a-blog CMS Untrusted Data Deserialization Vulnerability Allowing Arbitrary File Upload and Script Execution

A vulnerability allowing untrusted data deserialization has been identified in a-blog CMS. This issue is present in versions prior to 3.1.37 (3.1.x series), prior to 3.0.41 (3.0.x series), prior to 2.11.70 (2.11.x series), prior to 2.10.58 (2.10.x series), prior to 2.9.46 (2.9.x series), prior to 2.8.80 (2.8.x series), and in all versions of the 2.7.x series and earlier. The vulnerability can be exploited by processing a specially crafted request, which may result in the storage of arbitrary files on the server. This could be leveraged to execute arbitrary scripts on the server.

Impact

Exploitation of this vulnerability allows for arbitrary file uploads, which can be used to execute malicious scripts on the server.

Remediation

Users are advised to update a-blog CMS to the latest version. For versions 2.7.x and below, which are no longer supported, an update to version 2.8 or higher is recommended. After updating, it is important to delete any files that may have been uploaded as a result of the vulnerability. Instructions for this can be found on the a-blog CMS developer site.