** DISPUTED ** The Zend Engine in PHP before 5.4.16 RC1, and 5.5.0 before RC2, does not properly determine whether a parser error occurred, which allows context-dependent attackers to cause a denial of service (memory consumption and application crash) via a crafted function definition, as demonstrated by an attack within a shared web-hosting environment. NOTE: the vendor's http://php.net/security-note.php page says "for critical security situations you should be using OS-level security by running multiple web servers each as their own user id."
The MITRE CVE dictionary describes this issue as:
Find out more about CVE-2013-3735 from the MITRE CVE dictionary dictionary and NIST NVD.
We do not consider memory safety hazards caused by malformed php scripts as a security issue. Also (as per upstream) OS-level security should be used to protect systems from memory exhaustion caused by php applications.
NOTE: The following CVSS v2 metrics and score provided are preliminary and subject to review.
| Base Score | 5 |
|---|---|
| Base Metrics | AV:N/AC:L/Au:N/C:N/I:N/A:P |
| Access Vector | Network |
| Access Complexity | Low |
| Authentication | None |
| Confidentiality Impact | None |
| Integrity Impact | None |
| Availability Impact | Partial |
Find out more about Red Hat support for the Common Vulnerability Scoring System (CVSS).
| Platform | Package | State |
|---|---|---|
| Red Hat Enterprise Linux 6 | php | Will not fix |
| Red Hat Enterprise Linux 5 | php | Will not fix |
| Red Hat Enterprise Linux 5 | php53 | Will not fix |
Vulmon