Vulnerability in e107inc e107

[ Why it matters ]Priority signals

• Public proof-of-concept exploit exists (CISA SSVC)
• Critical severity: CVSS 9.8

[ Description ]Official description

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.

[ Fixes ]Fixes and patches

No fix or interim patch is linked from our sources yet. Check the vendor references below and limit exposure of affected systems until a fix is available.

[ References ]References

• github.com/e107inc/e107/commit/5d6d649e8cf01854d6024d07997c2449fdd75f24
• github.com/e107inc/e107/commit/6c404295213952aedb9b3689be19dd4c7ba550b0
• github.com/e107inc/e107/releases/tag/v2.3.7
• github.com/e107inc/e107/security/advisories/GHSA-c8h6-wpj3-4cr8