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Date: Mon, 23 Nov 2009 13:29:42 +0100
From: Jan Lieskovsky <>
CC: Joe Orton <>
Subject: Re: CVE request: php 5.3.1 -  proc_open() bypass PHP
 Bug #49026 [was: Re: CVE request: php 5.3.1 update]

Hi Brian,

security curmudgeon wrote:
> On Fri, 20 Nov 2009, Thomas Biege wrote:
> : PHP was updated to version 5.3.1 and did also address security
> : issues:
> : 
> : Security Enhancements and Fixes in PHP 5.3.1:
> : 
> :     * Added "max_file_uploads" INI directive, which can be set to limit the number of file uploads per-request to 20 by default, to prevent possible DOS via temporary file exhaustion.
> :     * Added missing sanity checks around exif processing.
> This was previously disclosed and fixed in the 5.2.x tree. I believe this 
> is the same as CVE-2009-3292.
> :     * Fixed a safe_mode bypass in tempnam().
> :     * Fixed a open_basedir bypass in posix_mkfifo().
> :     * Fixed bug #50063 (safe_mode_include_dir fails).
> :     * Fixed bug #44683 (popen crashes when an invalid mode is passed).
> Also not flagged as 'security' up top, but from the changelog:
> Fixed bug #49026 (proc_open() can bypass safe_mode_protected_env_vars 
> restrictions). (Ilia)

   Thank you for pointing this out.

   Yes, further look into particular php bugzilla returns:

     "Environment variables specified for proc_open passed without check so
      safe_mode_allowed_env_vars and safe_mode_protected_env_vars settings are
      ignored. So it become possible to use buffer overflow exploit with
      "" to bypass safe_mode restrictions and get
      access to any files acessible for apache uid."

   So looks another CVE id is needed here. Changed subject to:
   "CVE request: php 5.3.1 - proc_open() bypass PHP Bug #49026"

   Could we get another CVE id for this case?

Thanks && Regards, Jan.
Jan iankko Lieskovsky / Red Hat Security Response Team

> Brian

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