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| | PHP Integer Overflows in pack() and unpack() and Bugs in realpath() and unserialize() May Allow Users to Bypass safe_mode and Execute Arbitrary Code |
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Categorie: Vulnerability
Posted: 2004-12-20 by ReCall
Views: 657
Source: Click here
| Current Rating: Not rated
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| | Details |
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Description: Several vulnerabilities were reported in PHP. A local or remote user may be able to execute arbitrary code on the target system.
Stefan Esser of the Hardened-PHP Project reported a variety of vulnerabilities affecting PHP.
It is reported that the pack() and unpack() functions contain integer overflows [CVE: CAN-2004-1018]. A user may be able to supply specially crafted inputs to bypass safe_mode restrictions and execute arbitrary code with the privileges of the target web service.
It is also reported that a local user can bypass the safe_mode_exec_dir settings when safe_mode is enabled on a multithreaded UNIX/Linux web server by injecting shell commands into the name of the current directory [CVE: CAN-2004-1063].
It is also reported that a path truncation flaw in realpath() allows a user to bypass safe_mode restrictions or to include arbitrary files in certain cases [CVE: CAN-2004-1064].
Two vulnerabilities were reported in the unserialize() function [CVE: CAN-2004-1019]. Negative references or incorrect processing of references may free arbitrary memory addresses, causing arbitrary code to be executed. If a PHP application provides remote user-input to the unserialize() function, these bugs may be exploitable by remote users.
The original advisory is available at:
http://www.hardened-php.net/advisories/012004.txt
Impact: A local or remote user may be able to execute arbitrary code on the target system.
Solution: The vendor has released fixed versions (4.3.10 and 5.0.3), available at:
http://www.php.net/downloads.php
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