CVE-2021-24137

Blog2Social: Social Media Auto Post & Scheduler <= 6.3.0 - Authenticated SQL Injection

2020-05-29 00:00

Strategic Overview

Status: Patched in 6.3.1
Affected Plugin: Blog2Social: Social Media Auto Post & Scheduler
Affected Version: <= 6.3.0
CVSS: 8.8High
Weakness type: CWE-89 · Improper Neutralization of Special Elements used in an SQL Command ('SQL Injection')
CVE: CVE-2021-24137

View all Blog2Social: Social Media Auto Post & Scheduler vulnerabilities

At a glance

CVE-2021-24137 is a high-severity Improper Neutralization of Special Elements used in an SQL Command ('SQL Injection') vulnerability in the Blog2Social WordPress plugin, affecting versions <= 6.3.0. It carries a CVSS score of 8.8 (reachable over the network; low attack complexity; high confidentiality, integrity, availability impact). Exploitation requires an authenticated account. The issue is fixed in version 6.3.1; sites on affected versions should update now. Disclosed May 2020, reported by Nguyen Anh Tien.

Vulnerability Overview

Unvalidated input in the Blog2Social WordPress plugin, versions before 6.3.1, lead to SQL Injection in the Re-Share Posts feature, allowing authenticated users to inject arbitrary SQL commands.

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 interaction from a victim user. A successful exploit has high impact on confidentiality, integrity, availability — full site compromise territory.

CWE-89: Improper Neutralization of Special Elements used in an SQL Command ('SQL Injection')

Reaching this weakness in Blog2Social <= 6.3.0 takes any authenticated account. SQL injection happens when request data is concatenated into a query instead of being bound as a parameter, letting an attacker change the structure of the statement rather than just its values.

A working injection can read any table the database user can see, which on a WordPress install means user records, password hashes and session or API secrets stored in options. For Blog2Social the fix is 6.3.1: builds <= 6.3.0 are affected, anything from 6.3.1 onward is not.

Remediation

Update to version 6.3.1, or a newer patched version

How does WordSec protect against this?

The attempt arrives as an ordinary request to Blog2Social: WordSec's web application firewall inspects request payloads before WordPress loads them. None of that substitutes for the fix: Blog2Social 6.3.1 closes this, and updating the plugin is the step that ends it.

Firewall
Alerts

External References

https://www.cve.org/CVERecord?id=CVE-2021-24137 https://www.wordfence.com/threat-intel/vulnerabilities/id/2812b31d-11c0-4efe-95e2-ea713293dad1 https://nvd.nist.gov/vuln/detail/CVE-2021-24137

Related records

Same weakness class

Other vulnerabilities in Blog2Social: Social Media Auto Post & Scheduler

CVSS Vector

8.8

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Base

Attack VectorNetwork
Attack ComplexityLow
Privileges RequiredLow
User InteractionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh

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