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"mod_ntlm" Heap Overflow and Format String Vulnerability
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Secunia Advisory:
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SA8645
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Release Date:
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2003-04-23
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Popularity:
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4,632 views
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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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Unpatched
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| Software: | mod_ntlm 0.x
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Description:
Two vulnerabilities have been identified in "mod_ntlm", which is a module available for the Apache web server.
Both vulnerabilities exist in the function "log()" and are caused due to a boundary error and a format string error. A malicious person can exploit the vulnerabilities by either supplying format specifiers or about 2048 bytes of specially crafted data in the "Authorization:" header.
Successful exploitation can result in execution of arbitrary code on the vulnerable system with the privileges of the web server.
The following two examples were included in the original advisory:
GET / HTTP/1.0
Authorization: [Ax3000]
GET / HTTP/1.0
Authorization: %n%n%n%n
Solution:
Filter requests with format specifiers or a great amount of data in the "Authorization:" header.
Provided and/or discovered by:
Matthew Murphy
Original Advisory:
http://sourceforge.net/tracker/index....468&group_id=4906&atid=104906
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Please note: The information that this Secunia Advisory is based on comes from a third party unless stated otherwise.
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