Input validation error in PHP - CVE-2007-4657

Detailed vulnerability description

The vulnerability allows remote attackers to perform a denial of service (DoS) attack.

The vulnerability exists due to insufficient validation of user-supplied input. A remote attacker can obtain sensitive information (memory contents) or cause a denial of service (thread crash) via a large len value to the (1) strspn or (2) strcspn function, which triggers an out-of-bounds read.

How to mitigate CVE-2007-4657

Sources

• http://secunia.com/advisories/26642
• http://secunia.com/advisories/26822
• http://secunia.com/advisories/26838
• http://secunia.com/advisories/27102
• http://secunia.com/advisories/27377
• http://secunia.com/advisories/27864
• http://secunia.com/advisories/28249
• http://secunia.com/advisories/28318
• http://secunia.com/advisories/28936
• http://secunia.com/advisories/30288
• http://secweb.se/en/advisories/php-strcspn-information-leak-vulnerability/
• http://slackware.com/security/viewer.php?l=slackware-security&y=2008&m=slackware-security.335136
• http://www.debian.org/security/2008/dsa-1444
• http://www.debian.org/security/2008/dsa-1578
• http://www.gentoo.org/security/en/glsa/glsa-200710-02.xml
• http://www.php.net/ChangeLog-4.php
• http://www.php.net/ChangeLog-5.php#5.2.4
• http://www.php.net/releases/4_4_8.php
• http://www.php.net/releases/5_2_4.php
• http://www.trustix.org/errata/2007/0026/
• http://www.ubuntu.com/usn/usn-549-2
• http://www.vupen.com/english/advisories/2007/3023
• http://www.vupen.com/english/advisories/2008/0059
• https://exchange.xforce.ibmcloud.com/vulnerabilities/36388
• https://exchange.xforce.ibmcloud.com/vulnerabilities/39399
• https://issues.rpath.com/browse/RPL-1693
• https://issues.rpath.com/browse/RPL-1702
• https://launchpad.net/bugs/173043
• https://usn.ubuntu.com/549-1/