(Vendor Issues Fix) Apache mod_ssl Stack Overflow in ssl_util_uuencode_binary() May Let Remote Users Execute Arbitrary Code
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SecurityTracker Alert ID: 1010620 |
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SecurityTracker URL: http://securitytracker.com/id/1010620
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CVE Reference:
CAN-2004-0488
(Links to External Site)
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Date: Jul 1 2004
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Impact:
Execution of arbitrary code via network, User access via network
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Fix Available: Yes Vendor Confirmed: Yes
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Version(s): Prior to Apache 2.0.50
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Description:
A buffer overflow vulnerability was reported in Apache mod_ssl. A remote user may be able to execute arbitrary code on the target system in certain situations.
Georgi Guninski reported that the ssl_util_uuencode_binary() function in 'ssl_util.c' may allow a remote user to supply a specially crafted Subject-DN in a client certificate to trigger the overflow. According to OpenPKG, the overflow resides in the "SSLOptions +FakeBasicAuth" implementation of mod_ssl and can be triggered if the Subject-DN is longer than 6 KB and mod_ssl is configured to trust the certificate's issuing CA.
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Impact:
A remote user may be able to execute arbitrary code on the target system in certain cases.
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Solution:
The vendor has issued a fixed version (2.0.50) of the Apache HTTP Server, available at:
http://httpd.apache.org/download.cgi
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Vendor URL: www.modssl.org/ (Links to External Site)
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Cause:
Boundary error
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Underlying OS:
Linux (Any), UNIX (Any), Windows (Any)
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Message History:
This archive entry is a follow-up to the message listed below.
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Source Message Contents
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Date: Thu, 01 Jul 2004 01:28:48 +0200
Subject: [ANNOUNCE] Apache HTTP Server 2.0.50 Released
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Apache HTTP Server 2.0.50 Released
The Apache Software Foundation and the The Apache HTTP Server Project are
pleased to announce the release of version 2.0.50 of the Apache HTTP
Server ("Apache"). This Announcement notes the significant changes
in 2.0.50 as compared to 2.0.49. The Announcement is also available in
German from:
http://www.apache.org/dist/httpd/Announcement2.txt.de
This version of Apache is principally a bug fix release. A summary of
the bug fixes is given at the end of this document. Of particular
note is that 2.0.50 addresses two security vulnerabilities:
A remotely triggered memory leak in http header parsing can allow a
denial of service attack due to excessive memory consumption.
[http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0493]
Fixes a mod_ssl buffer overflow in the FakeBasicAuth code for a
(trusted) client certificate subject DN which exceeds 6K in length.
[http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0488]
This release is compatible with modules compiled for 2.0.42 and later
versions. We consider this release to be the best version of Apache
available and encourage users of all prior versions to upgrade.
Apache HTTP Server 2.0.50 is available for download from
http://httpd.apache.org/download.cgi
Please see the CHANGES_2.0 file, linked from the above page, for
a full list of changes.
Apache 2.0 offers numerous enhancements, improvements, and performance
boosts over the 1.3 codebase. For an overview of new features introduced
after 1.3 please see
http://httpd.apache.org/docs-2.0/new_features_2_0.html
When upgrading or installing this version of Apache, please keep
in mind the following:
If you intend to use Apache with one of the threaded MPMs, you must
ensure that the modules (and the libraries they depend on) that you
will be using are thread-safe. Please contact the vendors of these
modules to obtain this information.
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