CVE-2013-10051: instantcms Code Injection — Exploit

Description

A remote PHP code execution vulnerability exists in InstantCMS version 1.6 and earlier due to unsafe use of eval() within the search view handler. Specifically, user-supplied input passed via the look parameter is concatenated into a PHP expression and executed without proper sanitation. A remote attacker can exploit this flaw by sending a crafted HTTP GET request with a base64-encoded payload in the Cmd header, resulting in arbitrary PHP code execution within the context of the web server.

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CVSS v3.1 Score

9.8

CRITICAL

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Weakness Type (CWE)

CWE-95 CWE-95

Affected Products

Vendor	Product	Versions
instantcms	instantcms	< 1.6.0

References

Exploits

https://www.exploit-db.com/exploits/26622 https://www.exploit-db.com/exploits/26622

Other References

https://packetstorm.news/files/id/122176 https://raw.githubusercontent.com/rapid7/metasploit-framework/master/modules/exploits/unix/webapp/instantcms_exec.rb https://www.vulncheck.com/advisories/instantcms-remote-php-code-execution

Frequently Asked Questions

What is CVE-2013-10051? +

A remote PHP code execution vulnerability exists in InstantCMS version 1.6 and earlier due to unsafe use of eval() within the search view handler. Specifically, user-supplied input passed via the look parameter is concatenated into a PHP expression and executed without proper sanitation. A remote attacker can exploit this flaw by sending a crafted HTTP GET request with a base64-encoded payload in the Cmd header, resulting in arbitrary PHP code execution within the context of the web server. It has a CVSS v3.1 base score of 9.8 (CRITICAL).

How severe is CVE-2013-10051? +

CVE-2013-10051 has a CVSS v3.1 score of 9.8 out of 10, rated CRITICAL. This is a critical vulnerability that should be patched immediately.

What products are affected by CVE-2013-10051? +

CVE-2013-10051 affects products from instantcms, specifically: instantcms. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2013-10051? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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