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(From the Apache announcements list.)
Date: Sat, 12 May 2001 16:21:13 -0500 From: "William A. Rowe, Jr." Subject: [Announce] Apache 1.3 Security Fix Available for Win32/OS2 usersPorts Affected: Windows 95, 98, ME, NT and 2000, OS2/Warp
Versions Affected: 1.3 [all subversions through .19]
Replacement Binary: Available for Apache 1.3.19
An exploit was recently reported that allows a malicious user to terminate the Apache server running on Win32 or OS2.
Depending on the specific OS version, the server would stop listening to further requests, and prompt the operator that the Apache.exe process had performed an illegal operation, and would remain hung until the administrator cleared the fault.
In all cases the server would not respond until it completed its restart, which could take one minute or more depending on the server's configuration. Any replies in process from the server would be terminated.
No other operating systems are effected by the vulnerability. We are not aware of any exploits of this vulnerability other than the denial of service.
The fixfault_win32_os2-1.3.19.patch file is available from:
Since many Win32 and OS2 users rely on soley on binary releases, the replacement for the core binary module file is available in the win32 and os2 directories:
Please read the information on those download pages carefully, and be sure to back up your existing ApacheCore.dll file before replacing it with this binary.
Note that users of non-standard distributions, such as the Apache-EAPI extensions or ApacheSSL-enabled servers _cannot_ use this patched binary. Either refer to the distributor or vendor of your Apache build for updated binaries, or apply the patch to the sources, where available, and recompile the server.
Users of older versions of Apache on Win32 and OS2 platforms are cautioned to to upgrade to 1.3.19 and apply this fix. All Win32 and OS2 users are strongly encouraged to upgrade to 1.3.20 once it is released. A large number of Win32 bugs have been identified over time, and 1.3.20 will introduce more fixes for Win32.
Configuration help for Windows users is by peer-support at the newsgroup:
No talkbacks posted.
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