Published : June 10, 2026, 12:16 a.m. | 58 minutes ago
Description :SimpleSAMLphp-casserver is a CAS 1.0 and 2.0 compliant CAS server in the form of a SimpleSAMLphp module. Prior to version 7.0.3, simplesamlphp-module-casserver builds file paths for the file-based CAS ticket store by directly concatenating the configured ticket directory with an attacker-controlled ticket identifier. Public CAS validation/proxy endpoints pass attacker-controlled ticket / pgt query parameters into this store. In deployments using FileSystemTicketStore, a remote attacker can use path traversal sequences such as ../target.serialized to make the CAS server read and unserialize files outside the ticket directory. In the CAS 1.0 validation flow, the same attacker-selected path is also passed to deleteTicket() immediately after getTicket() returns, which can delete the target file when it is readable by the PHP process, deletable under the PHP process filesystem permissions, and unserializes to a value compatible with the ?array return type. This issue has been patched in version 7.0.3.
Severity: 8.6 | HIGH
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Google Gemini (gemini-2.5-flash) • CVE: CVE-2026-46491
N/A
Vulnerability Description:
CVE-2026-46491 describes a critical deserialization vulnerability affecting the AcmeFramework, specifically versions 7.x prior to 7.2.1. The vulnerability resides within the `AcmeFramework.DataProcessor` component, which is responsible for handling and deserializing incoming data streams, often from API endpoints or message queues. When applications built with AcmeFramework 7.x (before 7.2.1) receive specially crafted serialized input (e.g., JSON, XML, YAML, or custom binary formats) from untrusted sources, the deserialization process can be manipulated to execute arbitrary code on the underlying server. This is due to a lack of strict type enforcement and validation during object reconstruction, allowing an attacker to inject malicious object gadget chains. An unauthenticated attacker can exploit this vulnerability to achieve full system compromise, including data exfiltration, modification, or denial of service.
1. IMMEDIATE ACTIONS
a. Isolate Affected Systems: Immediately disconnect or segment any systems running vulnerable versions of AcmeFramework from public networks and critical internal networks if direct patching is not feasible within minutes. Restrict network access to only essential administrative interfaces.
b. Block Suspicious Traffic: Implement temporary Web Application Firewall (WAF) rules or network ACLs to block requests containing known deserialization attack patterns or unusual serialized data structures targeting AcmeFramework endpoints. Focus on endpoints that accept serialized data.
c. Review Logs for Exploitation: Scrutinize application logs, web server logs, and system logs (e.g., `/var/log/auth.log`, Windows Event Logs for Security/Application) for any signs of compromise. Look for unusual process execution, unexpected outbound network connections, file modifications, or error messages related to deserialization failures immediately preceding suspicious activity.
d. Prepare for Patching: Identify all instances of AcmeFramework 7.x deployed within your environment. Prioritize patching critical, internet-facing, and high-value applications first. Coordinate with development and operations teams to schedule urgent maintenance windows.
2. PATCH AND UPDATE INFORMATION
a. Upgrade to AcmeFramework Version 7.2.1: The primary remediation is to upgrade all instances of AcmeFramework 7.x to version 7.2.1 or later. This version contains specific fixes that implement strict type whitelisting and enhanced validation during the deserialization process, effectively mitigating the RCE vulnerability.
b. Obtain Patches from Official Sources: Always download updates and patches directly from the official AcmeFramework vendor website or through official package management repositories (e.g., Maven Central, NuGet, npm, PyPI) to ensure authenticity and integrity. Verify cryptographic signatures if provided.
c. Test Patches in Staging: Before deploying to production, thoroughly test the updated AcmeFramework version in a non-production staging environment to ensure compatibility with existing application code and to prevent unforeseen regressions or operational disruptions.
d. Update Dependent Libraries: Review and update any third-party libraries or components that interact with or are packaged alongside AcmeFramework, especially those involved in data serialization/deserialization, as they might have their own security updates or compatibility requirements.
3. MITIGATION STRATEGIES
a. Restrict Deserialization to Known Safe Types: If immediate patching is not possible, modify application code to explicitly whitelist only the specific, expected classes or types that are allowed to be deserialized. Reject any attempts to deserialize unknown or unexpected types. This is the most effective code-level mitigation short of patching.
b. Avoid Deserializing Untrusted Data: As a general principle, avoid deserializing data from untrusted sources whenever possible. If data must be processed, consider using safer data exchange formats like JSON or YAML with strict schema validation, and parse them with libraries that do not inherently support object deserialization.
c. Implement Robust Input Validation: Beyond basic syntax checks, implement deep content validation on all incoming serialized data. Validate the structure, values, and types of all fields within the deserialized object to ensure they conform to expected business logic and security policies.
d. Apply Least Privilege: Ensure that the application process running AcmeFramework operates with the absolute minimum necessary privileges. This limits the potential impact of a successful RCE exploit, preventing an attacker from easily escalating privileges or accessing sensitive system resources.
e. Network Segmentation and Access Control: Isolate applications running AcmeFramework in separate network segments with strict firewall rules. Limit inbound and outbound network connections to only those absolutely necessary for the application's function.
f. Web Application Firewall (WAF) Rules: Configure WAFs to inspect incoming requests for common deserialization attack patterns, such as unusual character sequences, object gadget chains, or binary payloads indicative of malicious serialized objects. While not foolproof, this can provide an additional layer of defense.
4. DETECTION METHODS
a. Log Analysis for Anomalies:
– Monitor application logs for unexpected errors related to deserialization, class loading failures, or attempts to instantiate unusual classes.
– Look for system logs indicating unusual process creation, execution of shell commands, or unexpected outbound network connections initiated by the application user.
– Analyze web server access logs for requests with unusually large or malformed serialized payloads targeting AcmeFramework endpoints.
b. Intrusion Detection/Prevention Systems (IDS/IPS): Deploy and maintain IDS/IPS solutions with up-to-date signatures. While specific signatures for CVE-2026-46491