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Apache Linefeed Denial of Service Vulnerability
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Secunia Advisory:
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SA8499
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Release Date:
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2003-04-03
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Last Update:
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2003-04-14
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Popularity:
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9,621 views
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Critical:
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Moderately critical
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Impact:
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DoS
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Where:
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From remote
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Solution Status:
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Vendor Patch
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| Software: | Apache 2.0.x
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Subscribe:
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| | CVE reference: | CVE-2003-0132
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Description:
A vulnerability has been identified in Apache version 2.0.x prior to version 2.0.45, which can be exploited by malicious people to cause a DoS (Denial of Service) on a vulnerable webserver.
The vulnerability is caused by an exceptional handling error, which can lead to exhaustion of all available memory ressources. The problem is that Apache HTTP Server allocates 80 bytes of memory for each linefeed ("\n") encountered in a HTTP request without specifying an upper boundary.
A malicious person can exploit this by sending multiple HTTP request including large chunks of linefeeds to the webserver, which in the end causes the system to crash.
NOTE: Apache 2.0.45 also fixes another well-known issue. Several file descriptors are leaked to child processes, such as CGI scripts, which could consitute a security threat on servers running untrusted CGI scripts.
Solution:
Update to version 2.0.45:
http://httpd.apache.org/download.cgi
Apply patch for version 2.0.44:
http://www.apache.org/dist/httpd/patc...to_2.0.44/denial_of_service_fix.patch
Provided and/or discovered by:
Denial of Service vulnerability:
David Endler
Leaked file descriptors:
Christian Kratzer and Bjoern Zeeb
Changelog:
2003-04-08: Details released about the vulnerability. "Description" updated accordingly.
2003-04-14: Apache Project released patch for version 2.0.44.
Original Advisory:
http://www.apache.org/dist/httpd/CHANGES_2.0
Other References:
http://www.idefense.com/advisory/04.08.03.txt
http://www.kb.cert.org/vuls/id/206537
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About this Secunia Advisory
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Please note: The information that this Secunia Advisory is based on comes from a third party unless stated otherwise.
Secunia collects, validates, and verifies all vulnerability reports issued by security research groups, vendors, and others.
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21st Nov, 2008
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