SB2019082209 - Code Injection in Ad Inserter – Ad Manager & AdSense Ads for WordPress

Description

This security bulletin contains information about 1 vulnerability.

1) Code Injection (CVE-ID: CVE-2019-15324)

CWE-ID: CWE-94 - Improper Control of Generation of Code ('Code Injection')

CVSSv4: 9.4 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H]

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to improper input validation in "current_user_can()" function. A remote authenticated attacker can compromise a valid nonce for the "ai_ajax_backend" action with special cookie and execute arbitrary code on the target system. 

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

Remediation

Install update from vendor's website.

References

• https://wordpress.org/plugins/ad-inserter/#developers
• https://plugins.trac.wordpress.org/changeset/2122577/ad-inserter
• https://www.wordfence.com/blog/2019/07/critical-vulnerability-patched-in-ad-inserter-plugin/