QID 150480

Date Published: 2022-03-09

QID 150480: Improper Handling of XML Functions in PHP (CVE-2021-21707)

PHP is a programming language originally designed for use in web-based applications with HTML content. PHP supports a wide variety of platforms and is used by numerous web-based software applications.

The vulnerability exists due to insufficient validation of user-supplied input within the XML functions like simplexml_load_file() when processing NULL byte character (e.g. %00). A remote attacker can pass specially crafted URL to the application and bypass implemented security restrictions.

Affected versions:
7.3.x below 7.3.33
7.4.x below 7.4.26
8.0.x below 8.0.13

QID Detection Logic (Unauthenticated):
This QID checks the HTTP Server header to see if the server is running a vulnerable version of PHP.

Successful exploitation of this vulnerability could lead to disclosure of sensitive information.

CVSS V3 rated as Medium - 5.3 severity.

CVSS V2 rated as Medium - 5 severity.

Solution

Customers are advised to upgrade to the latest version of PHP.

Vendor References

Sec Bug 79971 - bugs.php.net/bug.php?id=79971

CVEs related to QID 150480

CVE-2021-21707 |

Software Advisories

Advisory ID	Software	Component	Link
Sec Bug 79971			bugs.php.net/bug.php?id=79971

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