Deserialization of Untrusted Data in Sassy Social Share plugin for WordPress

1) Deserialization of Untrusted Data

EUVDB-ID: #VU58266

Risk: Medium

CVSSv3.1: 7.7 [CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-39321

CWE-ID: CWE-502 - Deserialization of Untrusted Data

Exploit availability: No

Description

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

The vulnerability exists due to insecure input validation when processing serialized data in the "import_config" function in the ~/admin/class-sassy-social-share-admin.php file. A remote authenticated attacker can pass specially crafted data to the application and execute arbitrary code on the target system.

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

Mitigation

Install updates from vendor's website.

Vulnerable software versions

WordPress Social Sharing Plugin – Sassy Social Share: 1.0.0 - 3.3.23

External links

http://www.wordfence.com/blog/2021/10/vulnerability-patched-in-sassy-social-share-plugin/
http://www.wordfence.com/vulnerability-advisories/#CVE-2021-39321
http://plugins.trac.wordpress.org/changeset/2600464/sassy-social-share/trunk/admin/class-sassy-social-share-admin.php

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.