CVE-2022-39958 Security feature bypass in ModSecurity Core Rule Set
Attackers can bypass WAF protections to exfiltrate restricted data by using repeated small HTTP Range requests, requiring upgrades or higher paranoia levels.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2022-39958?
CVE-2022-39958 is a high-severity vulnerability in Debian Debian Linux, published on 20 Sep 2022. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
The OWASP ModSecurity Core Rule Set (CRS) is affected by a response body bypass to sequentially exfiltrate small and undetectable sections of data by repeatedly submitting an HTTP Range header field with a small byte range. A restricted resource, access to which would ordinarily be detected, may be exfiltrated from the backend, despite being protected by a web application firewall that uses CRS. Short subsections of a restricted resource may bypass pattern matching techniques and allow undetected access. The legacy CRS versions 3.0.x and 3.1.x are affected, as well as the currently supported versions 3.2.1 and 3.3.2. Integrators and users are advised to upgrade to 3.2.2 and 3.3.3 respectively and to configure a CRS paranoia level of 3 or higher.
Which versions are affected by CVE-2022-39958?
It affects 3 products.
Products include Debian Debian Linux, Fedoraproject Fedora, Owasp Owasp Modsecurity Core Rule Set.
How do I fix CVE-2022-39958?
Upgrade to a fixed version.
Is CVE-2022-39958 being exploited?
There is no known exploitation of CVE-2022-39958 in the wild and no public exploit code.
Other vulnerabilities in Debian Debian Linux
Sources
Also known as DEBIAN-CVE-2022-39958, GHSA-3m69-hv34-fc7r, UBUNTU-CVE-2022-39958.