Code injection in WordPress - CVE-2019-8942
Published: February 20, 2019 / Updated: March 1, 2019
Vulnerability identifier: #VU17803
CSH Severity: High
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:A/U:Amber
CVE-ID: CVE-2019-8942
CWE-ID: CWE-94
Exploitation vector: Remote access
Exploit availability:
Public exploit is available
Vendor: WordPress.ORG
Affected software:
WordPress
WordPress
Detailed vulnerability description
The vulnerability allows a remote attacker to execute PHP code on the target system.
The weakness exists due to an _wp_attached_file Post Meta entry can be changed to an arbitrary string, such as one ending with a .jpg?file.php substring. A remote attacker can upload a crafted image containing PHP code in the Exif metadata and execute arbitrary code.
Successful exploitation of the vulnerability allows to leverage SB2019022004.
The weakness exists due to an _wp_attached_file Post Meta entry can be changed to an arbitrary string, such as one ending with a .jpg?file.php substring. A remote attacker can upload a crafted image containing PHP code in the Exif metadata and execute arbitrary code.
Successful exploitation of the vulnerability allows to leverage SB2019022004.
How to mitigate CVE-2019-8942
The vulnerability has been addressed in the versions 4.9.9, 5.0.1.