CVE-2023-50315 Overview
CVE-2023-50315 affects IBM WebSphere Application Server versions 8.5 and 9.0. The vulnerability allows a network-positioned attacker to conduct spoofing attacks by presenting a certificate issued by a trusted authority. Successful exploitation can lead to disclosure of sensitive information transmitted by the application server. IBM tracks the issue internally as X-Force ID 274714. The flaw is classified under CWE-295 (Improper Certificate Validation).
Critical Impact
An attacker with network access can leverage improper certificate validation to spoof trusted endpoints and intercept sensitive data exchanged with WebSphere Application Server.
Affected Products
- IBM WebSphere Application Server 8.5
- IBM WebSphere Application Server 9.0
- Deployments using TLS connections relying on default certificate validation behavior
Discovery Timeline
- 2024-08-14 - CVE-2023-50315 published to NVD
- 2024-09-11 - Last updated in NVD database
Technical Details for CVE-2023-50315
Vulnerability Analysis
The vulnerability resides in how IBM WebSphere Application Server validates X.509 certificates during TLS handshake operations. The server accepts certificates issued by a trusted certificate authority without sufficiently verifying that the certificate is bound to the expected endpoint identity. This validation gap enables certificate-based spoofing.
An attacker positioned on the network path can present a valid certificate issued by a trusted CA and impersonate a legitimate service. The application server treats the connection as trusted and may transmit sensitive data to the attacker-controlled endpoint. The vulnerability is categorized as Improper Certificate Validation [CWE-295].
Exploitation requires the attacker to obtain a certificate from a trusted authority and achieve a network position capable of intercepting or redirecting WebSphere traffic. While attack complexity is high, the impact on confidentiality is significant because intercepted traffic may include credentials, session tokens, or application data.
Root Cause
The root cause is insufficient validation of certificate identity attributes such as subject or subject alternative name fields during TLS connection establishment. Trust in the issuing CA alone is treated as sufficient, allowing any valid CA-issued certificate to be accepted for connections where stricter endpoint binding should be enforced.
Attack Vector
The attack vector is network-based and does not require authentication or user interaction. An attacker must intercept or proxy WebSphere TLS traffic, typically through DNS poisoning, ARP spoofing, BGP hijacking, or compromise of an upstream network device. The attacker then presents a CA-signed certificate to the WebSphere client or server-to-server connection. Because the certificate chains to a trusted root, the connection proceeds and sensitive information is exposed.
No verified public proof-of-concept code is available for this issue. Technical details are documented in the IBM X-Force Vulnerability Report and the IBM Support Page Update.
Detection Methods for CVE-2023-50315
Indicators of Compromise
- Unexpected TLS sessions to WebSphere Application Server endpoints from non-approved network paths or IP ranges.
- Certificates presented during WebSphere TLS handshakes that chain to trusted CAs but contain unfamiliar subject or SAN values.
- Anomalous DNS responses resolving WebSphere service hostnames to unexpected addresses.
Detection Strategies
- Inspect TLS handshake logs from WebSphere and surrounding proxies for certificate subject and SAN mismatches against an approved allow-list.
- Enable certificate pinning or hostname verification logging on services that integrate with WebSphere endpoints.
- Correlate network flow telemetry with WebSphere access logs to identify connections originating from unexpected sources.
Monitoring Recommendations
- Forward WebSphere SSL trace and SystemOut.log events to a centralized SIEM for continuous review.
- Monitor outbound connections from WebSphere nodes for deviations from documented integration endpoints.
- Track changes to the WebSphere truststore and cacerts files to identify unauthorized CA additions.
How to Mitigate CVE-2023-50315
Immediate Actions Required
- Apply the fixes referenced in the IBM Support Page Update for WebSphere Application Server 8.5 and 9.0.
- Audit the WebSphere truststore and remove certificate authorities that are not required for business operations.
- Enforce hostname verification on all outbound TLS connections initiated by WebSphere applications.
Patch Information
IBM has issued security guidance and remediation for affected WebSphere Application Server 8.5 and 9.0 releases. Administrators should review the vendor advisory and apply the recommended interim fix or fix pack version listed on the IBM support page. Verify that the patched version is reflected in WAS_HOME/properties/version after deployment and that all server profiles have been restarted.
Workarounds
- Restrict network access to WebSphere management and application ports using firewall rules or network segmentation.
- Configure WebSphere to use a dedicated internal CA for service-to-service authentication rather than relying on public trust anchors.
- Enable certificate pinning at the application layer for integrations that handle sensitive data.
# Configuration example: verify installed WebSphere version after patching
cd $WAS_HOME/bin
./versionInfo.sh | grep -E "Version|Installed Product"
# Review configured truststore entries
keytool -list -keystore $WAS_HOME/profiles/<profile>/config/cells/<cell>/trust.p12 \
-storetype PKCS12 -storepass <password>
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
