs/spiderlabs-blog/modsecurity-dos-vulnerability-in-json-parsing-cve-2021-42717/
- https://lists.debian.org/debian-lts-announce/2022/05/msg00042.html
- https://www.debian.org/security/2021/dsa-5023
- https://www.oracle.com/security-alerts/cpuapr2022.html
- https://www.trustwave.com/en-us/resources/blogs/spiderlabs-blog/modsecurity-dos-vulnerability-in-json-parsing-cve-2021-42717/