CVE-2024-31903 Overview
CVE-2024-31903 is a deserialization of untrusted data vulnerability affecting IBM Sterling B2B Integrator Standard Edition. The flaw allows an attacker on the adjacent network to execute arbitrary code on the target system. IBM Sterling B2B Integrator versions 6.0.0.0 through 6.1.2.5 and 6.2.0.0 through 6.2.0.2 are affected. The weakness is categorized under CWE-502: Deserialization of Untrusted Data.
Critical Impact
Successful exploitation grants arbitrary code execution on the Sterling B2B Integrator host, compromising confidentiality, integrity, and availability of business-to-business transaction data.
Affected Products
- IBM Sterling B2B Integrator Standard Edition 6.0.0.0 through 6.1.2.5
- IBM Sterling B2B Integrator Standard Edition 6.2.0.0 through 6.2.0.2
- Deployments exposing Sterling B2B Integrator services on internal networks
Discovery Timeline
- 2025-01-22 - CVE-2024-31903 published to NVD
- 2026-06-17 - Last updated in NVD database
Technical Details for CVE-2024-31903
Vulnerability Analysis
CVE-2024-31903 stems from insecure deserialization inside IBM Sterling B2B Integrator. The application accepts serialized Java objects from adjacent network sources without validating their type or contents. When the runtime reconstructs these objects, attacker-controlled gadget chains execute code within the Sterling B2B Integrator process context.
Sterling B2B Integrator handles high-value electronic data interchange (EDI) traffic between enterprises and partners. Compromise of the platform exposes trading partner credentials, financial documents, and integration workflows. The vulnerability requires no authentication and no user interaction, lowering the bar for exploitation once an attacker has a foothold on the local segment.
Root Cause
The root cause is unsafe Java deserialization. Sterling B2B Integrator invokes ObjectInputStream.readObject() on data received from network callers without applying a look-ahead filter or serialization allow list. Any class present on the application classpath — including known gadget classes from bundled dependencies — becomes a candidate for exploitation.
Attack Vector
The attack vector is adjacent network, meaning the attacker must reach the Sterling B2B Integrator listener from the same logical network. An attacker crafts a serialized payload embedding a gadget chain that terminates in a Runtime.exec or equivalent sink. The payload is delivered to an exposed Sterling B2B Integrator endpoint that performs deserialization. Upon reconstruction, the chain runs commands under the service account, yielding arbitrary code execution. Refer to the IBM Support Document for vendor-supplied technical context.
Detection Methods for CVE-2024-31903
Indicators of Compromise
- Unexpected child processes spawned by the Sterling B2B Integrator Java process, such as shells, cmd.exe, powershell.exe, or bash
- Inbound connections to Sterling B2B Integrator service ports from workstations or subnets that do not typically initiate B2B traffic
- New or modified files under Sterling B2B Integrator installation directories, especially JSP or class files placed after the initial deployment
- Outbound network callbacks from the Sterling B2B Integrator host to unknown external IP addresses following inbound traffic bursts
Detection Strategies
- Monitor Java process lineage for java spawning interactive shells or scripting interpreters, a strong signal of deserialization gadget execution
- Inspect network captures for serialized Java magic bytes (AC ED 00 05) on Sterling B2B Integrator listeners originating from non-partner hosts
- Correlate authentication logs with process creation events to identify unauthenticated code execution patterns
Monitoring Recommendations
- Enable verbose logging on Sterling B2B Integrator adapters and forward logs to a centralized SIEM for correlation
- Baseline expected trading partner source IPs and alert on deserialization traffic from outside the allow list
- Track file integrity on the Sterling B2B Integrator installation path and configuration directories
How to Mitigate CVE-2024-31903
Immediate Actions Required
- Apply the IBM-provided fix pack referenced in the IBM Support Document to all affected Sterling B2B Integrator instances
- Restrict network access to Sterling B2B Integrator listeners so only trusted management hosts and partner gateways can connect
- Audit the Sterling B2B Integrator host for signs of prior exploitation, focusing on process ancestry and file changes
Patch Information
IBM has published remediation guidance and fix versions in the vendor advisory. Upgrade Sterling B2B Integrator to a release beyond 6.1.2.5 for the 6.1.x branch or beyond 6.2.0.2 for the 6.2.x branch as directed by IBM. Consult the IBM Support Document for exact fix pack identifiers and installation prerequisites.
Workarounds
- Segment Sterling B2B Integrator into a dedicated network zone with strict ingress controls limited to known partner ranges
- Terminate B2B traffic at an application-aware proxy that can inspect and block serialized Java payloads before they reach the integrator
- Run the Sterling B2B Integrator service under a least-privilege account to reduce the impact of successful code execution
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
