Date: Mon, 23 Nov 2009 15:49:28 -0500 (EST) From: Josh Bressers <bressers@...hat.com> To: oss-security@...ts.openwall.com Cc: Joe Orton <jorton@...hat.com>, coley <coley@...re.org> Subject: Re: CVE request: php 5.3.1 - proc_open() bypass PHP Bug #49026 [was: Re: CVE request: php 5.3.1 update] CVE-2009-4018 PHP before 5.3.1 proc_open() can be used to bypass the safe_mode_protected_env_vars INI setting. This could be used to alter the process environment possibly executing arbitrary code. http://www.php.net/ChangeLog-5.php#5.3.1 http://bugs.php.net/bug.php?id=49026 http://marc.info/?l=oss-security&m=125897935330618&w=2 Thanks. -- JB ----- "Jan Lieskovsky" <jlieskov@...hat.com> wrote: > 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: http://www.php.net/releases/5_3_1.php > > : > > : 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 > "LD_PRELOAD=evil_library.so" 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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