IPS Community Suite versions 4.5.4.2 and below suffer from a PHP code injection vulnerability. The vulnerability exists because the IPScmsmodulesfrontpages_builder::previewBlock() method allows to pass arbitrary content to the IPS_Theme::runProcessFunction() method, which will be used in a call to the eval() PHP function. This can be exploited to inject and execute arbitrary PHP code. Successful exploitation of this vulnerability requires an account with permission to manage the sidebar (such as a Moderator or Administrator) and the “cms” application to be enabled.
advisories | CVE-2021-32924
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IPS Community Suite <= 4.5.4.2 (previewBlock) PHP Code Injection
Vulnerability
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[-] Software Link:
https://invisioncommunity.com
[-] Affected Versions:
Version 4.5.4.2 and prior versions.
[-] Vulnerability Description:
The vulnerability exists because the
IPScmsmodulesfrontpages_builder::previewBlock() method allows to
pass arbitrary content to the IPS_Theme::runProcessFunction() method,
which will be used in a call to the eval() PHP function. This can be
exploited to inject and execute arbitrary PHP code. Successful
exploitation of this vulnerability requires an account with permission
to manage the sidebar (such as a Moderator or Administrator) and the
"cms" application to be enabled.
[-] Proof of Concept:
http://[host]/[ips]/index.php?app=cms&module=pages&controller=builder&do=previewBlock&block_plugin=stats&block_template_use_how=copy&block_plugin_app=core&_sending=block_content&block_content=RCE%0ACONTENT;}}phpinfo();die;/*
[-] Solution:
Apply the vendor patch or upgrade to version 4.6.0 or later.
[-] Disclosure Timeline:
[02/02/2021] - Vendor notified through HackerOne
[02/04/2021] - Asked for an update
[06/04/2021] - Vendor replies they already released a targeted patch
[13/05/2021] - CVE number assigned
[28/05/2021] - Public disclosure
[-] CVE Reference:
The Common Vulnerabilities and Exposures project (cve.mitre.org)
has assigned the name CVE-2021-32924 to this vulnerability.
[-] Credits:
Vulnerability discovered by Egidio Romano.
[-] Other References:
https://hackerone.com/reports/1092574
[-] Original Advisory:
http://karmainsecurity.com/KIS-2021-04
