Rule Document 1:67375

Rule Category

SERVER-WEBAPP -- Snort has detected traffic exploiting vulnerabilities in web based applications on servers.

Alert Message

SERVER-WEBAPP PHP PHPSESSID memory leak attempt

Rule Explanation

This rule detects PHP responses containing two consecutive URL-encoded null bytes in the PHPSESSID cookie value. This pattern may indicate that a user-space memory address has been disclosed. Such disclosures can help attackers bypass address space layout randomization (ASLR) and facilitate further exploitation.

What To Look For

This rule fires on a possible disclosure of server memory through a PHP session cookie.

Known Usage

No public information

False Positives

No known false positives

Contributors

Cisco Talos Intelligence Group

Rule Groups

Rule Categories::Server::Web Applications

MITRE::ATT&CK Framework::Enterprise::Initial Access::Exploit Public-Facing Application

Adversaries may attempt to take advantage of a weakness in an Internet-facing computer or program using software, data, or commands in order to cause unintended or unanticipated behavior. The weakness in the system can be a bug, a glitch, or a design vulnerability. These applications are often websites, but can include databases (like SQL), standard services (like SMB or SSH), network device administration and management protocols (like SNMP and Smart Install), and any other applications with Internet accessible open sockets, such as web servers and related services.

CVE

CVE-2026-109618 CVE-2026-109619

Rule Vulnerability

Information Leak

Information Leakage happens when an attacker manipulates a system into revealing sensitive information, either through malformed input or by taking advantage of another feature of the system.

CVE Additional Information

This product uses data from the NVD API but is not endorsed or certified by the NVD.

CVE-2026-109618

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CVE-2026-109619

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