Bug 2131321 (CVE-2022-39958) - CVE-2022-39958 mod_security_crs: Small range header leading to response rule set bypass
Summary: CVE-2022-39958 mod_security_crs: Small range header leading to response rule ...
Keywords:
Status: NEW
Alias: CVE-2022-39958
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 2131322 2131350 2131351
Blocks: 2128790
TreeView+ depends on / blocked
 
Reported: 2022-09-30 17:11 UTC by Guilherme de Almeida Suckevicz
Modified: 2022-10-07 13:59 UTC (History)
2 users (show)

Fixed In Version: mod_security_crs 3.2.2, mod_security_crs 3.3.3
Doc Type: If docs needed, set a value
Doc Text:
A flaw was found in the OWASP ModSecurity Core Rule Set. Repeated payloads with a HTTP range header field with a small byte range allows a response body bypass, resulting in access to restricted resources.
Clone Of:
Environment:
Last Closed:


Attachments (Terms of Use)

Description Guilherme de Almeida Suckevicz 2022-09-30 17:11:47 UTC
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.

Reference:
https://coreruleset.org/20220919/crs-version-3-3-3-and-3-2-2-covering-several-cves/

Comment 1 Guilherme de Almeida Suckevicz 2022-09-30 17:12:01 UTC
Created mod_security_crs tracking bugs for this issue:

Affects: fedora-all [bug 2131322]


Note You need to log in before you can comment on or make changes to this bug.