CVE-2020-35938

Team Showcase <= 1.22.15 - Object Injection

2020-09-17 00:00
Ram

Strategic Overview

Status
Patched in 1.22.16
Affected Plugin
Team Showcase
Affected Version
< 1.22.16
CVSS
7.5High
Weakness type
CWE-502 · Deserialization of Untrusted Data
CVE
CVE-2020-35938
View all Team Showcase vulnerabilities

At a glance

CVE-2020-35938 is a high-severity Deserialization of Untrusted Data vulnerability in the Team Showcase WordPress plugin, affecting versions < 1.22.16. It carries a CVSS score of 7.5 (reachable over the network; high confidentiality, integrity, availability impact). The issue is fixed in version 1.22.16; sites on affected versions should update now. Disclosed September 2020, reported by Ram.

Vulnerability Overview

PHP Object injection vulnerabilities in the Post Grid plugin before 2.0.73 for WordPress allow remote authenticated attackers to inject arbitrary PHP objects due to insecure unserialization of data supplied in a remotely hosted crafted payload in the source parameter via AJAX. The action must be set to post_grid_import_xml_layouts.

Technical Analysis

The vector marks this flaw as remotely reachable over the network, and no interaction from a victim user. A successful exploit has high impact on confidentiality, integrity, availability — full site compromise territory.

CWE-502: Deserialization of Untrusted Data

Reaching this weakness in Team Showcase < 1.22.16 takes a caller who can reach the endpoint. Deserialization of untrusted data means the application reconstructs objects from input a caller controls, letting the attacker choose which classes get instantiated and what their properties hold.

A workable chain turns deserialization into file writes, deletions or code execution, depending on what the loaded classes do in their magic methods. For Team Showcase the fix is 1.22.16: builds < 1.22.16 are affected, anything from 1.22.16 onward is not.

Remediation

Update to version 1.22.16, or a newer patched version

How does WordSec protect against this?

The attempt arrives as an ordinary request to Team Showcase: WordSec's web application firewall inspects request payloads before WordPress loads them. Classes like this one can leave something behind, so the staged malware scanner is the second half: it looks for dropped files and modified code rather than for the request that created them. None of that substitutes for the fix: Team Showcase 1.22.16 closes this, and updating the plugin is the step that ends it.

  • Firewall
  • Scanner
  • Alerts

External References

https://www.cve.org/CVERecord?id=CVE-2020-35938https://www.wordfence.com/threat-intel/vulnerabilities/id/1da8894c-fd19-4ea1-9c05-e519c0131061https://nvd.nist.gov/vuln/detail/CVE-2020-35938

Related records

Vulnerability data © Defiant, Inc., provided under the Wordfence Intelligence T&C