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From: William A. Rowe, Jr. (wrowe_at_apache.org)
Date: Thu Oct 03 2002 - 14:20:15 CDT
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Apache 1.3.27 Released
The Apache Software Foundation and The Apache Server Project are
pleased to announce the release of version 1.3.27 of the Apache HTTP
Server. This Announcement notes the significant changes in 1.3.27
as compared to 1.3.26.
This version of Apache is principally a security and bug fix release.
A summary of the bug fixes is given at the end of this document.
Of particular note is that 1.3.27 addresses and fixes 3 security
CAN-2002-0839 (cve.mitre.org): A vulnerability exists in all versions
of Apache prior to 1.3.27 on platforms using System V shared memory based
scoreboards. This vulnerability allows an attacker who can execute under
the Apache UID to exploit the Apache shared memory scoreboard format and
send a signal to any process as root or cause a local denial of service
attack. We thank iDefense for their responsible notification and
disclosure of this issue.
CAN-2002-0840 (cve.mitre.org): Apache is susceptible to a cross site
scripting vulnerability in the default 404 page of any web server hosted
on a domain that allows wildcard DNS lookups. We thank Matthew Murphy
for notification of this issue.
CAN-2002-0843 (cve.mitre.org): There were some possible overflows
in ab.c which could be exploited by a malicious server. Note that this
vulnerability is not in Apache itself, but rather one of the support
programs bundled with Apache. We thank David Wagner for the responsible
notification and disclosure of this issue.
We consider Apache 1.3.27 to be the best version of Apache 1.3 available
and we strongly recommend that users of older versions, especially of
the 1.1.x and 1.2.x family, upgrade as soon as possible. No further
releases will be made in the 1.2.x family.
Apache 1.3.27 is available for download from
Please see the CHANGES_1.3 file in the same directory for a full list
Binary distributions are available from
The source and binary distributions are also available via any of the
mirrors listed at
As of Apache 1.3.12 binary distributions contain all standard Apache
modules as shared objects (if supported by the platform) and include
full source code. Installation is easily done by executing the
included install script. See the README.bindist and INSTALL.bindist
files for a complete explanation. Please note that the binary
distributions are only provided for your convenience and current
distributions for specific platforms are not always available. Win32
binary distributions are based on the Microsoft Installer (.MSI)
technology. While development continues to make this installation method
more robust, questions should be directed to the
For an overview of new features introduced after 1.2 please see
In general, Apache 1.3 offers several substantial improvements over
version 1.2, including better performance, reliability and a wider
range of supported platforms, including Windows NT and 2000 (which
fall under the "Win32" label), OS2, Netware, and TPE threaded
IMPORTANT NOTE FOR APACHE USERS: Apache 1.3 was designed for Unix OS
variants. While the ports to non-Unix platforms (such as Win32, Netware
or OS2) are of an acceptable quality, Apache 1.3 is not optimized for
these platforms. Security, stability, or performance issues on these
non-Unix ports do not generally apply to the Unix version, due to
software's Unix origin.
Apache 2.0 has been structured for multiple operating systems from its
inception, by introducing the Apache Portability Library and MPM modules.
Users on non-Unix platforms are strongly encouraged to move up to
Apache 2.0 for better performance, stability and security on their
Apache is the most popular web server in the known universe; over half
of the servers on the Internet are running Apache or one of its
Apache 1.3.27 Major changes
* Fix the security vulnerability noted in CAN-2002-0839 (cve.mitre.org)
regarding ownership permissions of System V shared memory based
scoreboards. The fix resulted in the new ShmemUIDisUser directive.
* Fix the security vulnerability noted in CAN-2002-0840 (cvs.mitre.org)
regarding a cross-site scripting vulnerability in the default error
page when using wildcard DNS.
* Fix the security vulnerability noted in CAN-2002-0843 (cve.mitre.org)
regarding some possible overflows in ab.c which could be exploited by
a malicious server.
The main new features in 1.3.27 (compared to 1.3.26) are:
* The new ErrorHeader directive has been added.
* Configuration file globbing can now use simple pattern
* The protocol version (eg: HTTP/1.1) in the request line parsing
is now case insensitive.
* ap_snprintf() can now distinguish between an output which was
truncated, and an output which exactly filled the buffer.
* Add ProtocolReqCheck directive, which determines if Apache will
check for a valid protocol string in the request (eg: HTTP/1.1)
and return HTTP_BAD_REQUEST if not valid. Versions of Apache
prior to 1.3.26 would silently ignore bad protocol strings, but
1.3.26 included a more strict check. This makes it runtime
* Added support for Berkeley-DB/4.x to mod_auth_db.
* httpd -V will now also print out the compile time defined
New features that relate to specific platforms:
* Support Caldera OpenUNIX 8.
* Use SysV semaphores by default on OpenBSD.
* Implemented file locking in mod_rewrite for the NetWare
The following bugs were found in Apache 1.3.26 (or earlier) and have
been fixed in Apache 1.3.27:
* mod_proxy fixes:
- The cache in mod_proxy was incorrectly updating the Content-Length
value from 304 responses when doing validation.
- Fix a problem in proxy where headers from other modules were
added to the response headers when this was already done in the
* In 1.3.26, a null or all blank Content-Length field would be
triggered as an error; previous versions would silently ignore
this and assume 0. 1.3.27 restores this previous behavior.
* Win32: Fix one byte buffer overflow in ap_get_win32_interpreter
when a CGI script's #! line does not contain a \r or \n (i.e.
a line feed character) in the first 1023 bytes. The overflow
is always a '\0' (string termination) character.
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