mod_cgi in Apache 2.0.39 and 2.0.40 allows local users and possibly remote attackers to cause a denial of service (hang and memory consumption) by causing a CGI script to send a large amount of data to stderr, which results in a read/write deadlock between httpd and the CGI script.

References

• https://nvd.nist.gov/vuln/detail/CVE-2002-1850
• http://cvs.apache.org/viewcvs.cgi/httpd-2.0/modules/generators/mod_cgi.c?r1=1.148.2.7&r2=1.148.2.8
• http://issues.apache.org/bugzilla/show_bug.cgi?id=10515
• http://issues.apache.org/bugzilla/show_bug.cgi?id=22030
• http://marc.info/?l=apache-httpd-dev&m=103291952019514&w=2
• http://seclists.org/bugtraq/2002/Sep/0253.html
• http://securitytracker.com/id?1007823
• http://www.iss.net/security_center/static/10200.php
• http://www.securityfocus.com/bid/5787
• http://www.securityfocus.com/bid/8725