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Apache mod_proxy "Content-Length:" Header Buffer Overflow Vulnerability
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Secunia Advisory:
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SA11841
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Release Date:
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2004-06-10
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Last Update:
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2005-10-14
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Critical:
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Highly critical
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Impact:
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DoS
System access
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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 1.3.x
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| | CVE reference: | CVE-2004-0492 (Secunia mirror)
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Description:
Georgi Guninski has discovered a vulnerability in Apache, which can be exploited by malicious people to cause a DoS (Denial of Service) and potentially compromise a vulnerable system.
The vulnerability is caused due to a boundary error within the Apache mod_proxy module. This can be exploited to cause a heap-based buffer overflow by passing a "Content-Length:" header containing a large negative value.
Successful exploitation may reportedly crash the child process and potentially allow code execution on some BSD systems, if an Apache server, which is configured as a proxy, connects to a malicious site.
The vulnerability affects versions 1.3.31, 1.3.29, 1.3.28, 1.3.27, and 1.3.26.
Solution:
Update to version 1.3.32.
http://httpd.apache.org/download.cgi
Provided and/or discovered by:
Georgi Guninski
Changelog:
2004-10-20: Added link to US-CERT vulnerability note.
2004-10-22: Updated "Solution" section.
2005-10-14: Added link to "Original Advisory".
Original Advisory:
Apache.org:
http://www.apache.org/dist/httpd/Announcement1.3.html
Georgi Guninski:
http://www.guninski.com/modproxy1.html
Other References:
US-CERT VU#541310:
http://www.kb.cert.org/vuls/id/541310
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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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