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Apache mod_ssl "ssl_util_uuencode_binary()" Buffer Overflow Vulnerability
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Secunia Advisory:
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SA11534
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Release Date:
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2004-05-28
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Popularity:
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20,488 views
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Critical:
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Moderately 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
Apache 2.0.x
mod_ssl 2.x
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| CVE reference: | CVE-2004-0488
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Description:
Georgi Guninski has discovered a vulnerability in mod_ssl, which potentially can be exploited by malicious people to cause a DoS (Denial of Service) or compromise a vulnerable system.
The vulnerability is caused due to a boundary error within the "ssl_util_uuencode_binary()" function when handling client certificates. This can potentially be exploited to cause a stack-based buffer overflow by sending a specially crafted client certificate containing an overly long subject DN (more than 6KB).
Successful exploitation requires that the "FakeBasicAuth" option is enabled and that the malicious client certificate is issued from a trusted CA (Certificate Authority).
Solution:
Update to version 2.8.18 for Apache 1.3.31:
http://www.modssl.org/source/mod_ssl-2.8.18-1.3.31.tar.gz
A fix for the Apache 2.0 branch is available via CVS:
http://cvs.apache.org/viewcvs.cgi/htt...engine_kernel.c?r1=1.105&r2=1.106
Provided and/or discovered by:
Georgi Guninski
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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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