Debian Security Advisory

DLA-3283-1 modsecurity-apache -- LTS security update

Date Reported:
26 Jan 2023
Affected Packages:
Security database references:
In the Debian bugtracking system: Bug 1029329.
In Mitre's CVE dictionary: CVE-2022-48279, CVE-2023-24021.
More information:

Multiple issues were found in modsecurity-apache, open source, cross platform web application firewall (WAF) engine for Apache which allows remote attackers to bypass the applications firewall and other unspecified impact.

  • CVE-2022-48279

    In ModSecurity before 2.9.6 and 3.x before 3.0.8, HTTP multipart requests were incorrectly parsed and could bypass the Web Application Firewall. NOTE: this is related to CVE-2022-39956 but can be considered independent changes to the ModSecurity (C language) codebase.

  • CVE-2023-24021

    Incorrect handling of null-bytes in file uploads in ModSecurity before 2.9.7 may allow for Web Application Firewall bypasses and buffer overflows on the Web Application Firewall when executing rules reading the FILES_TMP_CONTENT collection.

For Debian 10 buster, these problems have been fixed in version 2.9.3-1+deb10u2.

We recommend that you upgrade your modsecurity-apache packages.

For the detailed security status of modsecurity-apache please refer to its security tracker page at:

Further information about Debian LTS security advisories, how to apply these updates to your system and frequently asked questions can be found at: