Oracle JavaServer Faces multiple vulnerabilities

Description

Oracle JavaServer Faces (JSF) 2.x contains multiple security vulnerabilities that expose applications to information disclosure attacks. The primary issues include two partial directory traversal vulnerabilities (CWE-22) that allow attackers to access files within the application's resource directories through manipulation of resource identifiers and library names. While these traversal vulnerabilities are limited to the application scope and cannot access arbitrary server files, they can expose sensitive application resources. Additional weaknesses include incorrect documentation of encryption context parameters (CWE-705) and a timing attack vulnerability in ViewState HMAC verification (CWE-367) that could potentially be exploited to bypass integrity checks.

Remediation

Apply the security patches provided in the Oracle Critical Patch Update Advisory - October 2013 immediately. Follow these steps to remediate:

1. Update Oracle JavaServer Faces: Upgrade to a patched version of JSF 2.x that addresses CVE-2013-3827 as specified in the October 2013 CPU.
2. Verify Patch Installation: After applying updates, confirm the patch version by checking your JSF library version and reviewing Oracle's patch verification procedures.
3. Review Resource Access Controls: Audit your application's resource handling configuration to ensure sensitive files are not accessible through public-facing resource handlers, even after patching.
4. Implement Defense in Depth: Configure web application firewalls or servlet filters to detect and block directory traversal patterns in resource requests (e.g., requests containing "../", encoded path separators, or unusual resource paths).
5. Monitor for Exploitation Attempts: Review application logs for suspicious resource access patterns or repeated failed resource requests that may indicate exploitation attempts.

References

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