Bug 240167 (CVE-2007-1700) - CVE-2007-1700 php session extension refcount handling issue
Summary: CVE-2007-1700 php session extension refcount handling issue
Alias: CVE-2007-1700
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
: 239321 (view as bug list)
Depends On:
TreeView+ depends on / blocked
Reported: 2007-05-15 16:01 UTC by Joe Orton
Modified: 2007-05-15 16:02 UTC (History)
1 user (show)

Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Clone Of:
Last Closed: 2007-05-15 16:02:29 UTC

Attachments (Terms of Use)

Description Joe Orton 2007-05-15 16:01:37 UTC
Description of problem:
The session extension in PHP 4 before 4.4.5, and PHP 5 before 5.2.1, calculates
the reference count for the session variables without considering the internal
pointer from the session globals, which allows context-dependent attackers to
execute arbitrary code via a crafted string in the session_register after
unsetting HTTP_SESSION_VARS and _SESSION, which destroys the session data Hashtable.

Comment 1 Joe Orton 2007-05-15 16:02:29 UTC
The PHP interpreter does not offer a reliable "sandboxed" security layer (as
found in, say, a JVM) in which untrusted scripts can be run; any script run by
the PHP interpreter must be trusted with the privileges of the interpreter itself.

The bug described in CVE-2007-1700 can only be triggered by a script author;
since no trust boundary is crossed, this issue is not treated as security-sensitive.

Comment 2 Joe Orton 2007-05-15 16:02:41 UTC
*** Bug 239321 has been marked as a duplicate of this bug. ***

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