CVE-2025-1759: IBM Concert Information Disclosure Flaw

CVE-2025-1759 Overview

CVE-2025-1759 is an information disclosure vulnerability affecting IBM Concert Software versions 1.0.0 through 1.1.0. The flaw stems from improper clearing of heap memory, allowing a remote attacker to obtain sensitive information from allocated memory regions. IBM published the advisory on August 18, 2025.

The weakness maps to [CWE-244] (Improper Clearing of Heap Memory Before Release) and [CWE-212] (Improper Removal of Sensitive Information Before Storage or Transfer). The attack requires no authentication or user interaction and is exploitable across the network.

Critical Impact

Remote unauthenticated attackers can read residual sensitive data from heap memory in IBM Concert deployments, exposing credentials, tokens, or application secrets.

Affected Products

• IBM Concert Software 1.0.0
• IBM Concert Software 1.0.1 through 1.0.5
• IBM Concert Software 1.1.0

Discovery Timeline

• 2025-08-18 - CVE-2025-1759 published to NVD
• 2025-08-21 - Last updated in NVD database

Technical Details for CVE-2025-1759

Vulnerability Analysis

IBM Concert Software fails to clear sensitive content from heap-allocated buffers before those buffers are released or reused. When the application later allocates memory for unrelated operations, residual data from prior contexts persists in the returned heap regions. An attacker who can trigger memory allocations and observe responses can extract this leftover data through the network interface.

The vulnerability falls under information disclosure rather than memory corruption. The integrity and availability of the application remain intact, but confidentiality is fully compromised because heap regions may contain authentication material, session tokens, or user data processed by previous requests.

Root Cause

The root cause is the absence of explicit zeroization of heap buffers before deallocation. Languages and runtimes that rely on garbage collection or standard free() semantics do not scrub memory contents by default. Sensitive values written into these buffers remain readable until overwritten by subsequent allocations, violating the [CWE-212] requirement to remove sensitive data before transfer.

Attack Vector

A remote attacker sends crafted requests to the Concert Software network endpoints to trigger allocation patterns that return previously used heap regions. Response payloads or error messages may then include uninitialized bytes containing residual sensitive content. No privileges or user interaction are required, and the attack complexity is low.

The vulnerability mechanism is described in IBM's advisory. See the IBM Support Page for technical specifics. No public proof-of-concept exploit is currently available, and the EPSS forecast indicates a low probability of exploitation.

Detection Methods for CVE-2025-1759

Indicators of Compromise

• Unexpected fragments of binary or text data appearing in IBM Concert API responses where structured fields are expected.
• Anomalous response sizes from Concert endpoints, particularly responses larger than the documented schema permits.
• Repeated identical requests from a single source returning differing response payloads, indicating memory contents shifting between allocations.

Detection Strategies

• Inspect HTTP response bodies from Concert services for non-printable bytes, padding artifacts, or structured data that does not match the API contract.
• Correlate inbound request volume with response entropy to flag scraping patterns consistent with memory disclosure probing.
• Apply network IDS rules that monitor Concert service ports for high-frequency, low-variation request patterns from single source IPs.

Monitoring Recommendations

• Enable verbose application logging on IBM Concert and forward logs to a centralized SIEM for analysis.
• Track authentication anomalies that may indicate use of credentials harvested through memory disclosure.
• Audit Concert service network traffic baselines and alert on deviations in request-response size distributions.

How to Mitigate CVE-2025-1759

Immediate Actions Required

• Identify all IBM Concert Software deployments running versions 1.0.0 through 1.1.0 and prioritize them for patching.
• Apply the fix referenced in the IBM advisory as soon as possible.
• Rotate any credentials, API keys, or tokens that may have been processed by affected Concert instances.

Patch Information

IBM has published remediation guidance on the IBM Support Page for CVE-2025-1759. Administrators should follow the vendor's instructions to upgrade to the fixed release of IBM Concert Software.

Workarounds

• Restrict network exposure of Concert Software endpoints to trusted management networks until patching is complete.
• Place a reverse proxy or web application firewall in front of Concert services to inspect and normalize response payloads.
• Limit the scope of credentials and secrets handled by Concert to reduce the value of any data exposed via heap residue.

# Example: restrict access to IBM Concert service via host firewall
sudo iptables -A INPUT -p tcp --dport 443 -s 10.0.0.0/8 -j ACCEPT
sudo iptables -A INPUT -p tcp --dport 443 -j DROP