CVE-2020-35314
About
A remote code execution vulnerability in the installUpdateThemePluginAction function in index.php in WonderCMS 3.1.3, allows remote attackers to upload a custom plugin which can contain arbitrary code and obtain a webshell via the theme/plugin installer.
Rainforest analyst review
WonderCMS's installUpdateThemePluginAction lets a remote attacker feed the theme and plugin installer a malicious plugin containing arbitrary code, yielding a webshell. The vector marks it unauthenticated, so the path runs from an internet request to code execution and full control of the site.
A CMS that hands out a webshell is a total compromise: content defacement, SEO spam, cryptomining, or a pivot into the hosting environment all follow from there. Unauthenticated RCE in a recognizable CMS is precisely what broad scanning campaigns look for, and they don't discriminate between targets.
Our first questions are exposure and version: which WonderCMS instances are internet-reachable and which fall in the affected range. While patching proceeds, detection of the installer-abuse pattern and virtual patching give interim coverage, because with unauthenticated RCE the window between disclosure and opportunistic exploitation is short.
References
Related CVEs
Frequently asked questions
What is CVE-2020-35314?
A remote code execution vulnerability in the installUpdateThemePluginAction function in index.php in WonderCMS 3.1.3, allows remote attackers to upload a custom plugin which can contain arbitrary code and obtain a webshell via the theme/plugin installer.
How severe is CVE-2020-35314?
CVE-2020-35314 carries a CVSS 3.1 base score of 9.8, rated critical. On the Rainforest Risk Index — which weighs the severity alongside how easy the flaw is to reach and how broad its impact is — it scores 99 out of 100, in the critical band.
How is CVE-2020-35314 exploited?
According to the CVSS vector (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H): attack vector Network, attack complexity Low, privileges required None, user interaction None. Impact on confidentiality High, integrity High and availability High.
Which products are affected by CVE-2020-35314?
Public advisories list the following as affected: wondercms. Check the references on this page for the exact versions each vendor confirms.
How do I fix CVE-2020-35314?
Apply the fix the vendor published — the references on this page link to the primary advisories and patches. When patching can't happen right away, reduce the exposure of the affected component and watch it for exploitation attempts. Rainforest customers see this vulnerability correlated to their own assets and prioritized by real exposure, not by score alone.
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