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Last updated: 4/17/2014

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National Cyber Awareness System

Vulnerability Summary for CVE-2007-3303

Original release date: 06/20/2007
Last revised: 10/30/2012
Source: US-CERT/NIST

Overview

Apache httpd 2.0.59 and 2.2.4, with the Prefork MPM module, allows local users to cause a denial of service via certain code sequences executed in a worker process that (1) stop request processing by killing all worker processes and preventing creation of replacements or (2) hang the system by forcing the master process to fork an arbitrarily large number of worker processes. NOTE: This might be an inherent design limitation of Apache with respect to worker processes in hosted environments.

Impact

CVSS Severity (version 2.0):
CVSS v2 Base Score: 4.9 (MEDIUM) (AV:L/AC:L/AU:N/C:N/I:N/A:C) (legend)
Impact Subscore: 6.9
Exploitability Subscore: 3.9
CVSS Version 2 Metrics:
Access Vector: Locally exploitable
Access Complexity: Low
Authentication: Not required to exploit
Impact Type: Allows disruption of service

Vendor Statements (disclaimer)

Official Statement from Apache (07/02/2008)
In the security model used by Apache httpd, the less-privileged child processes completely handle the servicing of new connections. Any local user who is able to run arbitrary code in those children is therefore able to prevent new requests from being serviced, by design. Such users will also be able to "simulate" server load and force the parent to create children up to the configured limits, by design. A server with untrusted local users must be configured to use a solution like "suexec" if its required to allow the users to execute CGI (etc) scripts.
Official Statement from Red Hat (06/26/2007)
Not a vulnerability. In the security model used by Apache httpd, the less-privileged child processes (running as the "apache" user) completely handle the servicing of new connections. Any local user who is able to run arbitrary code in those children is therefore able to prevent new requests from being serviced, by design. Such users will also be able to "simulate" server load and force the parent to create children up to the configured limits, by design.

References to Advisories, Solutions, and Tools

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External Source: SREASON
Name: 2814
External Source: BUGTRAQ
Name: 20070529 Apache httpd vulenrabilities
External Source: MISC
Name: http://security.psnc.pl/files/apache_report.pdf
External Source: OSVDB
Name: 37050
External Source: BUGTRAQ
Name: 20070619 Apache Prefork MPM vulnerabilities - Report
External Source: BID
Name: 24215

Technical Details

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