Primetek PrimeFaces 5.x Remote Code Execution (RCE) via Weak Encryption Flaw (CVE-2017-1000486)
Executive & SecOps Summary
SECOPS ASSESSMENTJava web applications utilizing Primetek PrimeFaces framework version 5.x and below
Unauthenticated remote attackers can exploit weak encryption keys to inject arbitrary serialized objects, leading to Remote Code Execution (RCE) on the target server
Upgrade PrimeFaces to a secure version (6.0 or higher) and configure a strong, unique custom secret key in web.xml
Affected Products & Version Scope
Remediation & Live Workaround Commands
PATCH & WORKAROUND1. Official Patch & Version Upgrade Commands
The recommended remediation is to upgrade the PrimeFaces dependency to version 6.0 or higher. For Maven-based projects, update your pom.xml as follows:
<!-- Update dependency in pom.xml -->
<dependency>
<groupId>org.primefaces</groupId>
<artifactId>primefaces</artifactId>
<version>6.2</version> <!-- Or latest stable version -->
</dependency>2. Temporary Workaround & Hardening Configuration
If an immediate upgrade is not feasible, you must override the default weak encryption key by defining a strong, unique secret key in your application's web.xml:
<!-- Hardening configuration in web.xml -->
<context-param>
<param-name>primefaces.SECRET</param-name>
<param-value>YourSuperSecretSecureKey32BytesLong!</param-value>
</context-param>
<context-param>
<param-name>primefaces.UPLOADER</param-name>
<param-value>commons</param-value>
</context-param>3. Log Audit & IoC Verification Commands
Inspect your web server access logs for suspicious requests targeting the PrimeFaces dynamic resource handler containing unusually long or encoded parameters. Use the following command to search for potential exploitation attempts:
# Search access logs for suspicious PrimeFaces dynamic content requests
grep -E 'dynamiccontent\.properties.*pfdrid' /var/log/nginx/access.log /var/log/apache2/access.log 2>/dev/nullBlock Exploits Instantly with Managed Virtual Patching Rules
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Technical Root Cause & Exploitation Mechanics
1. Vulnerability Overview & Root Cause
This vulnerability (CVE-2017-1000486) is a critical Remote Code Execution (RCE) flaw in Primetek PrimeFaces 5.x. PrimeFaces uses encryption to protect sensitive parameters and state information (such as ViewState or dynamic resource parameters) passed to the client. However, the framework relies on a weak encryption algorithm (DES) and utilizes a hardcoded or easily predictable default secret key. This allows attackers to decrypt, manipulate, and re-encrypt arbitrary payloads.
2. Exploitation Mechanics & Attack Scenario
PrimeFaces handles dynamic resources via endpoints like p:fileUpload or p:media by decrypting parameters received from the client. An attacker can leverage the known default DES key (e.g., derived from the string 'primefaces') to encrypt a malicious Java serialized object payload (such as a CommonsCollections gadget chain). When this crafted payload is sent to the server, the application decrypts it using the default key and proceeds to deserialize it, triggering arbitrary OS command execution under the context of the application server.
3. Infrastructure & Business Impact
With a CVSS score of 9.8 (Critical) and its inclusion in the CISA KEV (Known Exploited Vulnerabilities) catalog, this flaw poses an immediate threat. Successful exploitation grants unauthenticated attackers full control over the underlying application server. This can lead to lateral movement within the internal network, database compromise, ransomware deployment, and severe business disruption.
Official Vendor Advisories & References
Primetek Primefaces 5.x is vulnerable to a weak encryption flaw resulting in remote code execution
Frequently Asked SecOps Questions (CVE-2017-1000486)
FAQQ1. How critical is CVE-2017-1000486 and is it actively exploited in the wild?
CVE-2017-1000486 is rated CVSS 9.8 (CRITICAL) with a 30-day EPSS exploitation probability of 94.1%. It is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, requiring immediate emergency remediation.
Q2. Which vendors and products are affected by CVE-2017-1000486?
Primary impacted vendors include primetek across primefaces. Scope summary: All Primetek PrimeFaces 5.x versions (5.0 through 5.3) configured with default encryption settings
Q3. What temporary mitigations or workarounds exist for CVE-2017-1000486 before patching?
[Mitigation] Upgrade PrimeFaces to a secure version (6.0 or higher) and configure a strong, unique custom secret key in web.xml Follow the CLI remediation commands and interactive SecOps checklist on this page to restrict exposure prior to your maintenance window.
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