# CVE-2022-39958: modsecurity-crs: The OWASP ModSecurity Core Rule Set (CRS) is affected by a response body bypass to sequentially exfiltrate small and...

CVE-2022-39958 is fixed in modsecurity-crs on 1 platform, first by DEBIAN-CVE-2022-39958, released September 20, 2022. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2022-39958
- Priority: High
- CVSS: 7.5 (high)
- EPSS: 0.0123
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Sep 20, 2022

## 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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | modsecurity-crs Debian 12.15 (bookworm) | 3.3.4-1 | [DEBIAN-CVE-2022-39958](https://patchblox.com/security/data/fix/linux/debian-cve-2022-39958.md) | Sep 20, 2022 |
| Linux | modsecurity-crs Debian 13.5 (trixie) | 3.3.4-1 | [DEBIAN-CVE-2022-39958](https://patchblox.com/security/data/fix/linux/debian-cve-2022-39958.md) | Sep 20, 2022 |
| Linux | modsecurity-crs Debian 14 | 3.3.4-1 | [DEBIAN-CVE-2022-39958](https://patchblox.com/security/data/fix/linux/debian-cve-2022-39958.md) | Sep 20, 2022 |

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