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If through a vulnerability assessment, a network security issue is detected for the vulnerability below, applying the appropriate security patches in a timely matter is very important. If you have detected that your system has already been compromised, following CERT's Network Security recovery document will assist with recommended steps for system recovery.
Vulnerability Assessment Details
Check for the version of the apache2 package
Detailed Explanation for this Vulnerability Assessment
The remote host is missing the patch for the advisory MDKSA-2003:096-1 (apache2).
A problem was discovered in Apache2 where CGI scripts that output more than 4k
of output to STDERR will hang the script's execution which can cause a Denial of
Service on the httpd process because it is waiting for more input from the CGI
that is not forthcoming due to the locked write() call in mod_cgi.
On systems that use scripts that output more than 4k to STDERR, this could cause
httpd processes to hang and once the maximum connection limit is reached, Apache
will no longer respond to requests.
The updated packages provided use the latest mod_cgi.c from the Apache 2.1 CVS
Users may have to restart apache by hand after the upgrade by issuing a 'service
The previous update introduced an experimental mod_cgi.c that while fixing the
deadlock did not do so in a correct manner and it likewise introduced new
problems with other scripts.
These packages roll back to the original mod_cgi.c until such a time as the
apache team have a proper fix in place. Both Mandrake Linux 9.1 and 9.2 are
affected with this problem.
Likewise, a problem was discovered in the default mod_proxy configuration which
created an open proxy. Users who have installed mod_perl also have mod_proxy
installed due to dependencies and may unknowingly have permited spammers to use
their MTA via the wide-open mod_proxy settings.
MandrakeSoft encourages all users to upgrade to these new packages immediately.
Solution : http://wwwnew.mandriva.com/security/advisories?name=MDKSA-2003:096-1
Network Security Threat Level: High
Networks Security ID:
Vulnerability Assessment Copyright: This script is Copyright (C) 2004 Tenable Network Security
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