CVE-2021-24384

JoomSport – for Sports: Team & League, Football, Hockey & more <= 5.1.7 - Object Injection

2021-06-08 00:00
Bugbang

Strategic Overview

Status
Patched in 5.1.8
Affected Plugin
JoomSport – for Sports: Team & League, Football, Hockey & more
Affected Version
< 5.1.8
CVSS
9.8Critical
Weakness type
CWE-502 · Deserialization of Untrusted Data
CVE
CVE-2021-24384
View all JoomSport – for Sports: Team & League, Football, Hockey & more vulnerabilities

At a glance

CVE-2021-24384 is a critical-severity Deserialization of Untrusted Data vulnerability in the JoomSport WordPress plugin, affecting versions < 5.1.8. It carries a CVSS score of 9.8 (reachable over the network; low attack complexity; high confidentiality, integrity, availability impact). Exploitation requires no authentication. The issue is fixed in version 5.1.8; sites on affected versions should update now. Disclosed June 2021, reported by Bugbang.

Vulnerability Overview

The joomsport_md_load AJAX action of the JoomSport WordPress plugin before 5.1.8, registered for both unauthenticated and unauthenticated users, unserialised user input from the shattr POST parameter, leading to a PHP Object Injection issue. Even though the plugin does not have a suitable gadget chain to exploit this, other installed plugins could, which might lead to more severe issues such as RCE

Technical Analysis

The vector marks this flaw as remotely reachable over the network, with low attack complexity — no special timing or configuration is needed, and no privileges on the target site, 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 JoomSport < 5.1.8 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 JoomSport the fix is 5.1.8: builds < 5.1.8 are affected, anything from 5.1.8 onward is not.

Remediation

Update to version 5.1.8, or a newer patched version

How does WordSec protect against this?

The attempt arrives as an ordinary request to JoomSport: 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: JoomSport 5.1.8 closes this, and updating the plugin is the step that ends it.

  • Firewall
  • Scanner
  • Alerts

External References

https://www.cve.org/CVERecord?id=CVE-2021-24384https://www.wordfence.com/threat-intel/vulnerabilities/id/d5400ec0-383b-4ac5-9b38-44533519e44dhttps://nvd.nist.gov/vuln/detail/CVE-2021-24384

Related records

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