e107 is a content management system (CMS). Prior to 2.3.7, install.php decodes the attacker-controlled previous_steps POST parameter and passes it to unserialize() at file scope and again in the e_install constructor without restricting allowed classes. The installer remains accessible after a normal installation, and a crafted object graph using the bundled GuzzleHttp\Psr7\PumpStream class can flow through paths.hash into site_path, where string coercion invokes an attacker-controlled callable.
An unauthenticated attacker who can reach install.php can therefore execute arbitrary PHP functions with the web server process's privileges, leading to full server compromise. This issue is fixed in version 2.3.7.
Attack Parameters
Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Privileges Required
None
No privileges needed
User Interaction
None
No user interaction needed
Impact Assessment
Confidentiality
High
Complete data leak
Integrity
High
Complete data modification
Availability
High
Complete denial of service
CVSS Vector v3.1
Weakness Type (CWE)
References 4
https://github.com/e107inc/e107/commit/5d6d649e8cf01854d6024d07997c2449fdd75f24
security-advisories@github.com
https://github.com/e107inc/e107/commit/6c404295213952aedb9b3689be19dd4c7ba550b0
security-advisories@github.com
https://github.com/e107inc/e107/releases/tag/v2.3.7
security-advisories@github.com
https://github.com/e107inc/e107/security/advisories/GHSA-c8h6-wpj3-4cr8
security-advisories@github.com